{"title":"The Mechanism of HDS Catalysis","authors":"A. N. Startsev","doi":"10.1080/01614949508006446","DOIUrl":null,"url":null,"abstract":"Introduction The mechanism of heterogeneous catalytic reactions is much more difficult to elucidate than that of homogeneous systems. Despite the facilities provided by physical methods for investigating the surface of solids, obtaining detailed information on the structure of the active component in real heterogeneous catalysts presents difficulties due to the nonuniform chemical composition of the surface species. Some of these surface species are totally inactive in catalysis, and others can catalyze the given chemical reaction by different pathways and according to different mechanisms. This results in a change of selectivity to the desired product and the appearance of intermediates and reaction by-products. Furthermore, the effect of the reaction medium on the catalyst gains importance during a catalytic process when, at high temperature and pressure, one type of surface species is transformed into another, thus changing the mechanism and direction of the catalyzed reaction. ∗ Telex: 133122 Sovet SU...","PeriodicalId":50986,"journal":{"name":"Catalysis Reviews-Science and Engineering","volume":"90 6 1","pages":"353-423"},"PeriodicalIF":9.3000,"publicationDate":"1995-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"190","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catalysis Reviews-Science and Engineering","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1080/01614949508006446","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 190
Abstract
Introduction The mechanism of heterogeneous catalytic reactions is much more difficult to elucidate than that of homogeneous systems. Despite the facilities provided by physical methods for investigating the surface of solids, obtaining detailed information on the structure of the active component in real heterogeneous catalysts presents difficulties due to the nonuniform chemical composition of the surface species. Some of these surface species are totally inactive in catalysis, and others can catalyze the given chemical reaction by different pathways and according to different mechanisms. This results in a change of selectivity to the desired product and the appearance of intermediates and reaction by-products. Furthermore, the effect of the reaction medium on the catalyst gains importance during a catalytic process when, at high temperature and pressure, one type of surface species is transformed into another, thus changing the mechanism and direction of the catalyzed reaction. ∗ Telex: 133122 Sovet SU...
非均相催化反应的机理比均相催化反应的机理更难阐明。尽管物理方法为研究固体表面提供了便利,但由于表面物质的化学组成不均匀,获得实际非均相催化剂中活性成分结构的详细信息存在困难。这些表面物质有的完全不具有催化活性,有的则可以通过不同的途径,根据不同的机理催化给定的化学反应。这导致对期望产物的选择性改变以及中间产物和反应副产物的出现。此外,在高温高压催化过程中,当一种表面物质转化为另一种表面物质,从而改变催化反应的机理和方向时,反应介质对催化剂的影响就显得尤为重要。*电传:133122 Sovet SU…
期刊介绍:
Catalysis Reviews is dedicated to fostering interdisciplinary perspectives in catalytic science and engineering, catering to a global audience of industrial and academic researchers. This journal serves as a bridge between the realms of heterogeneous, homogeneous, and bio-catalysis, providing a crucial and critical evaluation of the current state of catalytic science and engineering. Published topics encompass advances in technology and theory, engineering and chemical aspects of catalytic reactions, reactor design, computer models, analytical tools, and statistical evaluations.