Catalysis Today最新文献_第5页

Electrocatalytic applications of pyrolytic carbons derived from sugarcane kraft lignin 甘蔗硫酸盐木质素热解碳的电催化应用

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-11-19 DOI: 10.1016/j.cattod.2025.115637

Izabela I. Rzeznicka , Mariusz Grabda , Alicja Klimkowicz , Hideyuki Horino , Jacek Grams , Lucas Ramos , Anuj Kumar Chandel

In this study, pyrolytic carbons derived from kraft lignin extracted from sugarcane bagasse and straw were systematically characterized to elucidate the relationship between their structure, composition, and electrocatalytic performance toward the oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline media. Elemental analysis of lignin precursors revealed that straw lignin has a higher silicate content than bagasse lignin, which, together with pyrolysis temperature, strongly influences specific surface area, defect density, and degree of graphitization. Cyclic voltammetry shows that both carbons exhibit measurable ORR activity in 1 M KOH, whereas no significant OER activity was observed. The ORR proceeds mainly through a two-electron pathway producing peroxide intermediates for carbons obtained at 550 °C, while partial graphitization at 1000 °C promotes a mixed two–four-electron process associated with enhanced conductivity and reorganization of edge defects. Straw-derived carbons obtained at 1000 °C displayed higher cathodic currents but also greater instability at anodic potentials, indicating enhanced surface reactivity yet lower corrosion resistance. Overall, sugarcane-derived lignins are shown to be versatile carbon materials. Their tunable structural features, from highly defective amorphous networks to partially graphitized domains, enable application-specific optimization favoring ORR electrocatalysis in alkaline fuel cells and metal-air batteries.

本研究对从蔗渣和秸秆中提取的硫酸盐木质素的热解碳进行了系统表征，以阐明其结构、组成及其在碱性介质中氧还原（ORR）和析氧（OER）反应中的电催化性能之间的关系。对木质素前驱体的元素分析表明，秸秆木质素的硅酸盐含量高于甘蔗渣木质素，而硅酸盐含量与热解温度对秸秆木质素的比表面积、缺陷密度和石墨化程度有较大影响。循环伏安法表明，这两种碳在1 M KOH中均表现出可测量的ORR活性，而OER活性不显著。ORR主要通过双电子途径为550 °C下获得的碳生成过氧化物中间体，而1000 °C下的部分石墨化促进了与电导率增强和边缘缺陷重组相关的混合2 - 4电子过程。在1000 °C下获得的秸秆衍生碳表现出更高的阴极电流，但在阳极电位下也表现出更大的不稳定性，表明表面反应性增强，但耐腐蚀性较低。总之，甘蔗衍生木质素是一种通用的碳材料。从高度缺陷的非晶态网络到部分石墨化域，它们的可调结构特征使碱性燃料电池和金属-空气电池中的ORR电催化具有特定的应用优化优势。

{"title":"Electrocatalytic applications of pyrolytic carbons derived from sugarcane kraft lignin","authors":"Izabela I. Rzeznicka , Mariusz Grabda , Alicja Klimkowicz , Hideyuki Horino , Jacek Grams , Lucas Ramos , Anuj Kumar Chandel","doi":"10.1016/j.cattod.2025.115637","DOIUrl":"10.1016/j.cattod.2025.115637","url":null,"abstract":"<div><div>In this study, pyrolytic carbons derived from kraft lignin extracted from sugarcane bagasse and straw were systematically characterized to elucidate the relationship between their structure, composition, and electrocatalytic performance toward the oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline media. Elemental analysis of lignin precursors revealed that straw lignin has a higher silicate content than bagasse lignin, which, together with pyrolysis temperature, strongly influences specific surface area, defect density, and degree of graphitization. Cyclic voltammetry shows that both carbons exhibit measurable ORR activity in 1 M KOH, whereas no significant OER activity was observed. The ORR proceeds mainly through a two-electron pathway producing peroxide intermediates for carbons obtained at 550 °C, while partial graphitization at 1000 °C promotes a mixed two–four-electron process associated with enhanced conductivity and reorganization of edge defects. Straw-derived carbons obtained at 1000 °C displayed higher cathodic currents but also greater instability at anodic potentials, indicating enhanced surface reactivity yet lower corrosion resistance. Overall, sugarcane-derived lignins are shown to be versatile carbon materials. Their tunable structural features, from highly defective amorphous networks to partially graphitized domains, enable application-specific optimization favoring ORR electrocatalysis in alkaline fuel cells and metal-air batteries.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"464 ","pages":"Article 115637"},"PeriodicalIF":5.3,"publicationDate":"2025-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145621486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of cobalt complex catalysts having a fourteen-membered ring structure and conventional sixteen-ones for oxygen reduction and hydrogen evolution reactions 十四元环结构钴配合物催化剂与十六元环结构钴配合物催化剂在氧还原和析氢反应中的比较

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-11-14 DOI: 10.1016/j.cattod.2025.115635

Zhiqing Feng , Soutaro Honda , Keisuke Awaya , Masato Machida , Makoto Moriya , Yuta Nabae , Junya Ohyama

Developing efficient and durable non-platinum group metal (non-PGM) catalysts is critical for advancing the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) in acidic conditions. Recently, we presented the enhanced performance of carbon supported cobalt complex catalysts with a 14-membered ring hexaazamacrocyclic ligand (Co-14MR/C) catalysts than carbon supported Co phthalocyanine (CoPc/C) catalysts having 16-membered ring (16MR) for the acidic ORR and HER in terms of catalytic activity and durability to propose Co-14MR structures as promising design basis of non-PGM catalyst. In the present study, we extend the comparative analysis to include Co tetraphenylporphyrin (CoTPP), another widely used Co-16MR complex. Although the performance of CoTPP/C catalysts surpasses those of CoPc/C catalysts, Co-14MR/C catalysts show higher activity and durability than CoTPP/C catalysts for both reactions. Therefore, it is indicated that Co-14MR/C catalysts are more effective for the ORR and HER compared to Co-16MR/C catalysts. In addition, based on structural analysis using extended X-ray absorption fine structure (EXAFS) spectroscopy, it is confirmed that the shorter Co-N bond length Co-14MR/C catalysts than Co-16MR/C catalysts is one of the key structural factors to long-term durability. These findings highlight the unique advantages of the 14MR ligand in enhancing both the activity and durability of CoN₄ electrocatalysts.

开发高效、耐用的非铂族金属（non-PGM）催化剂是推进酸性条件下氧还原反应（ORR）和析氢反应（HER）的关键。最近，我们研究了具有14元环六杂环配体的碳负载钴配合物催化剂（Co- 14mr /C）在酸性ORR和HER的催化活性和耐久性方面优于具有16元环（16MR）的碳负载Co-酞菁催化剂（CoPc/C），提出了Co- 14mr结构作为非pgm催化剂的有前途的设计基础。在本研究中，我们将比较分析扩展到Co四苯基卟啉（CoTPP），另一种广泛使用的Co- 16mr配合物。虽然CoTPP/C催化剂的性能优于CoPc/C催化剂，但Co-14MR/C催化剂在这两种反应中都表现出比CoTPP/C催化剂更高的活性和耐久性。因此，与Co-16MR/C催化剂相比，Co-14MR/C催化剂对ORR和HER更有效。此外，基于扩展x射线吸收精细结构（EXAFS）的结构分析，证实了Co-14MR/C催化剂比Co-16MR/C催化剂的Co-N键长度更短是长期耐用的关键结构因素之一。这些发现突出了14MR配体在提高CoN4电催化剂的活性和耐久性方面的独特优势。

{"title":"Comparison of cobalt complex catalysts having a fourteen-membered ring structure and conventional sixteen-ones for oxygen reduction and hydrogen evolution reactions","authors":"Zhiqing Feng , Soutaro Honda , Keisuke Awaya , Masato Machida , Makoto Moriya , Yuta Nabae , Junya Ohyama","doi":"10.1016/j.cattod.2025.115635","DOIUrl":"10.1016/j.cattod.2025.115635","url":null,"abstract":"<div><div>Developing efficient and durable non-platinum group metal (non-PGM) catalysts is critical for advancing the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) in acidic conditions. Recently, we presented the enhanced performance of carbon supported cobalt complex catalysts with a 14-membered ring hexaazamacrocyclic ligand (Co-14MR/C) catalysts than carbon supported Co phthalocyanine (CoPc/C) catalysts having 16-membered ring (16MR) for the acidic ORR and HER in terms of catalytic activity and durability to propose Co-14MR structures as promising design basis of non-PGM catalyst. In the present study, we extend the comparative analysis to include Co tetraphenylporphyrin (CoTPP), another widely used Co-16MR complex. Although the performance of CoTPP/C catalysts surpasses those of CoPc/C catalysts, Co-14MR/C catalysts show higher activity and durability than CoTPP/C catalysts for both reactions. Therefore, it is indicated that Co-14MR/C catalysts are more effective for the ORR and HER compared to Co-16MR/C catalysts. In addition, based on structural analysis using extended X-ray absorption fine structure (EXAFS) spectroscopy, it is confirmed that the shorter Co-N bond length Co-14MR/C catalysts than Co-16MR/C catalysts is one of the key structural factors to long-term durability. These findings highlight the unique advantages of the 14MR ligand in enhancing both the activity and durability of CoN<sub>4</sub> electrocatalysts.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"464 ","pages":"Article 115635"},"PeriodicalIF":5.3,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145578096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct production of propylene glycol from propylene using bifunctional Al-TS-1 用双功能Al-TS-1从丙烯直接生产丙二醇

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-11-13 DOI: 10.1016/j.cattod.2025.115634

Kwang Hyun Kim, Haneul Kim, Ja Hun Kwak

Propylene glycol (PG) is an important industrial chemical used in pharmaceuticals, cosmetics, and antifreeze. The conventional industrial process for producing PG involves a two-step procedure: the epoxidation of propylene (PP), followed by the hydrolysis of propylene oxide (PO) into PG. However, this process involves multiple separation and purification steps that are economically and energetically inefficient. Herein, we present a bifunctional Al-TS-1 catalyst for the direct synthesis of PG from PP using H₂O₂ as an oxidant under mild conditions. The catalyst features two active centers of isomorphic substituted monomeric titanium in a zeolite framework for PP epoxidation as well as Brønsted acidic aluminum sites for PO hydrolysis. Al-TS-1 efficiently facilitates epoxidation and hydrolysis with over 95 % PG selectivity from PP, higher than that of physically mixed TS-1 and ZSM-5 catalysts. However, its activity is relatively low owing to pore blocking by the produced PG. To overcome this low activity, we optimized the reaction media to acetone/H₂O, which enhanced PG dissolution from zeolite pores and increased the accessibility of propylene to the active centers in the zeolite pores. As a result, over 99 % catalytic overall activity and over 98 % PG selectivity was achieved using Al-TS-1. The direct PG production from the PP system using a bifunctional Al-TS-1 catalyst successfully demonstrates high PG selectivity and broadens its potential for efficient PG production.

丙二醇（PG）是一种重要的工业化学品，用于制药、化妆品和防冻剂。生产PG的传统工业过程包括两个步骤：丙烯（PP）的环氧化，然后是环氧丙烷（PO）的水解成PG。然而，该过程涉及多个分离和纯化步骤，在经济和能量上都效率低下。在此，我们提出了一种双功能Al-TS-1催化剂，用于在温和条件下以H2O2为氧化剂直接从PP合成PG。该催化剂的两个活性中心为沸石框架内的同形取代单体钛，用于PP环氧化；两个活性中心为Brønsted酸性铝，用于PO水解。Al-TS-1能有效促进PP的环氧化和水解，对PG的选择性超过95% %，高于物理混合的TS-1和ZSM-5催化剂。为了克服活性较低的问题，我们将反应介质优化为丙酮/水，促进了PG从沸石孔中的溶解，提高了丙烯对沸石孔中活性中心的可及性。结果表明，Al-TS-1的总催化活性达到99% %以上，PG选择性达到98% %以上。使用双功能Al-TS-1催化剂从PP系统直接生产PG成功地展示了高PG选择性，并扩大了其高效生产PG的潜力。

{"title":"Direct production of propylene glycol from propylene using bifunctional Al-TS-1","authors":"Kwang Hyun Kim, Haneul Kim, Ja Hun Kwak","doi":"10.1016/j.cattod.2025.115634","DOIUrl":"10.1016/j.cattod.2025.115634","url":null,"abstract":"<div><div>Propylene glycol (PG) is an important industrial chemical used in pharmaceuticals, cosmetics, and antifreeze. The conventional industrial process for producing PG involves a two-step procedure: the epoxidation of propylene (PP), followed by the hydrolysis of propylene oxide (PO) into PG. However, this process involves multiple separation and purification steps that are economically and energetically inefficient. Herein, we present a bifunctional Al-TS-1 catalyst for the direct synthesis of PG from PP using H<sub>2</sub>O<sub>2</sub> as an oxidant under mild conditions. The catalyst features two active centers of isomorphic substituted monomeric titanium in a zeolite framework for PP epoxidation as well as Brønsted acidic aluminum sites for PO hydrolysis. Al-TS-1 efficiently facilitates epoxidation and hydrolysis with over 95 % PG selectivity from PP, higher than that of physically mixed TS-1 and ZSM-5 catalysts. However, its activity is relatively low owing to pore blocking by the produced PG. To overcome this low activity, we optimized the reaction media to acetone/H<sub>2</sub>O, which enhanced PG dissolution from zeolite pores and increased the accessibility of propylene to the active centers in the zeolite pores. As a result, over 99 % catalytic overall activity and over 98 % PG selectivity was achieved using Al-TS-1. The direct PG production from the PP system using a bifunctional Al-TS-1 catalyst successfully demonstrates high PG selectivity and broadens its potential for efficient PG production.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"464 ","pages":"Article 115634"},"PeriodicalIF":5.3,"publicationDate":"2025-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145578097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A high-performance Fe3P/Co3V2O8 heterostructure trifunctional electrocatalyst with exceptional durability for overall water splitting 一种高性能Fe3P/Co3V2O8异质结构三功能电催化剂，具有优异的整体水分解耐久性

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-11-11 DOI: 10.1016/j.cattod.2025.115633

Zhaoxia Li , Wenjun Qin , Yong Zhang , Mianze Wei , Haotian Tang , Yuxue Mo , Zhiping Dai , Jiaoling Zhao , Haiqing Zhou , Xiaolin Wei

Alkaline water electrolysis is a promising strategy for hydrogen and oxygen production, but developing efficient non-precious metal electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) remains a significant challenge. To achieve low cost and efficient hydrogen evolution, we prepared the FeP-CoVO heterostructure using the morphological control and defect engineering and the urea oxidation is introduced to instead of OER at the anode. In 1 M KOH, the FeP-CoVO electrode requires overpotentials of 209 and 281 mV for HER and OER at current densities of 100 cm⁻², respectively. Furthermore, after OER, the micro-morphology of the catalyst are restructured and there are the transition of cobalt oxidation state and iron oxyhydroxide species reconstructed. For the urea oxidation reaction (UOR), the FeP-CoVO also demonstrates high activity (with the overpotential 1.346 V at 50 cm⁻²) and high durability. For the application of a dual-electrode electrolyzer, the low cell voltages is 1.417 V at a current density of 10 cm^-²for overall urea oxidation. For the development of water and urea electrolysis technologies, this work provides critical insights into designing efficient and low-cost non-precious metal catalysts.

碱水电解是一种很有前途的制氢和制氧方法，但开发出高效的非贵金属析氢反应（HER）和析氧反应（OER）电催化剂仍然是一个重大挑战。为了实现低成本高效的析氢，我们利用形态控制和缺陷工程技术制备了FeP-CoVO异质结构，并在阳极引入尿素氧化代替OER。在1 M KOH中，FeP-CoVO电极在电流密度为100 cm−2时，HER和OER分别需要209和281 mV的过电位。此外，经过OER后，催化剂的微观形态发生了重构，钴氧化态和铁氢氧化物形态发生了重构。对于尿素氧化反应（UOR）， FeP-CoVO也表现出高活性（在50 cm−2处过电位为1.346 V）和高耐久性。对于双电极电解槽的应用，低电池电压为1.417 V，电流密度为10 cm-²，用于尿素的整体氧化。对于水和尿素电解技术的发展，这项工作为设计高效和低成本的非贵金属催化剂提供了重要的见解。

{"title":"A high-performance Fe3P/Co3V2O8 heterostructure trifunctional electrocatalyst with exceptional durability for overall water splitting","authors":"Zhaoxia Li , Wenjun Qin , Yong Zhang , Mianze Wei , Haotian Tang , Yuxue Mo , Zhiping Dai , Jiaoling Zhao , Haiqing Zhou , Xiaolin Wei","doi":"10.1016/j.cattod.2025.115633","DOIUrl":"10.1016/j.cattod.2025.115633","url":null,"abstract":"<div><div>Alkaline water electrolysis is a promising strategy for hydrogen and oxygen production, but developing efficient non-precious metal electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) remains a significant challenge. To achieve low cost and efficient hydrogen evolution, we prepared the FeP-CoVO heterostructure using the morphological control and defect engineering and the urea oxidation is introduced to instead of OER at the anode. In 1 M KOH, the FeP-CoVO electrode requires overpotentials of 209 and 281 mV for HER and OER at current densities of 100 cm<sup>−2</sup>, respectively. Furthermore, after OER, the micro-morphology of the catalyst are restructured and there are the transition of cobalt oxidation state and iron oxyhydroxide species reconstructed. For the urea oxidation reaction (UOR), the FeP-CoVO also demonstrates high activity (with the overpotential 1.346 V at 50 cm<sup>−2</sup>) and high durability. For the application of a dual-electrode electrolyzer, the low cell voltages is 1.417 V at a current density of 10 cm<sup>-</sup>²for overall urea oxidation. For the development of water and urea electrolysis technologies, this work provides critical insights into designing efficient and low-cost non-precious metal catalysts.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"464 ","pages":"Article 115633"},"PeriodicalIF":5.3,"publicationDate":"2025-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145500399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of alkali promotion on the catalytic performance of the synergetic K/Fe3O4-Fe5C2/Al2O3 catalyst for CO2 hydrogenation to light paraffins and olefines 碱促进对K/Fe3O4-Fe5C2/Al2O3协同催化剂CO2加氢催化轻质石蜡和烯烃性能的影响

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-11-10 DOI: 10.1016/j.cattod.2025.115631

Zixuan Lin, Yasaman Ghaffari, Anik Ashirwadam, Ali Izadbakhsh, David S.A. Simakov

A series of K/α-Fe₂O₃/γ-Al₂O₃ catalysts with high specific surface area (150–300 m²/g) and various levels of alkali promotion (0–11 wt% K) were synthesized using the reverse microemulsion method. The capacity of the catalysts to transform CO₂ into light olefins and paraffins via direct hydrogenation at moderate pressures was examined. The effect of potassium loading was investigated in the 300–500 °C range at 11 bar, evaluating catalytic performance in terms of CO₂ conversion, C2+ selectivity, and space time yield (STY). Reaction tests showed that 7.8 wt% K loading provides the highest CO₂ conversion and C2+ selectivity, of 45 % and 46 %, respectively, with a space time yield of 6.5 mmol g⁻¹ h⁻¹ at 11 bar and 400 °C. The catalyst without alkali promotion provided only 24 % CO₂ conversion, 12 % C2 + selectivity, and a space time yield of 0.87 mmol g⁻¹ h⁻¹. Under reaction conditions α-Fe₂O₃ was converted to a mixture of Fe₃O₄ and χ-Fe₅C₂ nanoparticles that act synergistically to reduce and hydrogenate CO₂. Alkali promotion notably enhanced the formation of χ-Fe₅C₂, leading to higher selectivity to C2 + hydrocarbons.

采用反相微乳液法制备了高比表面积（150 ~ 300 m2/g）和不同碱促进量（0 ~ 11 wt% K）的K/α-Fe2O3/γ-Al2O3系列催化剂。考察了催化剂在中压下直接加氢将CO2转化为轻质烯烃和石蜡的能力。在300-500°C、11 bar的温度范围内考察了钾负载的影响，从CO2转化率、C2+ 选择性和时空产率（STY）三个方面评价了催化性能。反应试验表明，在11 bar和400 °C条件下，7.8 wt%的K负载可获得最高的CO2转化率和C2+ 选择性，分别为45 %和46 %，时空产率为6.5 mmol g−1 h−1。无碱促进催化剂的CO2转化率为24% %，C2 + 选择性为12 %，时空产率为0.87 mmol g−1 h−1。在反应条件下，α-Fe2O3转化为Fe3O4和χ-Fe5C2纳米粒子的混合物，并协同作用还原和氢化CO2。碱促进作用显著增强了χ-Fe5C2的生成，对C2 + 烃有较高的选择性。

{"title":"Effect of alkali promotion on the catalytic performance of the synergetic K/Fe3O4-Fe5C2/Al2O3 catalyst for CO2 hydrogenation to light paraffins and olefines","authors":"Zixuan Lin, Yasaman Ghaffari, Anik Ashirwadam, Ali Izadbakhsh, David S.A. Simakov","doi":"10.1016/j.cattod.2025.115631","DOIUrl":"10.1016/j.cattod.2025.115631","url":null,"abstract":"<div><div>A series of K/α-Fe<sub>2</sub>O<sub>3</sub>/γ-Al<sub>2</sub>O<sub>3</sub> catalysts with high specific surface area (150–300 m<sup>2</sup>/g) and various levels of alkali promotion (0–11 wt% K) were synthesized using the reverse microemulsion method. The capacity of the catalysts to transform CO<sub>2</sub> into light olefins and paraffins via direct hydrogenation at moderate pressures was examined. The effect of potassium loading was investigated in the 300–500 °C range at 11 bar, evaluating catalytic performance in terms of CO<sub>2</sub> conversion, C2+ selectivity, and space time yield (STY). Reaction tests showed that 7.8 wt% K loading provides the highest CO<sub>2</sub> conversion and C2+ selectivity, of 45 % and 46 %, respectively, with a space time yield of 6.5 mmol g<sup>−1</sup> h<sup>−1</sup> at 11 bar and 400 °C. The catalyst without alkali promotion provided only 24 % CO<sub>2</sub> conversion, 12 % C2 + selectivity, and a space time yield of 0.87 mmol g<sup>−1</sup> h<sup>−1</sup>. Under reaction conditions α-Fe<sub>2</sub>O<sub>3</sub> was converted to a mixture of Fe<sub>3</sub>O<sub>4</sub> and χ-Fe<sub>5</sub>C<sub>2</sub> nanoparticles that act synergistically to reduce and hydrogenate CO<sub>2</sub>. Alkali promotion notably enhanced the formation of χ-Fe<sub>5</sub>C<sub>2</sub>, leading to higher selectivity to C2 + hydrocarbons.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"464 ","pages":"Article 115631"},"PeriodicalIF":5.3,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145500398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tailoring the polarity of 13X zeolite with glycine for efficient capture of oxygenates from Fischer-Tropsch oil 用甘氨酸调整13X沸石的极性，以有效捕获费托油中的氧合物

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-11-10 DOI: 10.1016/j.cattod.2025.115632

Jianxin Shi , Tengfei Jiang , Yanjuan Wu , Yanxin Mao , Zhibao Yin , Xuan Wen , Liang Wang , Hao Zhang , Hongman Sun , Linhua Song , Zhuang Zhuang

Although 13X zeolite is commonly used to remove oxygenates from Fischer-Tropsch oil, it still suffers from limited adsorption selectivity. In this study, glycine was used as a modifier to functionalize 13X zeolite by grafting polar groups, and applied for the removal of oxygenates from Fischer-Tropsch oil. The results indicate that the modified zeolite exhibits a high adsorption capacity for oxygenates. Specifically, the adsorption capacity for butanol, hexanal, and 2-hexanone increased by approximately 90 %, reaching 0.60 g·g⁻¹, 0.36 g·g⁻¹, and 0.35 g·g⁻¹. The adsorption capacity for hexanol and octanol increased by approximately 50 %. The enhancement in adsorption capacity for carbonyl compounds and long-chain alcohols (such as hexanol, heptanol, and octanol) was particularly notable, with an average increase of about 80 %. Mechanistic studies revealed that the adsorption of oxygenates on the modified zeolite is primarily physical adsorption, involving hydrogen bonding interactions and van der Waals forces. The adsorption process can be divided into two stages: surface adsorption and pore diffusion, and is jointly influenced by factors such as zeolite pore size, adsorbate molecular size, and their interactions with the pore channels. This study provides a novel strategy for the removal of oxygenated compounds from Fischer-Tropsch oil.

虽然13X沸石通常用于去除费托油中的含氧物，但其吸附选择性有限。本研究以甘氨酸为改性剂，通过接枝极性基团对13X沸石进行功能化，并应用于费托油中含氧物的去除。结果表明，改性沸石对含氧物具有较高的吸附能力。具体来说，对丁醇、己醛和2-己酮的吸附量增加了约90 %，分别达到0.60 g·g−1、0.36 g·g−1和0.35 g·g−1。对己醇和辛醇的吸附量提高了约50% %。对羰基化合物和长链醇（如己醇、庚醇和辛醇）的吸附能力增强尤为显著，平均提高约80% %。机理研究表明，改性沸石对氧合物的吸附主要是物理吸附，涉及氢键相互作用和范德华力。吸附过程可分为表面吸附和孔道扩散两个阶段，并受沸石孔径大小、吸附物分子大小及其与孔道的相互作用等因素共同影响。本研究为从费托油中去除含氧化合物提供了一种新的策略。

{"title":"Tailoring the polarity of 13X zeolite with glycine for efficient capture of oxygenates from Fischer-Tropsch oil","authors":"Jianxin Shi , Tengfei Jiang , Yanjuan Wu , Yanxin Mao , Zhibao Yin , Xuan Wen , Liang Wang , Hao Zhang , Hongman Sun , Linhua Song , Zhuang Zhuang","doi":"10.1016/j.cattod.2025.115632","DOIUrl":"10.1016/j.cattod.2025.115632","url":null,"abstract":"<div><div>Although 13X zeolite is commonly used to remove oxygenates from Fischer-Tropsch oil, it still suffers from limited adsorption selectivity. In this study, glycine was used as a modifier to functionalize 13X zeolite by grafting polar groups, and applied for the removal of oxygenates from Fischer-Tropsch oil. The results indicate that the modified zeolite exhibits a high adsorption capacity for oxygenates. Specifically, the adsorption capacity for butanol, hexanal, and 2-hexanone increased by approximately 90 %, reaching 0.60 g·g<sup>−1</sup>, 0.36 g·g<sup>−1</sup>, and 0.35 g·g<sup>−1</sup>. The adsorption capacity for hexanol and octanol increased by approximately 50 %. The enhancement in adsorption capacity for carbonyl compounds and long-chain alcohols (such as hexanol, heptanol, and octanol) was particularly notable, with an average increase of about 80 %. Mechanistic studies revealed that the adsorption of oxygenates on the modified zeolite is primarily physical adsorption, involving hydrogen bonding interactions and van der Waals forces. The adsorption process can be divided into two stages: surface adsorption and pore diffusion, and is jointly influenced by factors such as zeolite pore size, adsorbate molecular size, and their interactions with the pore channels. This study provides a novel strategy for the removal of oxygenated compounds from Fischer-Tropsch oil.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"464 ","pages":"Article 115632"},"PeriodicalIF":5.3,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145578099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green hydrogen and oxygen production over IrO2/Pt/TiO2 via photocatalytic overall water splitting under visible light illumination 可见光照射下，IrO2/Pt/TiO2光催化整体水分解制备绿色氢氧

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-10-31 DOI: 10.1016/j.cattod.2025.115621

Laxmi Prasad Rao Pala , Nageswara Rao Peela

With the increasing demand for renewable energy and the need to reduce carbon emissions, the development of efficient material for photocatalytic overall water splitting (POWS) has become a subject of significant research interest. In this context, we developed a TiO₂ semiconductor material with Pt and IrO₂ as cocatalysts for the POWS under visible/simulated light irradiation for the sustainable green hydrogen production. The 2.5IrO₂/0.5Pt/TiO₂ photocatalyst exhibited ideal POWS producing hydrogen and oxygen under the illumination of visible light (400 W Metal halide lamp) and simulated solar light (SSL). The rates of hydrogen and oxygen production were 16.7 and 8.5 µmol g⁻¹ h⁻¹ under visible light illumination, and 9.73 and 5.32 µmol g⁻¹ h⁻¹ under SSL illumination, at the similar intensities of ∼100 mW cm⁻², resulting in the H₂ to O₂ ratios close to stoichiometric value of 2 for POWS.

随着可再生能源需求的增加和碳排放的减少，光催化全面水分解（POWS）高效材料的开发已成为一个重要的研究课题。在此背景下，我们开发了一种以Pt和IrO2为助催化剂的TiO2半导体材料，用于可见光/模拟光照射下POWS的可持续绿色制氢。2.5IrO2/0.5Pt/TiO2光催化剂在可见光（400 W金属卤化物灯）和模拟太阳光照（SSL）下表现出理想的产氢产氧POWS。在可见光照射下，氢气和氧气的产率分别为16.7和8.5 µmol g−1 h−1，在类似的强度为~ 100 mW cm−2的SSL照射下，氢气和氧气的产率分别为9.73和5.32 µmol g−1 h−1，导致POWS的H2 / O2比接近化学计量值2。

引用次数: 0

One-pot hydrothermal synthesis of double metal cyanide catalysts for polyol production 一锅水热合成双金属氰化多元醇催化剂

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-10-30 DOI: 10.1016/j.cattod.2025.115620

Chinh Hoang Tran , Won Seok Jae , Ngoc Thanh Truong , Nghiem Anh Tuan Le , Duy Du Bui , Il Kim

The sample surface area plays a pivotal role in influencing the catalytic activity and selectivity of double metal cyanide (DMC) catalysis. In this study, DMC catalysts with well-defined crystal structures were synthesized via precipitation, complexation, and hydrothermal methods. Notably, the hydrothermally prepared catalyst synthesized in the presence of the P123 triblock copolymer (h-DMC) exhibited a higher surface area and highly uniform hexagonal plate-like morphology, as confirmed by X-ray powder diffraction and scanning electron microscopy. The P123 template played a decisive role in forming high surface area sample by directing crystal growth and promoting morphological uniformity. The catalytic activities of the DMC samples were found to be proportional to their specific surface areas. The resulting catalysts were evaluated for the ring-opening polymerization (ROP) of propylene oxide (PO) and ε-caprolactone, as well as the copolymerization of PO with carbon dioxide, to elucidate the structure–activity relationship. The activities of DMC catalysts are proportional to their specific surface areas. Among all samples, h-DMC demonstrated the highest catalytic efficiency, achieving a turnover frequency of up to 466 min⁻¹ for the ROP of PO. Furthermore, this catalyst enabled the production of polyether and polyester polyols with controlled hydroxyl functionality and narrow dispersity, and it produced polycarbonates with high carbonate content (up to 45 %) and yield (up to 81 %).

样品的表面积对双金属氰化物（DMC）的催化活性和选择性起着举足轻重的作用。本研究通过沉淀法、络合法和水热法合成了晶体结构明确的DMC催化剂。值得注意的是，通过x射线粉末衍射和扫描电镜证实，在P123三嵌段共聚物（h-DMC）存在下合成的水热制备的催化剂具有更高的比表面积和高度均匀的六边形片状形貌。P123模板通过引导晶体生长和促进形态均匀性，在形成高比表面积样品中起决定性作用。发现DMC样品的催化活性与其比表面积成正比。考察了所制催化剂对环氧丙烷（PO）与ε-己内酯开环聚合（ROP）以及PO与二氧化碳的共聚反应的影响，阐明了催化剂的构效关系。DMC催化剂的活性与其比表面积成正比。在所有样品中，h-DMC表现出最高的催化效率，PO的ROP的周转频率高达466 min−1。此外，该催化剂使聚醚和聚酯多元醇具有可控的羟基功能和窄分散性，并生产出高碳酸盐含量（高达45 %）和收率（高达81 %）的聚碳酸酯。

{"title":"One-pot hydrothermal synthesis of double metal cyanide catalysts for polyol production","authors":"Chinh Hoang Tran , Won Seok Jae , Ngoc Thanh Truong , Nghiem Anh Tuan Le , Duy Du Bui , Il Kim","doi":"10.1016/j.cattod.2025.115620","DOIUrl":"10.1016/j.cattod.2025.115620","url":null,"abstract":"<div><div>The sample surface area plays a pivotal role in influencing the catalytic activity and selectivity of double metal cyanide (DMC) catalysis. In this study, DMC catalysts with well-defined crystal structures were synthesized via precipitation, complexation, and hydrothermal methods. Notably, the hydrothermally prepared catalyst synthesized in the presence of the P123 triblock copolymer (h-DMC) exhibited a higher surface area and highly uniform hexagonal plate-like morphology, as confirmed by X-ray powder diffraction and scanning electron microscopy. The P123 template played a decisive role in forming high surface area sample by directing crystal growth and promoting morphological uniformity. The catalytic activities of the DMC samples were found to be proportional to their specific surface areas. The resulting catalysts were evaluated for the ring-opening polymerization (ROP) of propylene oxide (PO) and ε-caprolactone, as well as the copolymerization of PO with carbon dioxide, to elucidate the structure–activity relationship. The activities of DMC catalysts are proportional to their specific surface areas. Among all samples, h-DMC demonstrated the highest catalytic efficiency, achieving a turnover frequency of up to 466 min<sup>−1</sup> for the ROP of PO. Furthermore, this catalyst enabled the production of polyether and polyester polyols with controlled hydroxyl functionality and narrow dispersity, and it produced polycarbonates with high carbonate content (up to 45 %) and yield (up to 81 %).</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"463 ","pages":"Article 115620"},"PeriodicalIF":5.3,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145413388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pt-V bimetallic catalysts for the catalytic reduction of chlorate ion pollutants in natural water Pt-V双金属催化剂催化还原天然水中氯酸盐离子污染物

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-10-28 DOI: 10.1016/j.cattod.2025.115617

A. Pla-Hernández , K. Góra-Marek , K.A. Tarach , A.E. Palomares

Pt-V bimetallic catalysts supported on alumina are studied for the chlorate hydrogenation reaction in water phase. It is observed that there is a synergic effect between Pt and V that enhances the catalytic activity. The activity of both mono and bimetallic catalysts has been studied in polluted natural water containing other ionic species together with the chlorate ion. It is observed that the monometallic catalysts are not active in these conditions as there is a competitive adsorption of the other anions present in natural water for the Pt active sites. Contrarily, Pt-V catalysts are active in natural water being able to reduce the chlorate ions of the media in presence of other ions. The materials have been characterized by different techniques observing that the addition of vanadium to the Pt-Al₂O₃ modifies the electronic properties of the platinum sites, due to a high electronic interaction of both metals. This interaction favours the formation of partially positively charged platinum nanoclusters and strength the acidity of the catalyst surface. Infrared characterization using CO as probe molecule provided selective information about the centres participating in the reaction. It is shown that there is a correlation between the intensity of the band around 2100 cm⁻¹, assigned to the interaction CO-Pt^+δ and the initial activity of the catalysts. This indicates that partially charged Pt nanoclusters are the most active sites for the chlorate reduction. The combination of the noble and the non-noble metal and their interaction with the alumina support, improves the redox and acid properties of the catalyst enhancing its activity and making possible the reduction of chlorate pollutants in natural water.

研究了氧化铝负载Pt-V双金属催化剂在水相氯酸盐加氢反应中的应用。观察到Pt和V之间存在协同作用，增强了催化活性。研究了单金属和双金属催化剂在含氯酸盐离子的污染天然水中的活性。观察到，单金属催化剂在这些条件下不具有活性，因为天然水中存在的其他阴离子对Pt活性位点的竞争性吸附。相反，Pt-V催化剂在天然水中具有活性，能够在其他离子存在的情况下还原介质中的氯酸盐离子。通过不同的技术对材料进行了表征，观察到在Pt-Al2O3中添加钒会改变铂位点的电子性质，这是由于两种金属之间的高电子相互作用。这种相互作用有利于形成部分带正电的铂纳米团簇，并增强催化剂表面的酸性。利用一氧化碳作为探针分子的红外表征提供了参与反应中心的选择性信息。结果表明，CO-Pt+δ在2100 cm−1附近的条带强度与催化剂的初始活性呈正相关。这表明部分带电Pt纳米团簇是氯酸盐还原最活跃的位点。贵金属和非贵金属的结合以及它们与氧化铝载体的相互作用，改善了催化剂的氧化还原和酸性，提高了催化剂的活性，使天然水中氯酸盐污染物的还原成为可能。

{"title":"Pt-V bimetallic catalysts for the catalytic reduction of chlorate ion pollutants in natural water","authors":"A. Pla-Hernández , K. Góra-Marek , K.A. Tarach , A.E. Palomares","doi":"10.1016/j.cattod.2025.115617","DOIUrl":"10.1016/j.cattod.2025.115617","url":null,"abstract":"<div><div>Pt-V bimetallic catalysts supported on alumina are studied for the chlorate hydrogenation reaction in water phase. It is observed that there is a synergic effect between Pt and V that enhances the catalytic activity. The activity of both mono and bimetallic catalysts has been studied in polluted natural water containing other ionic species together with the chlorate ion. It is observed that the monometallic catalysts are not active in these conditions as there is a competitive adsorption of the other anions present in natural water for the Pt active sites. Contrarily, Pt-V catalysts are active in natural water being able to reduce the chlorate ions of the media in presence of other ions. The materials have been characterized by different techniques observing that the addition of vanadium to the Pt-Al<sub>2</sub>O<sub>3</sub> modifies the electronic properties of the platinum sites, due to a high electronic interaction of both metals. This interaction favours the formation of partially positively charged platinum nanoclusters and strength the acidity of the catalyst surface. Infrared characterization using CO as probe molecule provided selective information about the centres participating in the reaction. It is shown that there is a correlation between the intensity of the band around 2100 cm<sup>−1</sup>, assigned to the interaction CO-Pt<sup>+δ</sup> and the initial activity of the catalysts. This indicates that partially charged Pt nanoclusters are the most active sites for the chlorate reduction. The combination of the noble and the non-noble metal and their interaction with the alumina support, improves the redox and acid properties of the catalyst enhancing its activity and making possible the reduction of chlorate pollutants in natural water.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"463 ","pages":"Article 115617"},"PeriodicalIF":5.3,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145413390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of preparative variables on VOx supported onto pillared and honeycomb montmorillonite for total acetone oxidation 柱状蒙脱土和蜂窝状蒙脱土负载VOx对总丙酮氧化的影响

IF 5.3 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today

Pub Date : 2025-10-28 DOI: 10.1016/j.cattod.2025.115619

Carolina De los Santos , Hilario Vidal , José Manuel Gatica , María del Pilar Yeste , Jorge Castiglioni

VOx catalysts have been widely applied in heterogeneous catalysis for decades. Their reactivity in various reactions increases when supported on a suitable solid. Montmorillonites have a great versatility to achieve improved catalytic supports, particularly pillared clays (PILCs) and honeycomb monoliths. This work aims to determine whether the type of support (powder or monolith) prepared from a clay influences the properties of VOx as active phase and which preparative variables (loading or way of incorporation) lead to a higher activity in total acetone oxidation. The catalysts were characterised by µXRF, TGA, XRD, SEM-EDS, TPR and N₂-physisorption. It was possible to prepare VOx catalysts on both powdered PILC and monolithic supports. In the case of the catalysts based on PILC, an active phase loading of 20 wt% was found to be the most favourable to achieve 90 % of total acetone oxidation at 300 ºC. For all the catalysts prepared from VOx supported on PILC, mainly V⁵⁺ was found in the active phase. In the case of the monolith-supported catalysts, the loading incorporated after two impregnation cycles was lower than 1 wt%. An acetone conversion of 90 % was achieved at 350 °C. Performing two impregnation cycles with an intermediate calcination process favoured the formation of V⁵⁺ species and their accumulation but did not improve the reactivity towards acetone oxidation. Therefore, the nature of different supports, even if they proceed from the same montmorillonite, and the preparative variables may influence the type of VOx phase formed and its catalytic activity.

几十年来，VOx催化剂在多相催化中得到了广泛的应用。在合适的固体支撑下，它们在各种反应中的反应活性会增加。蒙脱石具有很大的通用性，可以实现改进的催化载体，特别是柱状粘土（PILCs）和蜂窝巨石。这项工作旨在确定从粘土制备的载体类型（粉末或整体）是否影响VOx作为活性相的性质，以及哪种制备变量（负载或掺入方式）导致总丙酮氧化活性更高。采用µXRF、TGA、XRD、SEM-EDS、TPR和n2物理吸附对催化剂进行了表征。在粉状PILC和整体支架上制备VOx催化剂都是可能的。在基于PILC的催化剂的情况下，在300℃时，20 wt%的活性相负载最有利于实现90 %的总丙酮氧化。对于负载在PILC上的VOx制备的催化剂，活性相中主要存在V5+。在整体负载催化剂的情况下，两次浸渍循环后的负载低于1 wt%。在350 °C时，丙酮转化率为90 %。在中间焙烧过程中进行两次浸渍循环有利于V5+的形成和积累，但对丙酮氧化的反应性没有改善。因此，不同载体的性质，即使它们来自相同的蒙脱土，以及制备变量都可能影响形成的VOx相类型及其催化活性。

{"title":"Effect of preparative variables on VOx supported onto pillared and honeycomb montmorillonite for total acetone oxidation","authors":"Carolina De los Santos , Hilario Vidal , José Manuel Gatica , María del Pilar Yeste , Jorge Castiglioni","doi":"10.1016/j.cattod.2025.115619","DOIUrl":"10.1016/j.cattod.2025.115619","url":null,"abstract":"<div><div>VOx catalysts have been widely applied in heterogeneous catalysis for decades. Their reactivity in various reactions increases when supported on a suitable solid. Montmorillonites have a great versatility to achieve improved catalytic supports, particularly pillared clays (PILCs) and honeycomb monoliths. This work aims to determine whether the type of support (powder or monolith) prepared from a clay influences the properties of VOx as active phase and which preparative variables (loading or way of incorporation) lead to a higher activity in total acetone oxidation. The catalysts were characterised by µXRF, TGA, XRD, SEM-EDS, TPR and N<sub>2</sub>-physisorption. It was possible to prepare VOx catalysts on both powdered PILC and monolithic supports. In the case of the catalysts based on PILC, an active phase loading of 20 wt% was found to be the most favourable to achieve 90 % of total acetone oxidation at 300 ºC. For all the catalysts prepared from VOx supported on PILC, mainly V<sup>5+</sup> was found in the active phase. In the case of the monolith-supported catalysts, the loading incorporated after two impregnation cycles was lower than 1 wt%. An acetone conversion of 90 % was achieved at 350 °C. Performing two impregnation cycles with an intermediate calcination process favoured the formation of V<sup>5+</sup> species and their accumulation but did not improve the reactivity towards acetone oxidation. Therefore, the nature of different supports, even if they proceed from the same montmorillonite, and the preparative variables may influence the type of VOx phase formed and its catalytic activity.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"463 ","pages":"Article 115619"},"PeriodicalIF":5.3,"publicationDate":"2025-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145413386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0