Surface diffusion upon oxygen isotopic exchange on oxide-supported metal nanoclusters

被引：26
|
作者：
Galdikas, A
Descorme, C
Duprez, D
机构：
[1] Kaunas Univ Technol, Dept Phys, LT-3031 Kaunas, Lithuania
[2] Lab Catalyse & Chim Organ, F-86022 Poitiers, France
来源：
SOLID STATE IONICS | 2004年 / 166卷 / 1-2期
关键词：
catalysis; nanoclusters; reactions; kinetics; surface diffusions; oxide; isotopic exchange;
D O I：
10.1016/j.ssi.2003.11.002
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 newly developed real-time kinetic model is presented. The model was used for the characterization of supported metal catalysts' properties in the oxygen isotopic exchange reaction. This model is based on rate equations and includes several elementary processes: adsorption on the metal nanoclusters, reactions on the metal nanoclusters, desorption from the metal nanoclusters, surface and bulk diffusion on/in the oxide support and direct exchange with the gas phase. On the basis of this model, a computer code was developed to determine the kinetic and thermodynamic parameters of the oxygen isotopic exchange reactions. The characteristics of a Rh/CeO2 catalyst were examined in the temperature range between 200 and 450 degreesC. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：147 / 155
页数：9
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