Some insight into the effects of oxygen diffusion in the reduction kinetics of ceria

被引：28

作者：

Giordano, F

Trovarelli, A

de Leitenburg, C

Dolcetti, G

Giona, M

机构：

[1] Univ Roma La Sapienza, Dipartimento Ingn Chim, I-00184 Rome, Italy

[2] Univ Udine, Dipartimento Sci & Tecnol Chim, I-33100 Udine, Italy

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2001年 / 40卷 / 22期

关键词：

D O I：

10.1021/ie010105q

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The aim of this paper is to discuss the main features of the temperature-programmed reduction of high-surface-area ceria in the low-temperature range (T < 900 X) with particular emphasis on the role of oxygen diffusion. By making use of a cell model for the reaction/diffusion process, it is shown that the observed kinetics is not influenced by oxygen diffusion within the lattice for the values of oxygen diffusivity available for ceria. This result enables us to develop a simple and spatially uniform kinetic model for ceria reduction. The effects of sintering and surface area are also briefly addressed.

引用

页码：4828 / 4835

页数：8

共 20 条

[1]

[Anonymous], 1968, PROCESS ANAL SIMULAT

[2] HYDROGEN CHEMISORPTION ON CERIA - INFLUENCE OF THE OXIDE SURFACE-AREA AND DEGREE OF REDUCTION [J].