ChemCatChem最新文献_第10页

The effect of dithionite and its decomposition products on redox mediators used in the cyclic voltammetry of nitrogenase enzymes 连二亚硫酸盐及其分解产物对用于氮酶循环伏安法的氧化还原介质的影响

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-08-20 DOI: 10.1002/cctc.202400595

Jessica K Bilyj, Christina Gregg, Craig C Wood, Trevor Rapson

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Synergetic effect of Ni-CeO2 bimetallic catalyst for an effective decomposition of methane to hydrogen and filamentous nanocarbons Ni-CeO2 双金属催化剂在将甲烷有效分解为氢气和丝状纳米碳方面的协同效应

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-08-20 DOI: 10.1002/cctc.202400700

Adeel Ahmad, Iqra Reyaz Hamdani, Abdul Rasheed Pillantakath, Ahmed Al Shoaibi, srinivasakannan chandrasekar, Mohammad Mozahar Hossain

{"title":"Synergetic effect of Ni-CeO2 bimetallic catalyst for an effective decomposition of methane to hydrogen and filamentous nanocarbons","authors":"Adeel Ahmad, Iqra Reyaz Hamdani, Abdul Rasheed Pillantakath, Ahmed Al Shoaibi, srinivasakannan chandrasekar, Mohammad Mozahar Hossain","doi":"10.1002/cctc.202400700","DOIUrl":"https://doi.org/10.1002/cctc.202400700","url":null,"abstract":"The work attempts to synthesis nickel-ceria bimetallic catalysts supported on porous carbon template, thermally stable at 850 °C, for dehydrogenation of methane to hydrogen and carbon nanostructures. A series of bimetallic Ni catalysts were synthesized by varying the % ceria content (30Ni-5CeO2/AC, 30Ni-10Ce O2/AC, and 30Ni-15CeO2/AC) using the incipient wetness impregnation approach. Among the set of bimetallic catalysts, the 30Ni-5CeO2/AC catalyst was found to offer highest methane conversion and stability. A maximum conversion of 90% was achieved with 40% methane feed concentration along with good catalyst stability. The promoter ceria at low concentration enhanced the dispersion of metal over the catalytic surface, resulting in adequate metal-support interaction. The ability of the carbon support along with promoter ceria enhanced the thermal stability of the Ni catalyst up to 850 °C, offering high conversion and catalyst stability has been the highlight of the work. Advanced analytical techniques were used to characterize the catalyst's structural, textural, and morphological properties both before and after the reaction. The morphological study of the best-performing catalyst demonstrated the formation of dense carbon nanotubes through tip-growth mechanism exhibiting a high aspect ratio.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"5 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

One-pot synthesis of (S)-flavanones by a double-face promiscuous chemo-enzymatic cascade of lipases. 通过脂肪酶双面杂化酶级联法一次性合成(S)-黄烷酮。

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-08-20 DOI: 10.1002/cctc.202400974

Eliana Capecchi, Valentina Ubertini, Elisabetta Tomaino, Davide Piccinino, Elisa De Marchi, Bruno Mattia Bizzarri, Giovanni Carotenuto, Tiziana Castrignanò, Raffaele Saladino

{"title":"One-pot synthesis of (S)-flavanones by a double-face promiscuous chemo-enzymatic cascade of lipases.","authors":"Eliana Capecchi, Valentina Ubertini, Elisabetta Tomaino, Davide Piccinino, Elisa De Marchi, Bruno Mattia Bizzarri, Giovanni Carotenuto, Tiziana Castrignanò, Raffaele Saladino","doi":"10.1002/cctc.202400974","DOIUrl":"https://doi.org/10.1002/cctc.202400974","url":null,"abstract":"The one-pot stereoselective synthesis of (S)-flavanones from 2’-hydroxyacetophenone and substituted aromatic aldehydes was obtained by a double-face promiscuous chemo-enzymatic cascade of porcine pancreas and Mucor javanicus lipases.The reaction pathway comprises: A) cross-aldol condensation catalysed by porcine pancreas lipase to yield chalcone intermediates; B) unprecedented intramolecular oxa-Michael addition of chalcone intermediates to (S)-flavanones. Mucor javanicus lipase was the most effective enzyme in step B. Imidazole and 2-methylimidazole were studied as additive in order to improve the efficacy of the overall transformation. The sustainability of the chemo-enzymatic cascade was increased by immobilization of lipases on cross-linked hydroxy-methylated kraft lignin nanoparticles, by use of concanavalin A. Immobilization conferred considerable stability and reusability at the system for 4 runs. Noteworthy, the reaction mixture was significantly enriched in (S)-flavanones under both homogeneous and heterogeneous conditions. Computational studies encompassing docking and molecular dynamic analyses showed the role played by evolutionary conserved oxyanion holes and catalytic triad of Mucor javanicus lipase in the stereocontrol of the intra-molecular oxa-Michael addition.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"7 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Gold Catalysts for Selective Hydrogenations: The Role of Heterolytic H2 Dissociation 选择性加氢的金催化剂：异解氢解离的作用

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-08-19 DOI: 10.1002/cctc.202400207

Jhonatan Luiz Fiorio, Raíza Rosa Garcia Guerra, Belén Martin-Matute, Liane Marcia Rossi

引用次数: 0

A Radical Revolution in the 21st Century 21 世纪的激进革命

IF 3.8 3区化学

ChemCatChem Pub Date : 2024-08-14 DOI: 10.1002/cctc.202401079

Dr. Adrián Gómez-Suárez, Prof. Spence P. Pitre, Prof. Chen Zhu

{"title":"A Radical Revolution in the 21st Century","authors":"Dr. Adrián Gómez-Suárez, Prof. Spence P. Pitre, Prof. Chen Zhu","doi":"10.1002/cctc.202401079","DOIUrl":"https://doi.org/10.1002/cctc.202401079","url":null,"abstract":"This Special Collection on “Radical Chemistry in Homogeneous Catalysis and Organic Synthesis” organized in collaboration with the European Journal of Organic Chemistry and ChemCatChem showcases the maturity of field. Overall, this Special Collection encompasses 11 reviews and 27 research articles, covering a diverse range of topics. It presents the latest advancements in the controlled generation of radical species using transition metal catalysis, photoredox catalysis, or electrochemistry. It highlights the importance of moving towards more sustainable chemical processes, with particular focus on the development of novel organo(photo)catalysts, or efficient catalyst-free reactions. It presents new transformations to access complex scaffolds as well as new building blocks and reagents, further simplifying single-electron disconnection logic. In addition, it also highlights the key advancements in addressing some of the current challenges in radical chemistry, such the development of enantioselective reactions or how to scale-up radical processes to meet the needs of the fine chemical industry.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"16 19","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cctc.202401079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142429925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Smart Materials for Biocatalysis Regulation through Thermoresponsive Polymers 通过热致伸缩聚合物调节生物催化的智能材料

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-08-12 DOI: 10.1002/cctc.202400699

Heloise Ribeiro de Barros, Maíra Theisen, Maria Clara Durigon, Daiani C. Leite, Leandro Piovan, Izabel C. Riegel-Vidotti

引用次数: 0

Decomposition of N2O by Ruthenium Catalysts – RuO2 as Active Phase on Non‐Reducible Supports 钌催化剂分解 N2O - 非还原性载体上的活性相 RuO2

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-08-12 DOI: 10.1002/cctc.202400347

Xiaoqiao Zhang, Jian Zheng, Florian Johannes Boch, Simon Nickl, Klaus Köhler

引用次数: 0

Application of Hydrogen Spillover in Alkaline Hydrogen Evolution Reaction 氢溢出在碱性氢进化反应中的应用

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-08-12 DOI: 10.1002/cctc.202401121

Zehui Yang, Shuyuan Pan, Fang Luo

{"title":"Application of Hydrogen Spillover in Alkaline Hydrogen Evolution Reaction","authors":"Zehui Yang, Shuyuan Pan, Fang Luo","doi":"10.1002/cctc.202401121","DOIUrl":"https://doi.org/10.1002/cctc.202401121","url":null,"abstract":"Alkaline water splitting has shown great potential for industrial‐scale hydrogen production. However, its wide application is still limited by the performance of hydrogen evolution reaction (HER) electrocatalysts, which are difficult to achieve ideal current density under low overpotential. Applying the hydrogen spillover effect to enhance HER performance has become an emerging research direction. Although previous studies mainly focused on hydrogen overflow in acidic media, the latest studies have shown that hydrogen overflow also exists under alkaline conditions, and its role in improving HER performance cannot be ignored. In this paper, the characteristic differences of the hydrogen overflow effect under acidic and alkaline conditions were investigated in depth, and the unique behavior of hydrogen overflow in the two different environments and its influence on the catalytic process were analyzed. System hydrogen spillover characterization methods are summarized at the same time, these technologies for understanding and control of hydrogen relief process provides strong support. Finally, the recent electrocatalysts that enhance the catalytic performance of alkaline HER by hydrogen spillover effect are comprehensively sorted out and summarized. These findings not only demonstrate the practical value of hydrogen spillover under alkaline conditions, but also provide new directions for future design and optimization of electrocatalysts.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"27 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Machine Learning‐Driven Selection of Two‐Dimensional Carbon‐Based Supports for Dual‐Atom Catalysts in CO2 Electroreduction 机器学习驱动的二氧化碳电还原双原子催化剂的二维碳基载体选择

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-08-12 DOI: 10.1002/cctc.202400470

Zhen Tan, Xinyu Li, Yanzhang Zhao, Zhen Zhang, Javen Qinfeng Shi, Haobo Li

{"title":"Machine Learning‐Driven Selection of Two‐Dimensional Carbon‐Based Supports for Dual‐Atom Catalysts in CO2 Electroreduction","authors":"Zhen Tan, Xinyu Li, Yanzhang Zhao, Zhen Zhang, Javen Qinfeng Shi, Haobo Li","doi":"10.1002/cctc.202400470","DOIUrl":"https://doi.org/10.1002/cctc.202400470","url":null,"abstract":"The electrocatalytic reduction of carbon dioxide by metal catalysts featuring dual‐atomic active sites, supported on two‐dimensional carbon‐nitrogen materials, holds promise for enhanced efficiency. The potential synergy between various support materials and transition metal compositions in influencing reaction performance has been recognized. However, systematic studies on the selection of optimal support materials remain limited, primarily due to the intricate structure of dual‐atom catalysts generating a variety of potential adsorption sites. Incorporating the influence of support materials further amplifies computational challenges, doubling the already substantial calculation requirements. This study addresses this challenge by introducing a machine learning approach to expedite the identification of the most stable intermediate adsorption sites and simultaneous prediction of adsorption energy. This innovative method significantly reduces computational costs, enabling the simultaneous consideration of active sites and support materials. We explore the use of both graphene‐like (g‐)C2N and g‐C9N4 materials, revealing their main distinction in the adsorption capacity for the intermediate *CHO. This variation is attributed to the different C:N ratios influencing support for the active site through distinct charge transfer conditions. Our findings offer valuable insights for the design and optimization of dual‐atom catalysts.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"45 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141945555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Cover Feature: Organo-Soluble Colloidal MoS2 Quantum Dots (QDs) as an Efficient Photocatalyst for α-Amino Phosphonate Synthesis (ChemCatChem 15/2024) 封面专题：有机可溶胶体 MoS2 量子点 (QDs) 作为 α-氨基膦酸盐合成的高效光催化剂（ChemCatChem 15/2024）

IF 3.8 3区化学

ChemCatChem Pub Date : 2024-08-12 DOI: 10.1002/cctc.202481502

Abir Kayal, Dr. Mrinmoy De

{"title":"Cover Feature: Organo-Soluble Colloidal MoS2 Quantum Dots (QDs) as an Efficient Photocatalyst for α-Amino Phosphonate Synthesis (ChemCatChem 15/2024)","authors":"Abir Kayal, Dr. Mrinmoy De","doi":"10.1002/cctc.202481502","DOIUrl":"https://doi.org/10.1002/cctc.202481502","url":null,"abstract":"The Cover Feature of this issue highlights the work by Abir Kayal and Mrinmoy De, who describe a method for synthesizing recyclable organo-soluble MoS2 quantum dots (QDs) using a colloidal approach, which exhibits high efficiency as photocatalysts for the synthesis of biologically active α-amino phosphonates. The authors’ approach capitalizes on the oxidizing potential of molecular oxygen (O2). Specifically, MoS2 QDs are excited upon absorption of blue light, providing the necessary energy to initiate the formation of reactive iminium ion species from N-phenyl benzylamine, thereby facilitating product formation. Mechanistic analysis has underscored the critical role of MoS2 QDs in generating reactive superoxide radicals from O2 via single electron transfer (SET), highlighting their significance in this process. More information can be found in the Research Article by Abir Kayal and Mrinmoy De (DOI: 10.1002/cctc.202400264).\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture>\u0000 </div>\u0000 </figure>\u0000 ","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"16 15","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cctc.202481502","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141980351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0