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Effect of Structural Defects Induced in LaFeO3 and LaMnO3 Catalysts towards Total Oxidation of 2-Propanol
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-02-04 DOI: 10.1007/s10562-024-04913-6
Múnera-Jaramillo Jessica, Tapia-P. Juan, Gallego Jaime, Santamaría Alexander

A crucial characteristic of perovskite-like oxides is oxygen mobility, which can be enhanced by inducing structural defects through stoichiometry variations during synthesis, thereby boosting the catalytic activity. This study evaluated the effect of structural modifications of LaFeO3 (LF) and LaMnO3 (LM) perovskites series on the total oxidation of 2-propanol as a VOC model, a well-known organic solvent. These modifications were performed during synthesis by partially removing the B-site cation or by structural doping in the B-site with another cation (Mn for the LF series and Pd for the LM series). Structural characterization was carried out by XRD and Raman spectroscopy, while the bulk and surface chemical composition were assessed by ICP and XPS, respectively. On the other hand, catalytic activity was performed using a reactivity test with the 2-propanol molecule. The CO-TPR and O2-TPD measurements were used to characterize the reducibility of the active phase, and the type of oxygen species present in the sample. The catalytic activity results indicated that the modified perovskites showed a difference of 118 °C and 109 °C in the T95 parameter (Temperature at which the conversion of 2-propanol was 95%) relative to pure LF and LM perovskites, respectively. It was also observed that the inclusion of cationic species with high oxidation states enhances the catalytic properties of the materials not only for the doped perovskites but also for the impregnated ones used for comparison purposes. This research demonstrated that stoichiometric variations in modified perovskite-like catalysts significantly improve the catalytic capacity by forming structural defects and modifying redox properties.Kindly check and confirm whether the corresponding author is correctly identified.I confirm that the corresponding author is well identified

Graphical Abstract

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引用次数: 0
Effect of bias in Argon Plasma on Electronic Structure of Electrocatalyst Pt/CNT for Hydrogen Evolution Reaction
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-02-04 DOI: 10.1007/s10562-025-04944-7
Chang Liu, Yanlei Liu, Hongmei Sun, Nan Yu, Guohua Ni

Electronic structure engineering provides an effective route to enhance the mass activity and stability of Pt-based catalysts. In this paper, platinum nanoparticles supported on carbon nanotubes (Pt/CNTs) are prepared by treating the H2PtCl6/CNT precursor with argon plasma at different bias. Extensive structural characterization indicates that, compared with positive and zero bias of the substrate, negative bias causes the most defects in CNTs (ID/IG = 1.11), results in the lowest valence state of Pt, and achieves the highest Pt loading (4.9 wt%). Meanwhile, the synthesized Pt/CNTs at negative bias (Pt/CNT-V) demonstrate significant catalytic activity and exceptional stability in the hydrogen evolution reaction (HER). The Pt/CNT-V catalyst exhibits an overpotential of 45 mV at a current density of 10 mA cm− 2 and a mass activity of 3.28 A mg− 1 for the HER in 0.5 M H2SO4, surpassing the performance of commercial JM-Pt/C. The overpotential of the Pt/CNT-V catalyst only negatively shifts by 3 mV after 3000 cycles, compared to the 9 mV shift observed for JM-Pt/C. This simple method provides a new strategy for tuning the electronic properties of metals on carbon carriers.

Graphical Abstract

{"title":"Effect of bias in Argon Plasma on Electronic Structure of Electrocatalyst Pt/CNT for Hydrogen Evolution Reaction","authors":"Chang Liu,&nbsp;Yanlei Liu,&nbsp;Hongmei Sun,&nbsp;Nan Yu,&nbsp;Guohua Ni","doi":"10.1007/s10562-025-04944-7","DOIUrl":"10.1007/s10562-025-04944-7","url":null,"abstract":"<div><p>Electronic structure engineering provides an effective route to enhance the mass activity and stability of Pt-based catalysts. In this paper, platinum nanoparticles supported on carbon nanotubes (Pt/CNTs) are prepared by treating the H<sub>2</sub>PtCl<sub>6</sub>/CNT precursor with argon plasma at different bias. Extensive structural characterization indicates that, compared with positive and zero bias of the substrate, negative bias causes the most defects in CNTs (I<sub>D</sub>/I<sub>G</sub> = 1.11), results in the lowest valence state of Pt, and achieves the highest Pt loading (4.9 wt%). Meanwhile, the synthesized Pt/CNTs at negative bias (Pt/CNT-V<sub>−</sub>) demonstrate significant catalytic activity and exceptional stability in the hydrogen evolution reaction (HER). The Pt/CNT-V<sub>−</sub> catalyst exhibits an overpotential of 45 mV at a current density of 10 mA cm<sup>− 2</sup> and a mass activity of 3.28 A mg<sup>− 1</sup> for the HER in 0.5 M H<sub>2</sub>SO<sub>4</sub>, surpassing the performance of commercial JM-Pt/C. The overpotential of the Pt/CNT-V<sub>−</sub> catalyst only negatively shifts by 3 mV after 3000 cycles, compared to the 9 mV shift observed for JM-Pt/C. This simple method provides a new strategy for tuning the electronic properties of metals on carbon carriers.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 3","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Enhancing Solar Energy-Driven Photocatalytic Water Splitting Reaction Over Znln2S4 by N Doping
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-01-31 DOI: 10.1007/s10562-025-04950-9
Nasim Mia, Yulin Hu

The solar energy-driven photocatalytic H2 production from water plays a critical role in achieving decarbonization. One of the key factors determining the water splitting efficiency is the selection of highly effective and stable photocatalysts. Recently, ZnIn2S4 (ZIS) based photocatalysts have attracted a great deal of attention due to smaller bandgaps, great light harvesting ability, less toxicity, and ease of fabrication. Therefore, in this study, pristine ZIS and N-doped ZIS (N-ZIS) photocatalysts were synthesized, followed by the investigation of the water splitting reaction under different reaction conditions (e.g., photocatalyst concentration and type and dosage of sacrificial agent). Afterward, the stability of the photocatalyst and sacrificial agent was explored. The results showed that N doping enhanced the evolution of total gases via water splitting reaction. The maximum amount of total gases of 17,559 µmol/gcatalyst was produced at 5mgN − ZIS/35mlreaction medium, methanol as the sacrificial agent, 15 vol% methanol addition for 2 h reaction time. In the stability study of N-ZIS and methanol, a decrease of 6.67% and 29.03% was observed at 3rd cycle, respectively. Overall, the present work provides new insights and knowledge into photocatalytic water splitting over N doping technique for ZIS-based photocatalysts.

Graphical abstract

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引用次数: 0
Unveiling Water Adsorption Dynamics on N and Br-Modified Anatase TiO₂ (101) Surfaces: A DFT Study
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-01-31 DOI: 10.1007/s10562-025-04941-w
Asad Mahmood

Understanding water adsorption on catalyst surfaces through DFT studies is essential for uncovering interaction mechanisms and enhancing surface reactivity. Defect modulation in oxide-based semiconductors like TiO₂ is pivotal for applications in catalysis, geophysics, and biochemistry. This study uses periodic DFT calculations to investigate water adsorption on Br- and N-doped TiO₂ (101) surfaces. The results indicate that Br and N doping enhances surface reactivity, yielding higher adsorption energy of -0.873 eV for a single water molecule compared to -0.654 eV for undoped TiO₂. An increase in the number of water molecules leads to cluster formation on the modified surface, demonstrating improved adsorption capability. Moreover, Br and N dopants facilitate water dissociation, suggesting an elevated radical’s production. This study is significant as it deepens our understanding of the surface behavior of doped oxide materials, i.e., TiO2, paving the way for enhanced insights into their catalytic properties and potential applications in heterogeneous catalysis.

Graphical abstract

{"title":"Unveiling Water Adsorption Dynamics on N and Br-Modified Anatase TiO₂ (101) Surfaces: A DFT Study","authors":"Asad Mahmood","doi":"10.1007/s10562-025-04941-w","DOIUrl":"10.1007/s10562-025-04941-w","url":null,"abstract":"<div><p>Understanding water adsorption on catalyst surfaces through DFT studies is essential for uncovering interaction mechanisms and enhancing surface reactivity. Defect modulation in oxide-based semiconductors like TiO₂ is pivotal for applications in catalysis, geophysics, and biochemistry. This study uses periodic DFT calculations to investigate water adsorption on Br- and N-doped TiO₂ (101) surfaces. The results indicate that Br and N doping enhances surface reactivity, yielding higher adsorption energy of -0.873 eV for a single water molecule compared to -0.654 eV for undoped TiO₂. An increase in the number of water molecules leads to cluster formation on the modified surface, demonstrating improved adsorption capability. Moreover, Br and N dopants facilitate water dissociation, suggesting an elevated radical’s production. This study is significant as it deepens our understanding of the surface behavior of doped oxide materials, i.e., TiO<sub>2</sub>, paving the way for enhanced insights into their catalytic properties and potential applications in heterogeneous catalysis.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 3","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Construction Hydroxyapatite on {101} and {001} Facets of TiO2 for Tetracycline and Bacterial Elimination
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-01-31 DOI: 10.1007/s10562-025-04951-8
Wenjing Chen, Xinhao Sun, Bowen Sun, Wen Zhang, Yu Zhou, Qinxue Nie, Xian Che, Xiangang Lin, Yangyang Li, Yuanxu Liu

Environmental pollution and bacterial infections are serious problems that mankind has been facing. The simultaneous removal of pollutants and bacteria has attracted widespread attention. Herein, Hydroxyapatite (HAp)/TiO2 photocatalysts were prepared with anatase TiO2 exposing {101} and {001} facets as supports. HAp/TiO2{101} exhibited excellent enhancement in photocatalytic degradation compared to HAp/TiO2{001} and the pristine TiO2 nanocrystals. The optimum HAp/TiO2{101} photocatalyst displayed 77% degradation efficiency of tetracycline (TC) under 300 W xenon lamp within 60 min, as well as excellent stability and reproducibility. The inhibition rates for Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) are up to 98.3% and 97.2%, respectively. Moreover, it is biocompatible and has a remarkable therapeutic effect on wounds infected with S. aureus. The possible photocatalytic mechanism of HAp/TiO2{101} was proposed and proved by EPR results. It has been demonstrated that ·O2, h+ as well as their corresponding reactive oxygen species (ROS) play a dominant role in the processes of TC degradation and antimicrobial actions. This work represents the first systematic exploration regarding the capability of HAp/TiO2{101} which exhibits facet-dependent properties in the photocatalytic degradation, antimicrobial activities, as well as in the treatment of wound infections. It vividly demonstrates its prospective applications in the fields of environmental protection, life, and health.

{"title":"Construction Hydroxyapatite on {101} and {001} Facets of TiO2 for Tetracycline and Bacterial Elimination","authors":"Wenjing Chen,&nbsp;Xinhao Sun,&nbsp;Bowen Sun,&nbsp;Wen Zhang,&nbsp;Yu Zhou,&nbsp;Qinxue Nie,&nbsp;Xian Che,&nbsp;Xiangang Lin,&nbsp;Yangyang Li,&nbsp;Yuanxu Liu","doi":"10.1007/s10562-025-04951-8","DOIUrl":"10.1007/s10562-025-04951-8","url":null,"abstract":"<div><p>Environmental pollution and bacterial infections are serious problems that mankind has been facing. The simultaneous removal of pollutants and bacteria has attracted widespread attention. Herein, Hydroxyapatite (HAp)/TiO<sub>2</sub> photocatalysts were prepared with anatase TiO<sub>2</sub> exposing {101} and {001} facets as supports. HAp/TiO<sub>2</sub>{101} exhibited excellent enhancement in photocatalytic degradation compared to HAp/TiO<sub>2</sub>{001} and the pristine TiO<sub>2</sub> nanocrystals. The optimum HAp/TiO<sub>2</sub>{101} photocatalyst displayed 77% degradation efficiency of tetracycline (TC) under 300 W xenon lamp within 60 min, as well as excellent stability and reproducibility. The inhibition rates for Staphylococcus aureus (<i>S. aureus)</i> and Escherichia coli (<i>E. coli)</i> are up to 98.3% and 97.2%, respectively. Moreover, it is biocompatible and has a remarkable therapeutic effect on wounds infected with <i>S. aureus</i>. The possible photocatalytic mechanism of HAp/TiO<sub>2</sub>{101} was proposed and proved by EPR results. It has been demonstrated that ·O<sub>2</sub><sup>−</sup>, h<sup>+</sup> as well as their corresponding reactive oxygen species (ROS) play a dominant role in the processes of TC degradation and antimicrobial actions. This work represents the first systematic exploration regarding the capability of HAp/TiO<sub>2</sub>{101} which exhibits facet-dependent properties in the photocatalytic degradation, antimicrobial activities, as well as in the treatment of wound infections. It vividly demonstrates its prospective applications in the fields of environmental protection, life, and health.</p></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 3","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Modified Vermiculite Supported Ru Nanoparticles as a Robust Catalyst for the Hydrogenation of Levulinic Acid to γ-Valerolactone
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-01-28 DOI: 10.1007/s10562-025-04945-6
Danhong Yang, Shihong Chen, Lei Wang, Mingdeng Liu, Lanping Lai, Lina Zhou

Organic-pillared vermiculite was applied as the support to fabricate Ru catalyst via adsorption-precipitation method. The catalytic performances of the catalyst were investigated for the selective hydrogenation of levulinic acid (LA) or methyl levulinate (ML) to γ-valerolactone (GVL). The 100% selectivity of GVL and 100% conversion of LA were obtained at 403 K, 4.0 MPa using water as solvent. Moreover, a good recyclability was observed even after 14 reaction cycles as a slight conversion decrease of the LA and no change of the selectivity of GVL. The Characterization of the fresh catalysts and reused catalysts were performed using various techniques including XRD, FT-IR, N2 adsorption-desorption, XPS and TEM. The catalytic tests and characterization data confirmed that the sample of Ru/Modified-Vermiculite can be taken as a robust and effective catalyst for the conversion of the LA to GVL.

Graphical Abstracts

The modified vermiculite supported-Ru catalyst has super activity and stability in the hydrogenation of levulinic acid to γ-valerolactone. Ru active components dispersed uniformly on the surface of organic modified vermiculite, and there was no obvious aggregation of the components. Even after fourteen cycles, levulinic acid conversion and γ-valerolactone selectivity remained 95% and 100%, respectively. The present work provides an efficient route for the preparing the Ru-based catalyst of excellent stability in the process of hydrogenation of levulinic acid.

{"title":"Modified Vermiculite Supported Ru Nanoparticles as a Robust Catalyst for the Hydrogenation of Levulinic Acid to γ-Valerolactone","authors":"Danhong Yang,&nbsp;Shihong Chen,&nbsp;Lei Wang,&nbsp;Mingdeng Liu,&nbsp;Lanping Lai,&nbsp;Lina Zhou","doi":"10.1007/s10562-025-04945-6","DOIUrl":"10.1007/s10562-025-04945-6","url":null,"abstract":"<div><p>Organic-pillared vermiculite was applied as the support to fabricate Ru catalyst via adsorption-precipitation method. The catalytic performances of the catalyst were investigated for the selective hydrogenation of levulinic acid (LA) or methyl levulinate (ML) to γ-valerolactone (GVL). The 100% selectivity of GVL and 100% conversion of LA were obtained at 403 K, 4.0 MPa using water as solvent. Moreover, a good recyclability was observed even after 14 reaction cycles as a slight conversion decrease of the LA and no change of the selectivity of GVL. The Characterization of the fresh catalysts and reused catalysts were performed using various techniques including XRD, FT-IR, N<sub>2</sub> adsorption-desorption, XPS and TEM. The catalytic tests and characterization data confirmed that the sample of Ru/Modified-Vermiculite can be taken as a robust and effective catalyst for the conversion of the LA to GVL.</p><h3>Graphical Abstracts</h3><div><figure><div><div><picture><img></picture></div><div><p>The modified vermiculite supported-Ru catalyst has super activity and stability in the hydrogenation of levulinic acid to γ-valerolactone. Ru active components dispersed uniformly on the surface of organic modified vermiculite, and there was no obvious aggregation of the components. Even after fourteen cycles, levulinic acid conversion and γ-valerolactone selectivity remained 95% and 100%, respectively. The present work provides an efficient route for the preparing the Ru-based catalyst of excellent stability in the process of hydrogenation of levulinic acid.</p></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 3","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Insight into the Co-Cracking of C6 Hydrocarbons (n-Hexane, Cyclohexane and 1-Hexene) Over HZSM-5 Zeolites
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-01-24 DOI: 10.1007/s10562-025-04948-3
Chao Wang, Zhenzhou Ma, Xu Hou

C6 hydrocarbon (n-hexane, cyclohexane and 1-hexene) co-cracking over HZSM-5 zeolites at 320–550 °C were studied in this work to get an insight into the catalytic cracking process, which played an important role in the petrochemical industry. The total conversion was in an order of 1-hexene > n-hexane/1-hexene > n-hexane > n-hexane/cyclohexane > cyclohexane, and the conversion reduction with the prolonged reaction time was in an order of 1-hexene < n-hexane/1-hexene, n-hexane < n-hexane/cyclohexane < cyclohexane. It was deduced that the presence of 1-hexene promoted the total conversion and alleviated the conversion reduction in the co-cracking, while the presence of cyclohexane reduced the total conversion and accelerated the conversion reduction with the prolonged reaction time. In addition, increasing reaction temperature and 1-hexene content promoted ethene and propene selectivity in the co-cracking. The conversion and product distribution in the co-cracking can be attributed to the unique interaction of C6 molecular structure. The six-member ring of cyclohexane hindered the diffusion process, and thus inhibited n-hexane decomposition in the co-cracking. The C = C bond of 1-hexene was easy to interact with and occupied the acid site and carbenium ions, which inhibited n-hexane decomposition while promoted the durability of n-hexane decomposition against high coke content.

{"title":"Insight into the Co-Cracking of C6 Hydrocarbons (n-Hexane, Cyclohexane and 1-Hexene) Over HZSM-5 Zeolites","authors":"Chao Wang,&nbsp;Zhenzhou Ma,&nbsp;Xu Hou","doi":"10.1007/s10562-025-04948-3","DOIUrl":"10.1007/s10562-025-04948-3","url":null,"abstract":"<div><p>C6 hydrocarbon (<i>n</i>-hexane, cyclohexane and 1-hexene) co-cracking over HZSM-5 zeolites at 320–550 °C were studied in this work to get an insight into the catalytic cracking process, which played an important role in the petrochemical industry. The total conversion was in an order of 1-hexene &gt; <i>n-</i>hexane/1-hexene &gt; <i>n-</i>hexane &gt; <i>n-</i>hexane/cyclohexane &gt; cyclohexane, and the conversion reduction with the prolonged reaction time was in an order of 1-hexene &lt; <i>n-</i>hexane/1-hexene, <i>n-</i>hexane &lt; <i>n-</i>hexane/cyclohexane &lt; cyclohexane. It was deduced that the presence of 1-hexene promoted the total conversion and alleviated the conversion reduction in the co-cracking, while the presence of cyclohexane reduced the total conversion and accelerated the conversion reduction with the prolonged reaction time. In addition, increasing reaction temperature and 1-hexene content promoted ethene and propene selectivity in the co-cracking. The conversion and product distribution in the co-cracking can be attributed to the unique interaction of C6 molecular structure. The six-member ring of cyclohexane hindered the diffusion process, and thus inhibited <i>n</i>-hexane decomposition in the co-cracking. The C = C bond of 1-hexene was easy to interact with and occupied the acid site and carbenium ions, which inhibited <i>n</i>-hexane decomposition while promoted the durability of <i>n</i>-hexane decomposition against high coke content.</p></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 3","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Tartaric Acid Assisted Preparation of Highly Dispersed Ni/SAPO-11 Catalysts for Hydrocarbon Hydroisomerization
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-01-23 DOI: 10.1007/s10562-025-04940-x
Chenglong Wen, Kang Liu, Yi Lu, Xintian Wu, Shuning Li, Mohong Lu, Jie Zhu, Mingshi Li, Chunshan Song, Xiaosong Lu

Ni/SAPO-11 catalysts with highly dispersed Ni (TA-Ni/SA-11) were prepared using tartaric acid as a dispersant. The effect of the tartaric acid content on the physiochemical properties of the TA-Ni/SA-11 catalysts and their n-heptane hydroisomerization performance were investigated. TA-Ni/SA-11 exhibits smaller Ni particles and more Ni active sites in comparison to conventional Ni/SAPO-11 prepared via the impregnation method due to the interaction between tartaric acid and Ni2+. As the molar ratio of tartaric acid and Ni2+ (nTA/nNi) increases, the number of Ni active sites in TA-Ni/SA-11 rises, while the surface area and relative crystallinity decrease because of the dealumination of SAPO-11. When nTA/nNi is 0.75, 0.75TA-Ni/SA-11 presents the highest n-heptane conversion of 82.4% and isomer selectivity of 90.5%, as well as the lowest cracking selectivity of 9.0% at 380 °C, 1.5 MPa, 2 h− 1, and a volume ratio of H2 to n-heptane of 400 among these catalysts.

Graphical Abstract

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引用次数: 0
The Effect of Metal-Doped ZIF-67 on the Thermal Decomposition of Nitrocellulose 金属掺杂ZIF-67对硝化纤维素热分解的影响
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-01-22 DOI: 10.1007/s10562-025-04938-5
Ju Jiang, Zhi-Tao Liu, Hao Guo, Qian-Jin Zhou, Run-Ze Hou, Meng-Lin Cheng, Fei-Yun Chen, Xin Liao

Metal-doped ZIF-67 (M-Z, M = Ni, Cu) was prepared by liquid phase precipitation method, and its microstructure, crystal structure, and specific surface area were determined by characterization methods such as SEM, TEM, FTIR, XRD, XPS, BET, etc. SEM and TEM images show that M-Z is a regular dodecahedron, maintaining the basic morphology of ZIF-67. FTIR and XRD confirm the existence of the crystal structure, and XPS reveals the elemental composition of M-Z, proving the successful doping of the metal. BET data shows that M-Z has an excellent specific surface area, providing favorable conditions for catalysis. The thermal decomposition kinetics and thermodynamics of M-Z on the catalytic decomposition of nitrocellulose at different heating rates (5, 10, 15, 20 K·min− 1) were studied using DSC. According to the findings, Ni-Z exhibited the greatest catalytic activity on nitrocellulose, with the decomposition temperature advanced by 3.4 ℃ and the activation energy reduced by 12.93 kJ·mol− 1.

Graphical Abstract

采用液相沉淀法制备了金属掺杂ZIF-67 (M- z, M = Ni, Cu),并通过SEM、TEM、FTIR、XRD、XPS、BET等表征方法对其微观结构、晶体结构和比表面积进行了测定。SEM和TEM图像显示M-Z为正十二面体,保持了ZIF-67的基本形貌。FTIR和XRD证实了晶体结构的存在,XPS揭示了M-Z的元素组成,证明了金属的成功掺杂。BET数据表明,M-Z具有优异的比表面积,为催化提供了有利条件。采用DSC研究了M-Z在不同升温速率(5、10、15、20 K·min−1)下催化分解硝化纤维素的热分解动力学和热力学。结果表明,Ni-Z对硝化纤维素的催化活性最高,分解温度提高了3.4℃,活化能降低了12.93 kJ·mol−1。图形抽象
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引用次数: 0
Photocatalytic Performance of Silver-Doped Zinc Oxide Nanoparticles for Methylene Blue Degradation 掺杂银氧化锌纳米颗粒降解亚甲基蓝的光催化性能
IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL Pub Date : 2025-01-21 DOI: 10.1007/s10562-025-04932-x
Amogne Wendu Digisu, Abrha Berhe Yaebyo, Worku Lakew Kebede, Hayat Mulaw Ahmed, Tarekegn Fentie Yemir

The primary sources of water contamination are wastes from industrial regions, including pesticide residues, paper, organic textile, and pharmaceuticals. Specifically, organic dyes released by industries have the capacity to be harmful, biorecalcitrant, indestructible, fade-resistant, and pose a significant risk to human health. At 60 °C, Ag/ZnO nanoparticles with various Ag concentrations were prepared. Several characterization methods, including scanning electron microscopy (SEM), UV–vis spectroscopy, and X-ray diffraction (XRD), have been utilized to investigate the Ag/Zn-2. The progress of methylene blue decolorization was examined via UV–vis spectroscopy. The Ag/Zn-2 photocatalysts had a surface area of 89.5 m2/g and a crystallinity of 90%.The catalytic performance for the methylene blue (MB) was assessed. Ag/Zn-2, one of the photocatalysts, had the greatest rate of MB dye degradation, reaching 97.1% in 105 min. After five cycles, the Ag/Zn-2 catalyst showed improved structural stability and durability but lost appoximately 3.8% of its efficiency. The pseudo-1st order kinetic model with a rate constant (k) of 0.03304 min−1 described superoxide and hydroxyl radicals as the main active species in the degradation process. When silver is introduced as a dopant to the zinc oxide crystal structure, the band gap energy is significantly lower, allowing for the absorption of a wider variety of light wavelengths. Furthermore, the presence of Ag helps to prevent electron-hole recombination, which can reduce the photocatalytic efficacy.This study presents a novel way to improve the photocatalytic properties of a basic metal–semiconductor material made from Rumex abyssinicus Jacq root extract, making it a suitable option for environmental remediation.

Graphical Abstract

水污染的主要来源是来自工业区的废物,包括农药残留、纸张、有机纺织品和药品。具体来说,工业释放的有机染料具有有害、生物难降解、不破坏、不褪色的能力,对人类健康构成重大风险。在60℃下,制备了不同银浓度的Ag/ZnO纳米颗粒。利用扫描电镜(SEM)、紫外可见光谱(UV-vis)和x射线衍射(XRD)等表征方法对Ag/Zn-2进行了表征。用紫外-可见光谱法研究了亚甲基蓝脱色的研究进展。Ag/Zn-2光催化剂的比表面积为89.5 m2/g,结晶度为90%。对亚甲基蓝(MB)的催化性能进行了评价。Ag/Zn-2光催化剂对MB染料的降解率最高,在105 min内达到97.1%。循环5次后,Ag/Zn-2催化剂的结构稳定性和耐久性有所提高,但效率下降约3.8%。在速率常数k为0.03304 min−1的准一级动力学模型中,超氧自由基和羟基自由基是降解过程中的主要活性物质。当银作为掺杂剂引入氧化锌晶体结构时,带隙能量显著降低,允许吸收更广泛的光波长。此外,银的存在有助于防止电子-空穴复合,从而降低光催化效果。本研究提出了一种新的方法来改善由蛇耳草根提取物制成的碱性金属半导体材料的光催化性能,使其成为环境修复的合适选择。图形抽象
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引用次数: 0
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Catalysis Letters
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