PROMOTION OF CATALYTIC REACTIONS BY DEPOPULATION OF SURFACE-STATES

被引：43
作者：
BERTEL, E
ROOS, P
LEHMANN, J
机构：
[1] Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85740 Garching
来源：
PHYSICAL REVIEW B | 1995年 / 52卷 / 20期
关键词：
D O I：
10.1103/PhysRevB.52.R14384
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Dissociative adsorption is the rate-determining step in many catalytic reactions. However, the promoting mechanisms for dissociative adsorption are not yet fully understood. It is shown here that electronic surface states influence the physisorption potential as well as the dissociation barrier. Additives are able to shift and populate or depopulate surface states. Consequently, dissociation is inhibited or promoted, respectively. The present model provides a consistent explanation for several experimentally observed promoting and poisoning effects in dissociative adsorption of molecules from the gas phase or from a physisorbed precursor state.
引用
收藏
页码：14384 / 14387
页数：4
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