The first measurement of an absolute surface concentration of reaction intermediates in ethylene hydrogenation

被引：59

作者：

Cremer, PS

Su, XC

Shen, YR

Somorjai, GA

机构：

[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720

[2] UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720

来源：

CATALYSIS LETTERS | 1996年 / 40卷 / 3-4期

关键词：

absolute surface intermediate concentration; ethylene hydrogenation; reaction intermediates in catalysis;

D O I：

10.1007/BF00815274

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 first measurement of a turnover rate with respect to surface intermediate concentration in a high pressure heterogeneous catalytic reaction is reported. By using infrared-visible sum frequency generation to study the hydrogenation of ethylene on Pt(111), it was found that the surface concentration of pi-bonded ethylene, the key reaction intermediate, represented approximately 4% of a monolayer. Thus the absolute turnover rate per surface adsorbed ethylene molecule is 25 times faster than the rate measured per platinum atom. To explain these results, we propose a model of weakly adsorbed ethylene intermediates reacting on atop sites.

引用

收藏

页码：143 / 145

页数：3

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