Current Catalysis最新文献_第5页

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Current Catalysis Pub Date : 2021-01-13 DOI: 10.2174/221154470902210113142708

Jerry J. Wu

引用次数: 0

Urea-SCR System Development in the Mitigation of NOx Emissions from Diesel Engines – A Review Study 尿素- scr系统在降低柴油机氮氧化物排放中的应用研究综述

Current Catalysis Pub Date : 2021-01-13 DOI: 10.2174/2211544709999200915151156

Mina Mehregan

引用次数: 2

Application of Nitrogen Heterocyclic Carbenes in Organocatalysis 氮杂环羰基在有机催化中的应用

Current Catalysis Pub Date : 2020-12-01 DOI: 10.2174/2211544709999201201120617

M. Ojha, R. Bansal

{"title":"Application of Nitrogen Heterocyclic Carbenes in Organocatalysis","authors":"M. Ojha, R. Bansal","doi":"10.2174/2211544709999201201120617","DOIUrl":"https://doi.org/10.2174/2211544709999201201120617","url":null,"abstract":"\u0000\u0000 During the last two decades, horizon of research in the field of Nitrogen Heterocyclic Carbenes\u0000(NHC) has widened remarkably. NHCs have emerged as ubiquitous species having applications in a broad range of fields,\u0000including organocatalysis and organometallic chemistry. The NHC-induced non-asymmetric catalysis has turned out to be\u0000a really fruitful area of research in recent years.\u0000\u0000\u0000\u0000 By manipulating structural features and selecting appropriate substituent groups, it has been possible to control\u0000the kinetic and thermodynamic stability of a wide range of NHCs, which can be tolerant to a variety of functional groups\u0000and can be used under mild conditions. NHCs are produced by different methods, such as deprotonation of Nalkylhetrocyclic salt, transmetallation, decarboxylation and electrochemical reduction.\u0000\u0000\u0000\u0000The NHCs have been used successfully as catalysts for a wide range of reactions making a large number of building\u0000blocks and other useful compounds accessible. Some of these reactions are: benzoin condensation, Stetter reaction, Michael\u0000reaction, esterification, activation of esters, activation of isocyanides, polymerization, different cycloaddition reactions,\u0000isomerization, etc. The present review includes all these examples published during the last 10 years, i.e. from 2010 till date.\u0000\u0000\u0000\u0000 The NHCs have emerged as versatile and powerful organocatalysts in synthetic organic chemistry. They\u0000provide the synthetic strategy which does not burden the environment with metal pollutants and thus fit in the Green\u0000Chemistry. \u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85687408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Development of Nanomaterials as Photo Catalysts for Environmental Applications 纳米材料环境光催化剂的研究进展

Current Catalysis Pub Date : 2020-11-23 DOI: 10.2174/2211544709999201123193710

A. Abu‐Dief, Wael Sabry Mohamed

{"title":"Development of Nanomaterials as Photo Catalysts for Environmental Applications","authors":"A. Abu‐Dief, Wael Sabry Mohamed","doi":"10.2174/2211544709999201123193710","DOIUrl":"https://doi.org/10.2174/2211544709999201123193710","url":null,"abstract":"Lack of environmental sustainability is a growing and pivotal matter due to the issues such as disturbances associated with biodiversity pollution and climate change. Pollutants are the major cause of these environmental threats in the atmosphere. At present, nano-based photocatalysts are at the forefront of the author's interest because of their promising potential as a green chemical-based compound, high catalytic activity, suitable and controllable surface area for wastewater treatment. Semiconductor materials on a nano-sized scale have electronic and optical properties depending on their building block size, which plays a vital role in developing smart materials that are well-efficient for simultaneously destroying harmful chemical contaminants from our environment. This makes these materials useful in many possible industrial applications, such as water purification. In this review, we have reported the most significant results contributing to the progress in the area of environmental hazardous pollutant detection and removal focused on water purification especially through photocatalysis to give readers an overview of the present research trends. Moreover, we have analyzed previous studies to indicate key principles of photocatalysis and provide guidelines that can be used to fabricate more efficient photocatalysts.","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87417377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Alteration of Activation Energy of a Reaction in the Catalase of Human Erythrocyte by Cimetidine, an In vitro Thermokinetic Study 西咪替丁改变人红细胞过氧化氢酶反应活化能的体外热力学研究

Current Catalysis Pub Date : 2020-10-23 DOI: 10.2174/2211544709999201023145901

D. Minai-Tehrani

{"title":"Alteration of Activation Energy of a Reaction in the Catalase of Human Erythrocyte by Cimetidine, an In vitro Thermokinetic Study","authors":"D. Minai-Tehrani","doi":"10.2174/2211544709999201023145901","DOIUrl":"https://doi.org/10.2174/2211544709999201023145901","url":null,"abstract":"\u0000\u0000Hydrogen peroxide is normally formed during the metabolic pathway of the\u0000body. It is a toxic compound for vital cells, which can oxidize many macromolecules and cause damage\u0000in cells. Catalase can degrade H2O2 in cells and prevent cell injury. Cimetidine is a histamine H2 receptor\u0000blocker which decreases the release of stomach acid and is used for gastrointestinal diseases. Cimetidine\u0000inhibited catalase by mixed inhibition.\u0000\u0000\u0000\u0000In this study, the effect of temperature on the binding of cimetidine to human erythrocyte\u0000catalase was investigated and kinetic factors of the binding were determined.\u0000\u0000\u0000\u0000Dixon plot confirmed the mixed type of inhibition and determined the Ki of the drug. The maximum\u0000activity of the enzyme was observed at 30°C. Arrhenius plot demonstrated that the activation\u0000energy of the enzyme reaction in the absence and presence of cimetidine was about 4.7 and 8.13 kJ/mol,\u0000respectively. The temperature coefficient (Q30-40) was determined as about 1.11 and 1.09 in the absence\u0000and presence of cimetidine.\u0000\u0000\u0000\u0000Cimetidine was able to increase the activation energy of the reaction of catalase, which\u0000confirmed the inhibition of the enzyme based on the kinetic results.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"334 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79732633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent Advances in the Silver Catalysed Synthesis of Furan and Its Applications 银催化合成呋喃的研究进展及其应用

Current Catalysis Pub Date : 2020-10-19 DOI: 10.2174/2211544709999201019162020

C. Afsina, Mohan Neetha, Thaipparambil Aneeja, G. Anilkumar

引用次数: 1

A New Approach to Synthesis of Benzyl Cinnamate: Kinetic and Thermodynamic Investigation 合成肉桂酸苄酯的新方法:动力学和热力学研究

Current Catalysis Pub Date : 2020-10-05 DOI: 10.2174/2211544709999201005170521

Gao-Ying Zhi, Xiao-Bing Li, Yun Wang, Li Han, Dong‐Hao Zhang

{"title":"A New Approach to Synthesis of Benzyl Cinnamate: Kinetic and Thermodynamic Investigation","authors":"Gao-Ying Zhi, Xiao-Bing Li, Yun Wang, Li Han, Dong‐Hao Zhang","doi":"10.2174/2211544709999201005170521","DOIUrl":"https://doi.org/10.2174/2211544709999201005170521","url":null,"abstract":"\u0000\u0000Benzyl cinnamate is widely used in many fragrance compounds. The traditional methods to obtain benzyl cinnamate, including chemical synthesis or extracted from leaves, have many drawbacks. Recently, lipase-catalyzed synthesis of benzyl cinnamate provides us a promising alternative due to its high catalytic efficiency, mild reaction conditions, and green and environmentally friendly process. In this work, the purpose is to investigate the kinetics and thermodynamics of enzymatic synthesis of benzyl cinnamate.\u0000\u0000\u0000\u0000The objective of the current study was to investigate the kinetics and thermodynamics of enzymatic synthesis of benzyl cinnamate.\u0000\u0000\u0000\u0000The results showed that the reaction followed Ping-Pong mechanism having substrate inhibition. Furthermore, the kinetic and thermodynamic parameters were estimated. The inhibition constant KiB decreased with temperature enhancement, implying that the inhibition of benzyl alcohol on lipase could be depressed at high temperature. Moreover, the activation energy of the first-step reaction (52.46 kJ/mol) was much higher than that of the second-step reaction (12.97 kJ/mol), demonstrating that the first-step reaction was the rate-limiting reaction. The esterification process was found to be endothermic, with enthalpy value (ΔH) of +55.7 kJ/mol and entropy value (ΔS) of +170.2 J/mol K, respectively. Based on the change of Gibbs free energy (ΔG), enzymatic esterification of cinnamic acid would change from nonspontaneous to spontaneous reaction when raising temperature to above 53ºC.\u0000\u0000\u0000\u0000These gained information could be utilized to optimize the biosynthesis of benzyl cinnamate.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80285947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of Cadmium Addition in Promoting the Direct N2O Decomposition of Co3O4 Spinel 镉对Co3O4尖晶石N2O直接分解的促进作用

Current Catalysis Pub Date : 2020-10-05 DOI: 10.2174/2211544709999201005165234

B. M. Abu-Zied, S. Soliman, S. E. Abdellah

{"title":"Role of Cadmium Addition in Promoting the Direct N2O Decomposition of Co3O4 Spinel","authors":"B. M. Abu-Zied, S. Soliman, S. E. Abdellah","doi":"10.2174/2211544709999201005165234","DOIUrl":"https://doi.org/10.2174/2211544709999201005165234","url":null,"abstract":"\u0000\u0000Increased environmental protection concerns urge more effort to develop\u0000new catalysts for the abetment of greenhouse gases. N2O is known as a powerful greenhouse gas.\u0000The literature review revealed that various catalysts have been developed for the direct decomposition\u0000of N2O. Special attention was given to the cobalt-based spinel oxides. However, there is a\u0000lack of information about the performance of the cadmium promoted spinels for N2O abetment.\u0000\u0000\u0000\u0000This paper addresses the nitrous oxide direct decomposition over a novel series of Cd-\u0000Co catalysts.\u0000\u0000\u0000\u0000 These catalysts, with Cd/(Cd + Co) ratios 0.00-0.333, were prepared with the aid of the\u0000co-precipitation route, which is followed by calcination at 500 °C. Characterization of these catalysts\u0000was performed employing TGA-DTA, XRD, FTIR, N2 adsorption/desorption, and atomic absorption\u0000spectrophotometry.\u0000\u0000\u0000\u0000Phase analysis revealed the absence of a solid-state interaction between CdO and Co3O4.\u0000However, it was found that increasing the Cd/(Cd + Co) ratio is associated with continuous enhancement\u0000of the N2O decomposition activity. The activity was correlated with the presence of\u0000catalyst’s redox couples. Moreover, the role of the Cd presence in improving the activity was discussed.\u0000Finally, the activity performance change accompanying the calcination temperature raise\u0000was also investigated.\u0000\u0000\u0000\u0000Presence of cadmium has a positive effect on the N2O decomposition performance\u0000of Co3O4. Activity increased continuously with Cd/(Cd + Co) ratio increase over the examined\u0000range 0.083–0.333 structural, textural, and electronic roles of cadmium were proposed.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80329636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Water-Zeolite Interfaces for Controlling Reaction Routes in Fischer- Tropsch Synthesis of Alternative Fuels 控制Fischer- Tropsch合成替代燃料反应路线的水-沸石界面

Current Catalysis Pub Date : 2020-09-10 DOI: 10.2174/2211544709999200420072505

V. Mordkovich, L. Sineva

引用次数: 1

Meet Our Editorial Board Member 认识我们的编辑委员会成员

Current Catalysis Pub Date : 2020-09-10 DOI: 10.2174/221154470901200616124830

B. Stanovnik

引用次数: 0