Catalytic activity of LaMnO3 and LaCoO3 perovskites towards VOCs combustion

被引：214

作者：

Spinicci, R ^{[1
]}

Faticanti, M ^{[1
]}

Marini, P ^{[1
]}

De Rossi, S ^{[1
]}

Porta, P ^{[1
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Chim, Ist IMIP, CNR,Sez Mat Inorgan & Catalisi Eterogenea, I-00185 Rome, Italy

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2003年 / 197卷 / 1-2期

关键词：

LaMnO3; LaCoO3; perovskites; VOCs catalytic oxidation; oxygen adsorption on perovskites; oxygen desorption on perovskites;

D O I：

10.1016/S1381-1169(02)00621-0

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 catalytic combustion of some volatile organic compounds (VOCs) has been investigated over LaMnO3 and LaCoO3 perovskite-type oxides. Redox titration has shown that cobalt is present in LaCoO3 exclusively in the 3+ oxidation state whereas LaMnO3 contains considerable amount of Mn4+ (35%) in addition to Mn3+. VOCs reactivity towards total oxidation follows the trend: acetone > isopropanol > benzene. The oxidation of isopropanol occurs through the formation of acetone in the homogeneous reaction. The increase of the oxygen partial pressure is beneficial for total oxidation of acetone. The adsorptive properties of the catalysts towards the VOCs and H-2 have been examined by means of temperature programmed desorption. The LaMnO3 surface is the most reactive to the adsorption of VOCs and H-2. The role of the adsorbed oxygen has been studied by examining the variations of the electrical conductivity of the catalysts during the processes of oxygen adsorption-desorption. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：147 / 155

页数：9

共 16 条

[1] ENVIRONMENTAL CATALYSIS [J].