ChemCatChem最新文献_第6页

Application of Fe3O4@MCC Nanoparticles as a Heterogeneous Catalyst for Sustainable Multicomponent Synthesis of 2,3'‐Biindoles 应用 Fe3O4@MCC 纳米颗粒作为可持续多组分合成 2,3'-联吲哚的异构催化剂

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-04 DOI: 10.1002/cctc.202401308

Ajay U. Pandya, Mukesh P. Chaudhari, Vinay S. Sharma, Archana George, Gopal N. Shiyal, Pranav S Shrivastav

{"title":"Application of Fe3O4@MCC Nanoparticles as a Heterogeneous Catalyst for Sustainable Multicomponent Synthesis of 2,3'‐Biindoles","authors":"Ajay U. Pandya, Mukesh P. Chaudhari, Vinay S. Sharma, Archana George, Gopal N. Shiyal, Pranav S Shrivastav","doi":"10.1002/cctc.202401308","DOIUrl":"https://doi.org/10.1002/cctc.202401308","url":null,"abstract":"Developing innovative methods for synthesizing unique 2,3'‐biindole derivatives is crucial for the progression of drug and material discovery. The use of transition‐metal‐catalyzed coupling improves the efficiency and structural diversity in the synthesis of biindoles. Among these methods, heterogeneous catalysis, particularly using Fe3O4 nanocatalyst supported by microcrystalline cellulose (MCC), is promising for green chemistry applications. In the present work, sixteen 2,3'‐biindole derivatives (4a‐p) were prepared using Fe3O4@MCC nano catalyst which demonstrated enhanced performance, cost‐effectiveness, and reusability. The magnetic properties of the catalyst enable easy separation, simplifying purification processes and enhancing overall reaction efficiency to 78‐93%. This method aligns with sustainable chemical practices and offers practical benefits for various industrial applications. This environmentally friendly method boasts several advantages and demonstrates excellent green chemistry metrics, including process mass intensity, environmental impact factor, atom economy, and reaction mass efficiency, atom economy, carbon efficiency, chemical yield and optimum efficiency.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"38 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208738","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

Altering Oxygen Adsorption Model on B‐Doped Fe‐Cu Dual‐Atom Catalysts for Efficient Oxygen Reduction 改变掺杂 B 的铁铜双原子催化剂的氧气吸附模型，实现高效氧气还原

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-04 DOI: 10.1002/cctc.202401272

Jianglong Guo, Qizheng An, Xu Zhang, Yuhao Zhang, Jingjing Jiang, Jing Zhang, Baojie Li, Xupeng Qin, Wei Wang, Qinghua Liu

{"title":"Altering Oxygen Adsorption Model on B‐Doped Fe‐Cu Dual‐Atom Catalysts for Efficient Oxygen Reduction","authors":"Jianglong Guo, Qizheng An, Xu Zhang, Yuhao Zhang, Jingjing Jiang, Jing Zhang, Baojie Li, Xupeng Qin, Wei Wang, Qinghua Liu","doi":"10.1002/cctc.202401272","DOIUrl":"https://doi.org/10.1002/cctc.202401272","url":null,"abstract":"Due to isolated active sites of single‐atom catalysts (SACs), the catalytic kinetics of SACs are often unsatisfactory in those catalytic reaction processes involving multiple intermediates and reaction pathways, such as the oxygen reduction reaction (ORR). To address this bottleneck and enhance the ORR performance of SACs, we developed a boron‐doped Fe‒Cu dual‐atom catalyst (Fe‒Cu‒B/NC). This catalyst is designed to modulate the oxygen adsorption model and adjust the adsorption strength of oxygen intermediates at the metal sites. In situ synchrotron infrared spectroscopy demonstrated that the Fe‒Cu‒B/NC catalyst facilitates the adsorption of oxygen intermediates on the Fe‒Cu dual sites through a bridge adsorption model, which is more favorable for O–O bond cleavage. Meanwhile, in situ electrochemical impedance spectroscopy revealed that the transformation of the adsorption model can accelerate the kinetics of intermediate species, further enhancing the catalytic efficiency. As a result, Fe‒Cu‒B/NC exhibits good ORR activity and strong durability, retaining 90% of its initial current density after 10 hours of the ORR process in alkaline media.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"36 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208739","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

Efficient Ru/Y2O3 Catalyst Derived from Ru Nanoparticles on Yttrium Carbonate for Production of Hydrogen from Ammonia Decomposition 由碳酸钇上的 Ru 纳米粒子衍生的高效 Ru/Y2O3 催化剂用于利用氨分解制取氢气

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-04 DOI: 10.1002/cctc.202401314

Ji Feng, Ningbo Wan, Xiaohua Ju, Lin Liu, Liguang Bai, Xiaodong Zhao, Teng He

{"title":"Efficient Ru/Y2O3 Catalyst Derived from Ru Nanoparticles on Yttrium Carbonate for Production of Hydrogen from Ammonia Decomposition","authors":"Ji Feng, Ningbo Wan, Xiaohua Ju, Lin Liu, Liguang Bai, Xiaodong Zhao, Teng He","doi":"10.1002/cctc.202401314","DOIUrl":"https://doi.org/10.1002/cctc.202401314","url":null,"abstract":"Hydrogen production from decomposition of ammonia is one of the promising methods to solve the problem of hydrogen storage and transportation. Currently, ruthenium‐based catalysts are widely recognized as highly active catalysts for ammonia decomposition reaction. Here, Ru nanoparticles (NPs) on yttrium oxide derived from yttrium carbonate precursor (c‐Y2O3) was successfully prepared by impregnation method. A hydrogen production rate up to 31.5 mmol gcat−1 min−1 can be obtained over the 5% Ru/c‐Y2O3 catalyst at 450 °C with a weight hour space velocity (WHSV) of 30000 mL gcat−1 h−1, and the activity is stable during a test period of 120 hours. Characterization results reveal that high metal dispersion of Ru NPs, strong metal‐support interaction, high concentration of oxygen vacancies and suitable basicity of Ru/c‐Y2O3 catalyst all have a strong influence on the catalytic performance in ammonia decomposition. NH3 temperature‐programmed surface reaction (NH3‐TPSR) results indicate that a strong NH3 adsorption activation and binding desorption of nitrogen ability on the surface of Ru/c‐Y2O3 catalysts are also beneficial for the high activity. These results provide a reference for the design of efficient Ru‐based ammonia decomposition catalysts for hydrogen production by tuning the precursor of Y2O3 support.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"17 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208741","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

Asymmetric Rh‐Catalyzed [2+2+2] Cycloaddition: Synthesis of N‐Alkenylindoles with both Axial and Central Chirality 不对称 Rh 催化 [2+2+2] 环加成：具有轴向和中心手性的 N-烯基吲哚的合成

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-03 DOI: 10.1002/cctc.202401143

Zhenghu Xu, Xuan Zhang, Teng Qi, Tung Chen-Ho

引用次数: 0

Current Status of Amine Dehydrogenases: From Active Site Architecture to Diverse Applications Across a Broad Substrate Spectrum 胺脱氢酶的现状：从活性位点结构到广泛底物范围内的多样化应用

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-03 DOI: 10.1002/cctc.202400469

Vasilis Tseliou, Marcelo F. Masman, Tanja Knaus, Francesco G. Mutti

{"title":"Current Status of Amine Dehydrogenases: From Active Site Architecture to Diverse Applications Across a Broad Substrate Spectrum","authors":"Vasilis Tseliou, Marcelo F. Masman, Tanja Knaus, Francesco G. Mutti","doi":"10.1002/cctc.202400469","DOIUrl":"https://doi.org/10.1002/cctc.202400469","url":null,"abstract":"Amine dehydrogenases (AmDHs) are NAD(P)H‐dependent oxidoreductases that catalyze the reductive amination between carbonyl compounds and ammonia as the amine donor yielding valuable amines, typically with excellent enantioselectivity. While nature has provided enzymes with inherent AmDH activities, protein engineering techniques allowed researchers to expand the toolbox of available AmDHs, extend their substrate scope, improve their catalytic activities and stability under synthetically relevant conditions and even enable new reactivity concepts. The biocatalytic synthesis of amines using AmDHs has matured to a point where hundreds of aldehydes or ketones, of varying steric demands and bearing diverse functional groups, can be efficiently transformed. This review offers an overview of the available AmDHs and their substrate spectrum, covering from structural and evolutionary analyses to diverse methods employing these enzymes. Depending on the catalytic activities of other enzymes as reaction partners, AmDHs were applied in kinetic resolution (KR) and deracemization processes, cascade reactions for the amination of alcohols and alkenes or for the synthesis of amines and amino alcohols featuring multiple stereogenic centers. Moreover, the synthetic potential of AmDHs in novel pathways, such as the synthesis of secondary amines or alcohols, presents exciting opportunities for expanding their catalytic repertoire.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"23 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208743","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

Nitration of benzene to nitrobenzene using NO2 as nitro source under mild and solvent‐free conditions 在温和无溶剂条件下以 NO2 为硝基源将苯硝化为硝基苯

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-03 DOI: 10.1002/cctc.202401176

Wenzhi Zhang, Pinhua Yu, Yakang Zhang, Yuanxi Sheng, Chun Fu, Haitao Li, Jiao Geng, Weihua Han, Xingbang Hu

引用次数: 0

Unraveling Molecular Diffusion Behaviors on the Acidic Sites of H‐ZSM‐5 Zeolite using Time‐Resolved in‐situ FT‐IR Technique 利用时间分辨原位傅立叶变换红外技术揭示 H-ZSM-5 沸石酸性位点上的分子扩散行为

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-03 DOI: 10.1002/cctc.202401144

Yangdong Wang, Xiaoliang Liu, Yu Wang, Jiawei Teng, Zaiku Xie

{"title":"Unraveling Molecular Diffusion Behaviors on the Acidic Sites of H‐ZSM‐5 Zeolite using Time‐Resolved in‐situ FT‐IR Technique","authors":"Yangdong Wang, Xiaoliang Liu, Yu Wang, Jiawei Teng, Zaiku Xie","doi":"10.1002/cctc.202401144","DOIUrl":"https://doi.org/10.1002/cctc.202401144","url":null,"abstract":"Zeolites, renowned for their abundant crystalline structures and moderate acidities, have garnered significant attention in industrial chemical processes. Among them, the diffusion behaviors of various hydrocarbons within zeolite play a pivotal role due to their profound impact on product selectivity and separation efficiency. While acid sites are essential in determining the catalytic performance of zeolites, their effect on intra‐crystalline diffusivities has often been neglected in catalyst design. Herein, we employ a homemade time‐resolved in‐situ Fourier Transform Infrared (TR in‐situ FT‐IR) spectroscopy to investigate the intricate interplay between Brønsted acid sites and various probe molecules. Our study reveals that an augmentation in the density of Brønsted acid sites within H‐ZSM‐5 zeolites remarkably enhances the diffusivity of 1‐butene, in stark contrast to the behavior observed for iso‐butane. This contrasting effect in diffusivity is attributed to the distinct nature of interactions between alkenes and alkanes with Brønsted acid sites. Specifically, the π‐H interactions between alkenes and acid sites act as a driving force, propelling the alkene molecules forward through the zeolite pores. These findings offer valuable insights into designing tailored zeolites with specific acid site properties, controlling the transport behaviors of various probe molecules, and promising new avenues for catalysis and separation.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"176 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208744","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

Enantioselective Construction of Planar‐Chiral Molecules by Catalytic Asymmetric Late‐Stage Functionalizations 通过催化不对称后期官能化对平面手性分子进行对映选择性构建

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-03 DOI: 10.1002/cctc.202401312

Yu-Hang Zhao, Deng Zhu, Zhi-Min Chen

引用次数: 0

Enhanced Catalytic Stability of Laccase Immobilized on Copper Oxide Nanoparticles 增强固定在纳米氧化铜颗粒上的漆酶的催化稳定性

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-02 DOI: 10.1002/cctc.202401232

F. Javier Suarez, Sergio Ojeda Santillán, Rafael Vazquez-Duhalt, Olivia A. Graeve

{"title":"Enhanced Catalytic Stability of Laccase Immobilized on Copper Oxide Nanoparticles","authors":"F. Javier Suarez, Sergio Ojeda Santillán, Rafael Vazquez-Duhalt, Olivia A. Graeve","doi":"10.1002/cctc.202401232","DOIUrl":"https://doi.org/10.1002/cctc.202401232","url":null,"abstract":"We describe the design and catalytic activity of enzymatic nanoreactors based on copper oxide nanoparticles surface‐functionalized with laccase (CuO‐Lac) from Coriolopsis gallica. Transmission electron micrographs show complete laccase coverage on the nanoparticle surfaces. In addition, the catalytic rate (kcat) of the immobilized laccase is two‐fold higher at an optimized pH, when compared with free laccase, while the affinity constant (KM) is not significantly affected. Importantly, the total turnover number (TNN) of the CuO‐Lac nanoreactors reaches 358 ± 9 × 106 mol ABTS/mol laccase, which is four times higher than the TTN obtained for the free enzyme (88 ± 3 × 106). Thus, our nanoreactors exhibit a significant improvement in laccase catalytic performance. Inductively coupled plasma mass spectrometry was used to confirm the loss of copper ions from free laccase during the catalytic cycle, suggesting that the CuO nanoparticles act as a copper ion source that prevents enzyme inactivation. This work contributes to an improved understanding of the CuO‐laccase interface and confirms that CuO nanoparticles serve as copper sources for laccase during catalysis.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"38 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208779","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

TEMPO‐Catalyzed Continuous‐flow Aerobic Oxidations of Alcohols on Silica 二氧化硅上 TEMPO 催化的酒精连续流有氧氧化反应

IF 4.5 3区化学

ChemCatChem Pub Date : 2024-09-02 DOI: 10.1002/cctc.202401152

Kai Takizawa, Takuma Ishihara, Shinki Tani, Yusuke Hamada, Koichiro Masuda, Shun-ya Onozawa, Kazuhiko Sato, Shū Kobayashi

{"title":"TEMPO‐Catalyzed Continuous‐flow Aerobic Oxidations of Alcohols on Silica","authors":"Kai Takizawa, Takuma Ishihara, Shinki Tani, Yusuke Hamada, Koichiro Masuda, Shun-ya Onozawa, Kazuhiko Sato, Shū Kobayashi","doi":"10.1002/cctc.202401152","DOIUrl":"https://doi.org/10.1002/cctc.202401152","url":null,"abstract":"2,2,6,6'‐Tetramethylpiperidine‐N‐oxyl (TEMPO) is a highly efficient oxidation catalyst, valued for its environmentally benign nature, particularly in comparison to transition‐metal catalysts. Despite their merits, TEMPO‐based catalysts are not notably cost‐effective. Immobilization of TEMPO onto supports offers a promising strategy to overcome this limitation. In this work, we present the synthesis and application of immobilized TEMPO catalysts 2–5, prepared via a straightforward condensation reaction, for the aerobic oxidation of alcohols. These catalysts demonstrate remarkable activity for alcohol oxidations under continuous‐flow conditions, employing nitric acid as the co‐catalyst. Notably, catalyst 2 immobilized by COOH silica gel exhibits outstanding performance for the oxidation of benzyl alcohol by oxygen gas, achieving a turnover frequency (TOF) of 15 h−1 and a turnover number (TON) exceeding 300. Catalyst 2 further demonstrates broad substrate scope, effectively oxidizing primary, secondary, and benzylic alcohols. Post‐reaction analysis of spent catalyst 2 reveals that deactivation primarily stems from nitrosation of the N‐O bond. Interestingly, the amide moiety remains intact despite the harsh acidic reaction conditions.","PeriodicalId":141,"journal":{"name":"ChemCatChem","volume":"7 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142208750","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