Current Catalysis最新文献_第6页

Supramolecular Catalysis: An Efficient and Sustainable Multicomponent Approach to the Synthesis of Novel Hexahydro-4H-indazol-4-one Derivatives 超分子催化:一种高效、可持续的合成新型六氢-4- h -吲哚酮衍生物的多组分方法

Current Catalysis Pub Date : 2020-06-14 DOI: 10.2174/2211544709999200614165508

J. Tiwari, Swastika Singh, D. Jaiswal, A. Sharma, Shailesh Singh, Jaya Singh, Jagdamba Singh

引用次数: 0

The Influence of Calcination on the Physicochemical Properties of Acidactivated Natural Mordenite 煅烧对酸活化天然丝光沸石理化性质的影响

Current Catalysis Pub Date : 2020-04-30 DOI: 10.2174/2211544709999200430003940

S. Lycourghiotis, Dimitra Makarouni, Eleana Kordouli, K. Bourikas, C. Kordulis, V. Dourtoglou

引用次数: 4

A Road to Success! 成功之路!

Current Catalysis Pub Date : 2020-02-29 DOI: 10.2174/221154470901200616124714

Song Yang

引用次数: 0

Prospect of RuIII(edta) in Catalysis of Bicarbonate Reduction RuIII(edta)催化碳酸氢盐还原的研究前景

Current Catalysis Pub Date : 2020-02-29 DOI: 10.2174/2211544708666190902124817

Debabrata Chatterjee and Rudi van Edik

引用次数: 2

Ni/x%Nb2O5/Al2O3 Catalysts Prepared via Coprecipitation-Wet Impregnation Method for Methane Steam Reforming 共沉淀-湿浸渍法制备Ni/x%Nb2O5/Al2O3甲烷蒸汽重整催化剂

Current Catalysis Pub Date : 2020-02-29 DOI: 10.2174/2211544708666190423130340

Juliana F. Gonçalves and Mariana M.V.M. Souza

{"title":"Ni/x%Nb2O5/Al2O3 Catalysts Prepared via Coprecipitation-Wet Impregnation Method for Methane Steam Reforming","authors":"Juliana F. Gonçalves and Mariana M.V.M. Souza","doi":"10.2174/2211544708666190423130340","DOIUrl":"https://doi.org/10.2174/2211544708666190423130340","url":null,"abstract":"\u0000\u0000Hydrogen has been considered the energy source of the future and one of the\u0000processes for its production is the methane steam reforming. The catalyst used industrially is Ni/Al2O3\u0000and the addition of promoter oxides can be an alternative to improve the performance of this catalyst,\u0000which suffers from coke formation and sintering.\u0000\u0000\u0000\u0000Evaluate the role of niobia on catalytic activity and stability.\u0000\u0000\u0000\u0000Ni/x%Nb2O5/Al2O3 (x = 5, 10 and 20) catalysts were synthesized via coprecipitation-wet impregnation\u0000method and characterized by X-ray fluorescence (XRF), N2 adsorption-desorption, X-ray diffraction\u0000(XRD), temperature- programmed reduction (TPR), temperature-programmed desorption of\u0000ammonia (TPD-NH3), etc. Finally, the catalysts were tested for methane steam reforming reaction.\u0000\u0000\u0000\u0000 All niobia-doped catalysts presented similar values of methane conversion and when comparing\u0000with Ni-Al, the addition of niobia slightly improved the methane conversion. In the stability test at\u0000800oC, all doped and non-doped catalysts did not deactivate during the 24 h of reaction.\u0000\u0000\u0000\u0000 The addition of 10 and 20 wt.% of niobia had a significant promoter effect over Ni/Al2O3\u0000catalyst in terms of activity and stability at 800 oC and the sample with 20 wt.% of niobia presented\u0000lower coke formation.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"276 1","pages":"80-89"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76984740","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

Development of Green and Clean Processes for Perfumes and Flavors Using Heterogeneous Chemical Catalysis 非均相化学催化香料绿色清洁工艺的发展

Current Catalysis Pub Date : 2020-02-29 DOI: 10.2174/2211544708666190613163523

Radhika Yadav

{"title":"Development of Green and Clean Processes for Perfumes and Flavors Using Heterogeneous Chemical Catalysis","authors":"Radhika Yadav","doi":"10.2174/2211544708666190613163523","DOIUrl":"https://doi.org/10.2174/2211544708666190613163523","url":null,"abstract":"\u0000\u0000In this review, different heterogeneous catalysts based on acid, base, metal\u0000and enzymes are discussed for the synthesis of industrially relevant perfumes and flavor compounds.\u0000These molecules are mainly produced by a variety of reaction pathways such as esterification, isomerization,\u0000hydration, alkylation, hydrogenation, oxidation, etc. All these reactions are discussed thoroughly\u0000for the synthesis of vital aromatic compounds. The review also summarizes various recent\u0000technologies applied for designing new catalysts to obtain the maximum yield of the desired product.\u0000Overall, this review highlights the green, clean and eco-friendly processes which can be industrially\u0000accepted for the synthesis of perfumes, flavors and fragrances.\u0000\u0000\u0000\u0000The objective of the current review was to emphasize on the synthesis of industrially important\u0000perfumes and flavor molecules such as α-terpineol, cyclohexyl esters, thymol, raspberry ketone,\u0000etc. using heterogeneous catalysts.\u0000\u0000\u0000\u0000Three hundred and eight papers are reported in this review, the majority of which are on heterogeneous\u0000catalysis for the synthesis of molecules which impart flavor or possess perfumery characteristics.\u0000Among all, the preparation of esters is highlighted as they represent an imperative functional\u0000group in aroma chemicals.\u0000\u0000\u0000\u0000 The review confirms the need for heterogeneous catalysis in pollution-free and costeffective\u0000synthesis of flavor and perfumery compounds.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"42 3","pages":"32-58"},"PeriodicalIF":0.0,"publicationDate":"2020-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91453617","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: 1

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

Current Catalysis Pub Date : 2019-06-21 DOI: 10.2174/221154470801190509124918

S. Suib

引用次数: 0

Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics) 木质素转化为燃料和化学品(芳烃)的催化过程

Current Catalysis Pub Date : 2019-03-31 DOI: 10.2174/2211544708666190124112830

M. Ventura, M. Domine, Marvin Chávez-Sifontes

{"title":"Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics)","authors":"M. Ventura, M. Domine, Marvin Chávez-Sifontes","doi":"10.2174/2211544708666190124112830","DOIUrl":"https://doi.org/10.2174/2211544708666190124112830","url":null,"abstract":"\u0000\u0000Valorization of lignocellulosic biomass becomes a sustainable alternative against the constant\u0000depletion and environmental problems of fossil sources necessary for the production of chemicals\u0000and fuels. In this context, a wide range of renewable raw materials can be obtained from lignocellulosic\u0000biomass in both polymeric (i.e. cellulose, starch, lignin) and monomeric (i.e. sugars, polyols,\u0000phenols) forms. Lignin and its derivatives are interesting platform chemicals for industry, although\u0000mainly due to its refractory characteristics its use has been less considered compared to other biomass\u0000fractions. To take advantage of the potentialities of lignin, it is necessary to isolate it from the cellulose/\u0000hemicellulosic fraction, and then apply depolymerization processes; the overcoming of technical\u0000limitations being a current issue of growing interest for many research groups. In this review, significant\u0000data related to the structural characteristics of different types of commercial lignins are presented,\u0000also including extraction and isolation processes from biomass, and industrial feedstocks obtained as\u0000residues from paper industry under different treatments. The review mainly focuses on the different\u0000depolymerization processes (hydrolysis, hydrogenolysis, hydrodeoxygenation, pyrolysis) up to now\u0000developed and investigated analyzing the different hydrocarbons and aromatic derivatives obtained in\u0000each case, as well as the interesting reactions some of them may undergo. Special emphasis is done on\u0000the development of new catalysts and catalytic processes for the efficient production of fuels and\u0000chemicals from lignin. The possibilities of applications for lignin and its derivatives in new industrial\u0000processes and their integration into the biorefinery of the future are also assessed.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74626901","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: 6

Core-Magnetic Composites Catalysts for the Valorization and Up-grading of the Renewable Feedstocks: A Minireview 可再生原料增值升级用核磁复合催化剂的研究进展

Current Catalysis Pub Date : 2019-03-31 DOI: 10.2174/2211544708666181227152000

V. Coman

{"title":"Core-Magnetic Composites Catalysts for the Valorization and Up-grading of the Renewable Feedstocks: A Minireview","authors":"V. Coman","doi":"10.2174/2211544708666181227152000","DOIUrl":"https://doi.org/10.2174/2211544708666181227152000","url":null,"abstract":"\u0000\u0000Core-magnetic composites offer unique possibilities to accommodate adequate\u0000amounts of acid-base and redox functional sites and hence to catalyze the biomass conversion\u0000reactions in a one-pot way. Moreover, due to the dual functionality, the core-magnetic composites\u0000provide a bridge between homogeneous and heterogeneous catalysis. Hence, this minireview aims to\u0000offer a comprehensive account of remarkable recent applications of core-magnetic composites in the\u0000catalytic processes for biomass valorization.\u0000\u0000\u0000\u0000 A critical evaluation of synthetic methodologies utilized for the production of the magnetic\u0000nanoparticles, characterization techniques and catalytic applications is provided.\u0000\u0000\u0000\u0000The benefits of their utilization are exemplified by most representative examples of one-pot\u0000transformation of cellulose and upgrading processes. Other recent examples constitute the lignin\u0000fragmentation on magnetic iron oxide-based catalysts and the renewable crude glycerol up-grading\u0000using core-shell magnetic iron oxide bio-based materials.\u0000\u0000\u0000\u0000The review provides important information on the distinctive properties of the functionalized\u0000core-magnetic composites. Moreover, this review offers useful information affording a largescale\u0000production development, in terms of catalyst and reaction conditions, tailoring selectivity, and\u0000the potential to regenerate the catalysts.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86514230","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: 1

Synthesis of Cost-effective Trimetallic Oxide Nanocatalysts for the Reduction of Nitroarenes in Presence of NaBH4 in an Aqueous Medium 在NaBH4存在的水介质中合成高性价比的三金属氧化物纳米催化剂还原硝基芳烃

Current Catalysis Pub Date : 2019-03-31 DOI: 10.2174/2211544708666181129100631

A. Mukherjee, Mrinal K. Adak, A. Chowdhury, D. Dhak

{"title":"Synthesis of Cost-effective Trimetallic Oxide Nanocatalysts for the Reduction of Nitroarenes in Presence of NaBH4 in an Aqueous Medium","authors":"A. Mukherjee, Mrinal K. Adak, A. Chowdhury, D. Dhak","doi":"10.2174/2211544708666181129100631","DOIUrl":"https://doi.org/10.2174/2211544708666181129100631","url":null,"abstract":"\u0000\u0000To prevent the environmental pollution, the release of the carcinogenic\u0000reagents like nitroarenes, especially nitrobenzene must be reduced or to find a way to convert these\u0000hazardous materials into less harmful material. For the reduction of nitroarenes, various types of\u0000catalysts such as metal nanoparticles (mainly coinage and group VIII) and platinum group metals were\u0000used. The chemo/homo selectivity of the reduction of nitroarenes was tested mainly in an organic\u0000solvent medium.\u0000\u0000\u0000\u0000Trimetallic oxide nanocatalysts were prepared chemically and characterized via Thermogravimetric\u0000analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy FTIR),\u0000Scanning electron microscope (SEM) and solid UV studies. A series of nitroarenes were subjected to\u0000get their amine analogues using the NaBH4 in an aqueous medium using the synthesized catalysts. The\u0000completion of the reduction process was confirmed by the spectroscopic analysis.\u0000\u0000\u0000\u0000The average crystallite of the trimetallic oxide nanocatalysts was found to be 14-32nm. The\u0000reductions were selective (homo/chemo) and kinetics followed the Lindemann-Hinshelwood pseudofirst\u0000order kinetics with the rate constant in the order of 10-3 s-1. Hydroxylamine intermediate was\u0000found to be formed in the reduction procedure.\u0000\u0000\u0000\u0000The catalysts showed promising for the selectivity (homo/chemo). The reduction processes\u0000were less time consuming e.g. nitrobenzene took 10 mins and a series of nitroanilines required\u000035-40 s for the reduction. In short, the trimetallic nano-oxide catalysts possess fast reaction process,\u0000cost-effective, easy to handle, reusable and hence could be promising for industrial waste treatment.\u0000","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79730793","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: 10