Size Effects in Ethylene Oxidation on Silver Catalysts: Influence of Support and Cs Promoter Full article
Journal |
Applied Catalysis A: General
ISSN: 0926-860X , E-ISSN: 1873-3875 |
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Output data | Year: 1995, Volume: 126, Number: 1, Pages: 67-84 Pages count : 18 DOI: 10.1016/0926-860X(95)00036-4 | ||
Tags | Ethylene epoxidation, Ethylene π-complex, Silver catalyst, Silver particle size distribution, Size effect | ||
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Affiliations |
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Abstract:
A new method for preparing supported silver catalysts with a narrow particle size distribution has been developed. For crystals with a diameter ranging from 100 to 1000 Å the dependencies of reaction rates on size have been studied for epoxidation and deep oxidation of ethylene. For particles 300–500 Å in size the reaction rate was found to increase sharply. The concentration of ethylene π-complexes with Ag+ cations increased proportionally to the reaction rate. These π-complexes are assumed to be the only intermediates directing the reaction towards epoxidation. The ratio of the reaction rate to the concentration of π-complexes was found to remain constant within a wide range of Ag crystal sizes including bulk silver samples. The influence of the support (α-Al2O3, SiO2) on the size effect relates to the secondary processes of ethylene oxide conversion. The factors that cause the catalytic size effect and the promoting effect of Cs are discussed.
Cite:
Goncharova S.N.
, Paukshtis E.A.
, Bal'zhinimaev B.S.
Size Effects in Ethylene Oxidation on Silver Catalysts: Influence of Support and Cs Promoter
Applied Catalysis A: General. 1995. V.126. N1. P.67-84. DOI: 10.1016/0926-860X(95)00036-4 WOS Scopus РИНЦ
Size Effects in Ethylene Oxidation on Silver Catalysts: Influence of Support and Cs Promoter
Applied Catalysis A: General. 1995. V.126. N1. P.67-84. DOI: 10.1016/0926-860X(95)00036-4 WOS Scopus РИНЦ
Dates:
Submitted: | May 13, 1994 |
Accepted: | Feb 6, 1995 |
Published print: | May 25, 1995 |
Published online: | Nov 18, 1999 |
Identifiers:
Web of science | WOS:A1995RC96300005 |
Scopus | 2-s2.0-0029306773 |
Elibrary | 31575364 |
Chemical Abstracts | 1995:569031 |
Chemical Abstracts (print) | 123:32505 |
OpenAlex | W2050581614 |