Mechanism of the dissociative chemisorption of methane over Ir(110): Trapping-mediated or direct?

被引：59

作者：

Seets, DC

Wheeler, MC

Mullins, CB

机构：

[1] Department of Chemical Engineering, University of Texas at Austin, Austin

来源：

CHEMICAL PHYSICS LETTERS | 1997年 / 266卷 / 5-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(97)00043-2

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：

A controversy exists regarding the dominant mechanism in the reaction of methane over transition metals. We present new insight regarding this subject by: (1) providing the first unambiguous evidence for the chemisorption of methane by a trapping-mediated mechanism; (2) demonstrating, with unprecedented accuracy, agreement between bulb measurements of reaction probability and determinations employing molecular beam techniques, and (3) quantifying the contributions of differing mechanisms as a function of experimental conditions. Our results show conclusively that a trapping-mediated mechanism dominates dissociative chemisorption of methane over Ir(110) at low gas temperatures and that a direct mechanism dominates at high gas temperatures.

引用

页码：431 / 436

页数：6

共 29 条

[1] KINETICS OF THE ACTIVATED DISSOCIATIVE ADSORPTION OF METHANE ON THE LOW INDEX PLANES OF NICKEL SINGLE-CRYSTAL SURFACES [J].