W. Reschetilowski, U. Mroczek, K.-H. Steinberg, K.-P. Wendlandt
{"title":"Influence of platinum dispersion on the ethane aromatization on Pt/H-ZSM-5 zeolites","authors":"W. Reschetilowski, U. Mroczek, K.-H. Steinberg, K.-P. Wendlandt","doi":"10.1016/0166-9834(91)80110-I","DOIUrl":null,"url":null,"abstract":"<div><p>The influence of the platinum dispersion and of the metal particle size distribution on the catalytic activity in the ethane aromatization over Pt/H-ZSM-5 zeolites was investigated at 823 K in a plug flow reactor. Comparatively high platinum dispersion and low average particle size caused by impregnation of the zeolite with ethanolic H<sub>2</sub>PtCl<sub>6</sub> solution lead to a close vicinity of metal and acid sites which is accompanied by an increased electrophilicity of the metal. Such a catalyst posesses a higher deactivation rate than those with more bulky platinum. The rapid deactivation is effected by a higher stability of the chemisorption complex metal-ethylene and by favouring of consecutive reactions of olefinic intermediates towards coke information.</p></div>","PeriodicalId":8091,"journal":{"name":"Applied Catalysis","volume":"78 2","pages":"Pages 257-264"},"PeriodicalIF":0.0000,"publicationDate":"1991-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0166-9834(91)80110-I","citationCount":"18","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Catalysis","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/016698349180110I","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 18
Abstract
The influence of the platinum dispersion and of the metal particle size distribution on the catalytic activity in the ethane aromatization over Pt/H-ZSM-5 zeolites was investigated at 823 K in a plug flow reactor. Comparatively high platinum dispersion and low average particle size caused by impregnation of the zeolite with ethanolic H2PtCl6 solution lead to a close vicinity of metal and acid sites which is accompanied by an increased electrophilicity of the metal. Such a catalyst posesses a higher deactivation rate than those with more bulky platinum. The rapid deactivation is effected by a higher stability of the chemisorption complex metal-ethylene and by favouring of consecutive reactions of olefinic intermediates towards coke information.
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