THE KINETICS OF H-2 DISSOCIATIVE CHEMISORPTION - THE ROLE OF TRANSIENTS

被引:10
作者
CHAKRAVARTY, C [1 ]
METIU, H [1 ]
机构
[1] UNIV CALIF SANTA BARBARA, DEPT CHEM, SANTA BARBARA, CA 93106 USA
关键词
D O I
10.1063/1.468966
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 Lee-DePristo model for the dissociative chemisorption of H2 on Ni(100) has an interesting behavior. The potential energy surface has a minimum corresponding to a molecular, physisorbed state. This minimum is shallow and at 300 K the lifetime of physisorbed H2 is extremely short. One is then justified in treating the kinetics as a direct dissociation and ignoring physisorption. At 100 K physisorbed H2 has a long lifetime and one is forced to consider a two-step kinetics: H2 is first physisorbed and then dissociated. While chemical kinetics describes easily these two limiting cases, it offers little guidance for the intermediate temperature. We show here how the correlation function theory deals with this situation by providing equations which cover all temperature regimes. The theory is general and can be used in all cases when intermediates with shallow wells participate in the reaction mechanism. © 1995 American Institute of Physics.
引用
收藏
页码:8643 / 8655
页数:13
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