Microcalorimetric study of ethylene adsorption on the Pt{111} surface

被引：65

作者：

Yeo, YY

Stuck, A

Wartnaby, CE

King, DA

机构：

[1] Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, Lensfield Road

[2] ABB Corporate Research

[3] Pi Technology Ltd., Milton Hall, Milton, Cambridge CB4 6AB, Church Lane

来源：

CHEMICAL PHYSICS LETTERS | 1996年 / 259卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(96)00787-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The reaction of C2H4 on Pt{111} at 300 K has been investigated by single crystal adsorption calorimetry. The initial heats of adsorption and the initial sticking probability are 174 kJ/mol and 0.67 respectively. The adsorption heat versus coverage data shows a remarkable minimum which serves as a basis for a mechanism involving ethylidene (CHCH3) as an intermediate for the formation of ethylidyne (C2H2) on the Pt{III} surface. The coverage-dependent sticking probability strongly indicates that adsorption is precursor mediated and is well-fitted by the King and Wells expression. From the structure of the decomposition species known to form on the Pt{III} surface, the average C-Pt bond strength is found to be about 245 kJ/mol, although the actual value is found to be species-dependent.

引用

页码：28 / 36

页数：9

共 34 条

[21] THEORETICAL-STUDIES OF OXIDATIVE ADDITION AND REDUCTIVE ELIMINATION .3. C-H AND C-C REDUCTIVE COUPLING FROM PALLADIUM AND PLATINUM BIS(PHOSPHINE) COMPLEXES [J].