Rhodium dispersion in a Rh/Ce0.68Zr0.32O2 catalyst investigated by HRTEM and H2 chemisorption

被引：75

作者：

Gatica, JM

Baker, RT

Fornasiero, P

Bernal, S

Blanco, G

Kaspar, J

机构：

[1] Univ Trieste, Dipartimento Sci Chim, I-34127 Trieste, Italy

[2] Univ Cadiz, Fac Ciencias, Dept Ciencia Mat Ingn Met & Quim Inorgan, E-11510 Puerto Real, Spain

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 19期

关键词：

D O I：

10.1021/jp994101z

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 effect of reduction temperature on the hydrogen adsorption and Rh dispersion in a Rh/Ce0.68Zr0.32O2 catalyst with texturally stable Ce0.68Zr0.32O2 support was investigated. Rh dispersion data were also obtained from Rh particle size analyses made using high-resolution transmission electron microscopy (HRTEM) images. Comparison of the dispersion values obtained by using the two techniques showed that Hz adsorption at -80 degrees C is a suitable tool for the estimation of Rh dispersion at reduction temperature, T-red, less than or equal to 500 degrees C. For T-red > 500 degrees C, a partial suppression of H-2 chemisorption was observed. However, after a mild reoxidation and low temperature reduction, the H-2 adsorption capacity of these samples was regenerated and good agreement with the HRTEM data was again obtained.

引用

页码：4667 / 4672

页数：6

共 30 条

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