CeNiO3 catalyst and its modification with manganese were investigated for dry Reforming of methane reaction. The experiments were performed at 700 °C to examine the effect of manganese loading on catalyst activity and stability. A series of ternary perovskite-type oxides CeNi1−xMnxO3 (x = 0, 0.2, 0.4, and 0.6) was synthesized by the self-combustion method. These samples were analyzed by several techniques, including X-ray diffraction, infrared spectroscopy, N2 adsorption-desorption isotherm, scanning electron microscope, temperature programmed reduction (TPR) and thermogravimetric (TGA) analysis. The characterization results revealed the presence of the crystalline perovskite phase for all catalysts and an appropriate elemental composition. Catalytic activity decreased with increasing Mn content, with CeNiO3 showing the highest conversion due to the high reducibility of Ni as indicated by the TPR analysis. While partial substitution of Ni by Mn was found to be highly beneficial in terms of stability. A carbon balance (Xc) equal to 100% was obtained over the substituted catalysts CeNi1−xMnxO3 (x = 0.2, 0.4 and 0.6). This finding was further supported by thermogravimetric analysis (TGA) after 24 h of reaction, which revealed significant coke deposition (~ 25%) on the CeNiO3 catalyst. In contrast, no carbon deposition was detected on the CeNi0.4M0.6O3.
{"title":"The Role of Manganese in CeNi1−xMnxO3 Nano-Crystalline Perovskites for Dry Reforming of Methane to Produce Syngas","authors":"Ouarda Benlounes, Kahina Ikkour, Djamila Sellam, Mourad Halouane, Nora Yahi, Juliette Blanchard, Saremblé Kone Guira","doi":"10.1007/s10562-025-05270-8","DOIUrl":"10.1007/s10562-025-05270-8","url":null,"abstract":"<div><p>CeNiO<sub>3</sub> catalyst and its modification with manganese were investigated for dry Reforming of methane reaction. The experiments were performed at 700 °C to examine the effect of manganese loading on catalyst activity and stability. A series of ternary perovskite-type oxides CeNi<sub>1−x</sub>Mn<sub>x</sub>O<sub>3</sub> (x = 0, 0.2, 0.4, and 0.6) was synthesized by the self-combustion method. These samples were analyzed by several techniques, including X-ray diffraction, infrared spectroscopy, N<sub>2</sub> adsorption-desorption isotherm, scanning electron microscope, temperature programmed reduction (TPR) and thermogravimetric (TGA) analysis. The characterization results revealed the presence of the crystalline perovskite phase for all catalysts and an appropriate elemental composition. Catalytic activity decreased with increasing Mn content, with CeNiO<sub>3</sub> showing the highest conversion due to the high reducibility of Ni as indicated by the TPR analysis. While partial substitution of Ni by Mn was found to be highly beneficial in terms of stability. A carbon balance (Xc) equal to 100% was obtained over the substituted catalysts CeNi<sub>1−x</sub>Mn<sub>x</sub>O<sub>3</sub> (x = 0.2, 0.4 and 0.6). This finding was further supported by thermogravimetric analysis (TGA) after 24 h of reaction, which revealed significant coke deposition (~ 25%) on the CeNiO<sub>3</sub> catalyst. In contrast, no carbon deposition was detected on the CeNi<sub>0.4</sub>M<sub>0.6</sub>O<sub>3</sub>.</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":"156 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891240","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}
Pub Date : 2026-01-03DOI: 10.1007/s10562-025-05274-4
Devarshi P. Tadvi, Heena N. Katariya, Milap G. Nayak, Kamlesh Gurjar
The present research addresses key barriers in converting high-FFA, non-edible oils like neem into biodiesel, mainly low yields and process inefficiency using conventional catalysts and heating methods. Study reports a novel approach utilizing a graphene oxide based heterogeneous catalyst (KOH@GO), synthesised by a modified Hummer’s method, for the production of biodiesel from non-edible neem oil. For efficient transesterification, initially, the high free fatty acid (FFA) content of neem oil was reduced via esterification to lower its acid value. Subsequently, a microwave- assisted transesterification was adopted to enhance reaction kinetics and energy efficiency. Significant reaction parameters including methanol-to-oil molar ratio, reaction time, catalyst loading, and temperature, were systematically optimized to study their effects on production efficiency. This innovation enables efficient, high-yield biodiesel production while enhancing catalyst reusability and reducing energy input, thus offering a scalable and sustainable alternative for biodiesel production from challenging feedstocks.
{"title":"Microwave-Assisted Biodiesel Production from Non-edible Neem Oil Using KOH@GO Catalyst Synthesized Via Modified Hummer’s Method","authors":"Devarshi P. Tadvi, Heena N. Katariya, Milap G. Nayak, Kamlesh Gurjar","doi":"10.1007/s10562-025-05274-4","DOIUrl":"10.1007/s10562-025-05274-4","url":null,"abstract":"<div><p>The present research addresses key barriers in converting high-FFA, non-edible oils like neem into biodiesel, mainly low yields and process inefficiency using conventional catalysts and heating methods. Study reports a novel approach utilizing a graphene oxide based heterogeneous catalyst (KOH@GO), synthesised by a modified Hummer’s method, for the production of biodiesel from non-edible neem oil. For efficient transesterification, initially, the high free fatty acid (FFA) content of neem oil was reduced via esterification to lower its acid value. Subsequently, a microwave- assisted transesterification was adopted to enhance reaction kinetics and energy efficiency. Significant reaction parameters including methanol-to-oil molar ratio, reaction time, catalyst loading, and temperature, were systematically optimized to study their effects on production efficiency. This innovation enables efficient, high-yield biodiesel production while enhancing catalyst reusability and reducing energy input, thus offering a scalable and sustainable alternative for biodiesel production from challenging feedstocks.</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":"156 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891177","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}
Pub Date : 2026-01-03DOI: 10.1007/s10562-025-05291-3
Bouthaina Ben Hadj Hmida, Sameh Ben Mabrouk, Monia Blibech, Adel Sayari, Aida Hmida-Sayari
Starch is a vital raw material for numerous industries, but conventional processing methods are energy-intensive and environmentally detrimental. Raw starch-digesting amylases provide a sustainable alternative by directly hydrolyzing raw starch at temperatures below its gelatinization point. A novel raw starch-digesting α-amylase (Amy-38) from Bacillus cereus spH1 was purified to homogeneity after ammonium sulfate precipitation and gel filtration, achieving a 17.8-fold purification and 12.3% yield. The purified amylase presents a molecular weight of 68 kDa, with optimal activity at pH 7.0 and 60 °C. Optimal stability was observed at pH levels of 6.0–7.5 and temperatures of 40–55 °C. The enzyme retained 90% or 85% of its activity after 30 min incubation at pH 7.5 or 45 °C, respectively. Moreover, Ca²⁺ was the most effective activator for Amy-38 (224%) followed by Mg²⁺ (176%). The amylase exhibited specificity for starch, with average Km and Vmax values of 18.18 mg/mL and 72.99 µmol/min/mL, respectively. The hydrolysis of raw wheat starch was optimized using Response Surface Methodology. Using 5% native wheat starch, 52.14% reducing sugars were produced at 60 °C for 3 h, eliminating the need for energy-intensive gelatinization. These results demonstrate that Amy-38 is a potent catalyst for efficient hydrolysis of raw starch, positioning it as a promising and sustainable biocatalyst for industrial applications.
{"title":"Towards Sustainable Biocatalysis: A Novel Thermostable Raw Starch-Digesting Amylase from Bacillus Cereus as a Green and Eco-Friendly Alternative for Starch Processing","authors":"Bouthaina Ben Hadj Hmida, Sameh Ben Mabrouk, Monia Blibech, Adel Sayari, Aida Hmida-Sayari","doi":"10.1007/s10562-025-05291-3","DOIUrl":"10.1007/s10562-025-05291-3","url":null,"abstract":"<div><p>Starch is a vital raw material for numerous industries, but conventional processing methods are energy-intensive and environmentally detrimental. Raw starch-digesting amylases provide a sustainable alternative by directly hydrolyzing raw starch at temperatures below its gelatinization point. A novel raw starch-digesting α-amylase (Amy-38) from <i>Bacillus cereus</i> spH1 was purified to homogeneity after ammonium sulfate precipitation and gel filtration, achieving a 17.8-fold purification and 12.3% yield. The purified amylase presents a molecular weight of 68 kDa, with optimal activity at pH 7.0 and 60 °C. Optimal stability was observed at pH levels of 6.0–7.5 and temperatures of 40–55 °C. The enzyme retained 90% or 85% of its activity after 30 min incubation at pH 7.5 or 45 °C, respectively. Moreover, Ca²⁺ was the most effective activator for Amy-38 (224%) followed by Mg²⁺ (176%). The amylase exhibited specificity for starch, with average Km and Vmax values of 18.18 mg/mL and 72.99 µmol/min/mL, respectively. The hydrolysis of raw wheat starch was optimized using Response Surface Methodology. Using 5% native wheat starch, 52.14% reducing sugars were produced at 60 °C for 3 h, eliminating the need for energy-intensive gelatinization. These results demonstrate that Amy-38 is a potent catalyst for efficient hydrolysis of raw starch, positioning it as a promising and sustainable biocatalyst for industrial applications.</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":"156 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891174","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}
Pub Date : 2026-01-03DOI: 10.1007/s10562-025-05288-y
Wenbo Wang, Yanping Yuan, Yanjun Gao, Zhiyong Wang
Ammonia decomposition is a promising route for carbon-free hydrogen production, However, the development of efficient and durable non-noble metal catalysts remains challenging owing to issues such as metal sintering. Herein, we demonstrate that precursor morphology engineering is an effective strategy for addressing this limitation. By modulating the solvent system, three distinct ZIF-67 morphologies (platelet (P-), sheet (S-), and rhombic dodecahedron (R-)) were synthesized and subsequently pyrolyzed into the corresponding Co@NC catalysts. Among them, R-Co@NC exhibited a superior hierarchical micro-mesoporous N-doped carbon framework with homogeneously dispersed Co nanoparticles and abundant Co-N active sites, leading to superior catalytic performance: 82.43% NH3 conversion at 500 ℃ and a hydrogen production rate of 27.58 mmol H2 g−1 cat min−1. Moreover, R-Co@NC exhibited exceptional stability, maintaining ~ 89% conversion over 200 h at 600 ℃. Combined with the conductive carbon framework, the synergistic effect between metallic Co and Co-N sites facilitate N-H bond cleavage and N-N coupling. This study presents the importance of controlling precursor morphology in the design of advanced catalysts for ammonia decomposition.
{"title":"Morphology-Controlled ZIF-67 Derived Co@NC Catalysts for Ammonia Decomposition","authors":"Wenbo Wang, Yanping Yuan, Yanjun Gao, Zhiyong Wang","doi":"10.1007/s10562-025-05288-y","DOIUrl":"10.1007/s10562-025-05288-y","url":null,"abstract":"<div><p>Ammonia decomposition is a promising route for carbon-free hydrogen production, However, the development of efficient and durable non-noble metal catalysts remains challenging owing to issues such as metal sintering. Herein, we demonstrate that precursor morphology engineering is an effective strategy for addressing this limitation. By modulating the solvent system, three distinct ZIF-67 morphologies (platelet (P-), sheet (S-), and rhombic dodecahedron (R-)) were synthesized and subsequently pyrolyzed into the corresponding Co@NC catalysts. Among them, R-Co@NC exhibited a superior hierarchical micro-mesoporous N-doped carbon framework with homogeneously dispersed Co nanoparticles and abundant Co-N active sites, leading to superior catalytic performance: 82.43% NH<sub>3</sub> conversion at 500 ℃ and a hydrogen production rate of 27.58 mmol H<sub>2</sub> g<sup>−1</sup> cat min<sup>−1</sup>. Moreover, R-Co@NC exhibited exceptional stability, maintaining ~ 89% conversion over 200 h at 600 ℃. Combined with the conductive carbon framework, the synergistic effect between metallic Co and Co-N sites facilitate N-H bond cleavage and N-N coupling. This study presents the importance of controlling precursor morphology in the design of advanced catalysts for ammonia decomposition.</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":"156 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891175","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}
Pub Date : 2026-01-03DOI: 10.1007/s10562-025-05277-1
Lili Wu, Shuying Ren, Chengchao Liu
Alkali metal modification of cobalt-based Fischer-Tropsch synthesis catalysts suffers from poor stability. Exploring new strategies to enhance olefin selectivity and catalyst stability is of significant importance. In this work, a nitrogen-doped carbon layer-modified Co/NC-Al2O3 catalyst was prepared using oleylamine as the nitrogen source and glucose as the carbon source. Under conditions of 230 ℃, 1 MPa, and 6 SL·g− 1·h− 1, the Co/NC-Al2O3 catalyst achieved an activity of 4.2 × 10− 5 molCO·gCo− 1 s− 1 with an olefin selectivity of 34.4%, while exhibiting high stability. Characterization and performance results demonstrate that: the electron-donating effect of pyrrolic nitrogen enriches electrons in adjacent metallic Co, enhancing CO adsorption and activation while inhibiting secondary hydrogenation of α-olefins, thereby increasing olefin selectivity; The improved stability originates from the confinement effect of the carbon layer and the stabilizing role of graphitic nitrogen on Co nanoparticles.
{"title":"Nitrogen-Doped Carbon-Coated Al2O3 Supported Cobalt Fischer-Tropsch Catalysts: Boosting Durability and Olefins Selectivity","authors":"Lili Wu, Shuying Ren, Chengchao Liu","doi":"10.1007/s10562-025-05277-1","DOIUrl":"10.1007/s10562-025-05277-1","url":null,"abstract":"<div><p>Alkali metal modification of cobalt-based Fischer-Tropsch synthesis catalysts suffers from poor stability. Exploring new strategies to enhance olefin selectivity and catalyst stability is of significant importance. In this work, a nitrogen-doped carbon layer-modified Co/NC-Al<sub>2</sub>O<sub>3</sub> catalyst was prepared using oleylamine as the nitrogen source and glucose as the carbon source. Under conditions of 230 ℃, 1 MPa, and 6 SL·g<sup>− 1</sup>·h<sup>− 1</sup>, the Co/NC-Al<sub>2</sub>O<sub>3</sub> catalyst achieved an activity of 4.2 × 10<sup>− 5</sup> molCO·gCo<sup>− 1</sup> s<sup>− 1</sup> with an olefin selectivity of 34.4%, while exhibiting high stability. Characterization and performance results demonstrate that: the electron-donating effect of pyrrolic nitrogen enriches electrons in adjacent metallic Co, enhancing CO adsorption and activation while inhibiting secondary hydrogenation of α-olefins, thereby increasing olefin selectivity; The improved stability originates from the confinement effect of the carbon layer and the stabilizing role of graphitic nitrogen on Co nanoparticles.</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":"156 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891224","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}
Pub Date : 2026-01-03DOI: 10.1007/s10562-025-05278-0
Shilong Zhou, Dongbo Li, Guo Zhang, Jinglong Xing, Chengqiang Ying, Kai Li, Yi Sun, Yan Hong, Yueming Li
The development of efficient and stable bifunctional electrocatalysts composed of Earth-abundant elements to facilitate both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in water splitting still presents considerable challenges. In this work, a ZnCoFe@NiS/NF catalyst featuring a three-dimensional spherical micro-flower structure supported on nickel foam was successfully prepared through a simple, multi-step hydrothermal synthesis method. Owing to its significantly enhanced specific surface area, abundance of active sites, and superior electron conductivity, the ZnCoFe@NiS/NF catalyst demonstrates outstanding bifunctional catalytic performance in 1 M KOH. At a current density of 10 mA cm− 2, the overpotential is as low as 170 mV for the OER and 178 mV for the HER. Specifically, an overall water splitting electrolyzer constructed from ZnCoFe@NiS/NF requires only a remarkably low operating voltage of 1.52 V to achieve a current density of 10 mA cm− 2, surpassing the performance of the majority of reported bifunctional metal sulfide electrocatalysts. Furthermore, the catalyst operates at a similarly low voltage of 1.72 V and maintains stability for more than 100 h at a current density of 50 mA cm− 2. This work not only reveals the critical importance of controlling morphology and electronic properties for enhancing the kinetics of electrocatalytic reactions, but also offers a simple and effective synthetic route for the large-scale production of high-performance and highly stable overall water splitting electrocatalysts.
Graphical Abstract
开发高效、稳定的富地元素双功能电催化剂，促进析氧反应（OER）和析氢反应（HER）在水裂解过程中的发生，仍然是一个相当大的挑战。本文通过简单的多步水热合成方法，成功制备了泡沫镍支撑的三维球形微花结构ZnCoFe@NiS/NF催化剂。ZnCoFe@NiS/NF催化剂具有显著提高的比表面积、丰富的活性位点和优异的电子导电性，在1 M KOH条件下表现出优异的双功能催化性能。当电流密度为10 mA cm−2时，OER和HER的过电位分别低至170 mV和178 mV。具体来说，由ZnCoFe@NiS/NF构建的整体水分解电解槽只需要1.52 V的非常低的工作电压就可以实现10 mA cm−2的电流密度，超过了大多数报道的双功能金属硫化物电催化剂的性能。此外，该催化剂在1.72 V的低电压下工作，并在50 mA cm−2的电流密度下保持100小时以上的稳定性。这项工作不仅揭示了控制形貌和电子性质对提高电催化反应动力学的重要性，而且为大规模生产高性能、高稳定性的整体水分解电催化剂提供了一条简单有效的合成途径。图形抽象
{"title":"Constructing ZnCoFe@NiS/NF Micro-flower Structure as Highly Efficient Electrocatalysts for Overall Water Splitting","authors":"Shilong Zhou, Dongbo Li, Guo Zhang, Jinglong Xing, Chengqiang Ying, Kai Li, Yi Sun, Yan Hong, Yueming Li","doi":"10.1007/s10562-025-05278-0","DOIUrl":"10.1007/s10562-025-05278-0","url":null,"abstract":"<div><p>The development of efficient and stable bifunctional electrocatalysts composed of Earth-abundant elements to facilitate both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in water splitting still presents considerable challenges. In this work, a ZnCoFe@NiS/NF catalyst featuring a three-dimensional spherical micro-flower structure supported on nickel foam was successfully prepared through a simple, multi-step hydrothermal synthesis method. Owing to its significantly enhanced specific surface area, abundance of active sites, and superior electron conductivity, the ZnCoFe@NiS/NF catalyst demonstrates outstanding bifunctional catalytic performance in 1 M KOH. At a current density of 10 mA cm<sup>− 2</sup>, the overpotential is as low as 170 mV for the OER and 178 mV for the HER. Specifically, an overall water splitting electrolyzer constructed from ZnCoFe@NiS/NF requires only a remarkably low operating voltage of 1.52 V to achieve a current density of 10 mA cm<sup>− 2</sup>, surpassing the performance of the majority of reported bifunctional metal sulfide electrocatalysts. Furthermore, the catalyst operates at a similarly low voltage of 1.72 V and maintains stability for more than 100 h at a current density of 50 mA cm<sup>− 2</sup>. This work not only reveals the critical importance of controlling morphology and electronic properties for enhancing the kinetics of electrocatalytic reactions, but also offers a simple and effective synthetic route for the large-scale production of high-performance and highly stable overall water splitting electrocatalysts.</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":"156 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891185","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}
Three A2B-type triaryl corrole copper complexes bearing p–nitrobenzyl (1), p–methylsulfonylphenyl (2), and p–hydroxyphenyl (3) at the 10–position and pentafluorophenyl at 5- and 15-position were prepared (in which 2 is a new complex), and their electrocatalytic hydrogen evolution reaction in organic and neutral aqueous media was also investigated. The results showed that these three copper corroles exhibited good catalytic HER activity in both organic and neutral aqueous systems. Catalytic efficiency follows the order of 2 > 1 > 3, showing the stronger electron–withdrawing group can enhance more of the catalytic activity of the complexes. In organic phase, when using trifluoroacetic or ptoluenesulfonic acid as the proton source, the catalytic process may proceed via an EECC (E: electron transfer, C: proton coupling) pathway. Complex 2 had a turnover frequency up to 361.9 h− 1 in neutral aqueous media at an overpotential of 1338 mV and exhibited excellent stability during the electrolysis.
{"title":"Electrocatalytic Hydrogen Evolution Reaction of A2B-Type Triaryl Corrole Copper Complexes","authors":"Yu-Jun Shao, De-Yu Guo, Feng Li, Hao Zhang, Yan-Mei Sun, Li-Ping Si, Hai-Yang Liu","doi":"10.1007/s10562-025-05285-1","DOIUrl":"10.1007/s10562-025-05285-1","url":null,"abstract":"<p>Three A<sub>2</sub>B-type triaryl corrole copper complexes bearing <i>p</i>–nitrobenzyl (<b>1</b>), <i>p</i>–methylsulfonylphenyl (<b>2</b>), and <i>p</i>–hydroxyphenyl (<b>3</b>) at the 10–position and pentafluorophenyl at 5- and 15-position were prepared (in which <b>2</b> is a new complex), and their electrocatalytic hydrogen evolution reaction in organic and neutral aqueous media was also investigated. The results showed that these three copper corroles exhibited good catalytic HER activity in both organic and neutral aqueous systems. Catalytic efficiency follows the order of <b>2</b> > <b>1</b> > <b>3</b>, showing the stronger electron–withdrawing group can enhance more of the catalytic activity of the complexes. In organic phase, when using trifluoroacetic or ptoluenesulfonic acid as the proton source, the catalytic process may proceed via an EECC (E: electron transfer, C: proton coupling) pathway. Complex <b>2</b> had a turnover frequency up to 361.9 h<sup>− 1</sup> in neutral aqueous media at an overpotential of 1338 mV and exhibited excellent stability during the electrolysis.</p>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891242","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}
Pub Date : 2026-01-03DOI: 10.1007/s10562-025-05262-8
Ahmed M. Ajam, Khalid Haneen Abass
This study demonstrated the successful preparation of bismuth oxide (Bi2O2 NPs) using the co-precipitation method. XRD results demonstrated the formation of a pure and stable crystalline phase with an average crystallite size of 21.17 nm this increases the effective surface area for photochemical reactions, while SEM images revealed a quasi-spherical morphology with an average particle size of about 64 nm, which is favorable for increasing the effective surface area. FTIR spectra supported the presence of Bi–O and Bi–O–Bi bonds and the appearance of active surface hydroxyl groups, which enhance the chances of forming active radicals during the photocatalytic reaction. The optical properties also showed an energy band gap (≈ 2.75 eV) consistent with that reported in the literature, making Bi2O2 a promising candidate for photocatalysis. Photocatalytic tests using methylene blue dye showed an initial sharp decrease in absorption due to rapid absorption on the catalyst surface, followed by gradual photolysis due to the formation of electron and hole pairs and the production of reactive oxygen species. This demonstrated the catalyst’s excellent ability to remove organic pollutants under visible light, with consistent efficiency across multiple cycles, indicating its robustness and sustainability. These results highlight the potential of Bi2O3 nanoparticles as effective and promising catalysts for environmental applications and pollutant treatment.
{"title":"Structural and Optical Engineering of Bi2O3 Nanostructures for Enhanced Visible-Light Photocatalysis","authors":"Ahmed M. Ajam, Khalid Haneen Abass","doi":"10.1007/s10562-025-05262-8","DOIUrl":"10.1007/s10562-025-05262-8","url":null,"abstract":"<div><p>This study demonstrated the successful preparation of bismuth oxide (Bi<sub>2</sub>O<sub>2</sub> NPs) using the co-precipitation method. XRD results demonstrated the formation of a pure and stable crystalline phase with an average crystallite size of 21.17 nm this increases the effective surface area for photochemical reactions, while SEM images revealed a quasi-spherical morphology with an average particle size of about 64 nm, which is favorable for increasing the effective surface area. FTIR spectra supported the presence of Bi–O and Bi–O–Bi bonds and the appearance of active surface hydroxyl groups, which enhance the chances of forming active radicals during the photocatalytic reaction. The optical properties also showed an energy band gap (≈ 2.75 eV) consistent with that reported in the literature, making Bi<sub>2</sub>O<sub>2</sub> a promising candidate for photocatalysis. Photocatalytic tests using methylene blue dye showed an initial sharp decrease in absorption due to rapid absorption on the catalyst surface, followed by gradual photolysis due to the formation of electron and hole pairs and the production of reactive oxygen species. This demonstrated the catalyst’s excellent ability to remove organic pollutants under visible light, with consistent efficiency across multiple cycles, indicating its robustness and sustainability. These results highlight the potential of Bi<sub>2</sub>O<sub>3</sub> nanoparticles as effective and promising catalysts for environmental applications and pollutant treatment.</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":"156 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891223","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}
Pub Date : 2026-01-01Epub Date: 2026-03-18DOI: 10.1007/s10562-026-05351-2
Joseph Cartwright, Hannaneh Hosseini, Alexander Gunnarson, Anna Lazaridou, Jonathan M Mauß, Ben Davies, Samuel Pattisson, Angeles Lopez-Martin, David J Morgan, Nicholas F Dummer, Ferdi Schüth, Graham J Hutchings
Replacement of mercuric chloride catalysts to produce vinyl chloride monomer from acetylene, the precursor to PVC, is needed due to widespread environmental damage of leached mercury. Cationic gold catalysts, which have been recently commercialised, represent a more environmentally benign alternative. However, new catalysts are required to limit the atomically dispersed cationic Au from agglomeration due to reduction under reaction conditions. Several strategies are available to stabilise the Au active sites such as the use of sulphur containing ligands or to use heteroatom doped carbon as the support. Here we prepared two types of doped carbon supports; spheres derived via a hard template methodology and secondly, doped commercial activated carbon. In both cases the Au supported on S-doped carbon was superior in comparison to the undoped analogue; the acetylene conversion was enhanced by 1.6 times over the S-doped carbon sphere catalyst and 2 times over the S-doped Norit catalyst at 60 min time-on-line. The stability and activity of the gold centres are discussed with respect to the heteroatom used, in this case either sulphur, nitrogen, or a combination of the two, and compared to the unmodified supports.
Graphical abstract:
Supplementary information: The online version contains supplementary material available at 10.1007/s10562-026-05351-2.
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Pub Date : 2025-12-24DOI: 10.1007/s10562-025-05280-6
Wang Zhi-tao
{"title":"Retraction Note: Cycloaddition of Propargylic Amines and CO2 by Ni@Pd Nanoclusters Confined Within Metal–Organic Framework Cavities in Aqueous Solution","authors":"Wang Zhi-tao","doi":"10.1007/s10562-025-05280-6","DOIUrl":"10.1007/s10562-025-05280-6","url":null,"abstract":"","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145831191","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}
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