Influence of the preparation procedure on the chemical and microstructural properties of lanthana promoted Rh/SiO2 catalysts - A FTIR spectroscopic study of chemisorbed CO

被引：16

作者：

Bernal, S ^{[1
]}

Blanco, G ^{[1
]}

Calvino, JJ ^{[1
]}

Cauqui, MA ^{[1
]}

RodriguezIzquierdo, JM ^{[1
]}

Vidal, H ^{[1
]}

机构：

[1] UNIV CADIZ,FAC CIENCIAS,DEPT CIENCIA MAT & INGN MET & QUIM INORGAN,CADIZ 11510,SPAIN

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1997年 / 250卷 / 1-2期

关键词：

supported metal; rhodium; lanthana; silica; FTIR spectroscopy; CO chemisorption; preparation;

D O I：

10.1016/S0925-8388(96)02835-6

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：

In this work, the influence of the preparation procedure on the chemical and microstructural properties of a series of Rh/La2O3/SiO2 catalysts has been investigated. The catalysts were characterized by using HREM, H-2 and CO volumetric adsorption and FTIR spectroscopy of chemisorbed CO. From our study, significant effects were observed for the following preparative variables: (a) the lanthana loading; (b) the way of introducing the metal and promoter, either consecutive (lanthana first and then the rhodium salt) or by co-impregnation; and (c) the calcination temperature (873 K or 1173 K) applied for preparing the La2O3/SiO2 intermediate phase onto which the noble metal was deposited.

引用

页码：461 / 466

页数：6

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