NO reduction by CO on the Pt(100) surface - A density functional theory study

被引:74
作者
Eichler, A
Hafner, J
机构
[1] Univ Vienna, Inst Mat Phys, A-1090 Vienna, Austria
[2] Univ Vienna, Ctr Computat Mat Sci, A-1090 Vienna, Austria
关键词
density functional calculations; models of surface chemical reactions; catalysis; oxidation; platinum; carbon monoxide; nitrogen oxides;
D O I
10.1006/jcat.2001.3366
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
NO reduction belongs to the most important reactions in environmental and industrial catalysis. In this study the NO reduction accompanied by the simultaneous oxidation of CO over a platinum catalyst is investigated on the basis of ab-initio calculations. The whole reaction cycle is broken up into several reaction steps (CO and NO adsorption, NO dissociation, N-2 desorption, CO oxidation, CO2 desorption). Each of these subprocesses is characterized by calculating transition state, adsorption/activation energy, prefactor, and rate constant, so that finally a consistent picture of the overall reaction on an atomistic scale is obtained. NO dissociation is found to be rate limiting with an activation barrier of EOact0 = 1.21 eV and a prefactor of v = 2.1 . 10(12) ML . s(-1); N-2 desor on is an essentially barrierless process, while the CO oxidation step itself can be described by an activation energy of E-act(0) = 0.83 eV and a prefactor of v = 2.0 . 10(12) ML . s(-1). (C) 2001 Academic Press.
引用
收藏
页码:118 / 128
页数:11
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