Zirconia supported La, Co oxides and LaCoO3 perovskite:: structural characterization and catalytic CO oxidation

被引:34
作者
Colonna, S
De Rossi, S
Faticanti, M
Pettiti, I
Porta, P
机构
[1] Univ Roma La Sapienza, Dipartimento Chim, CNR, Ctr Studio Struttura & Attivita Catalit Sistemi O, I-00185 Rome, Italy
[2] CNR, Ist Struttura Mat, I-00133 Rome, Italy
关键词
zirconia-supported La; co perovskites; CO oxidation;
D O I
10.1016/S1381-1169(01)00422-8
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
ZrO2-supported La, Co oxide catalysts with different La, Co loading (2, 6, 8, 12 and 16 wt.% as LaCoO3) were prepared by impregnation of tetragonal ZrO2 with equimolar amounts of La and Co citrate precursors and calcination at 1073 K. The catalysts were characterized by X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and BET specific surface area determination. Catalytic CO oxidation was performed at 298-800 K. XRD revealed the presence of tetragonal zirconia with traces of the monoclinic phase. LaCoO3 perovskite was also detected for loading higher than 6%. XAS experiments suggested that at high loading LaCoO3 and CO3O4 were formed, while at low loading, La, Co oxide species interacting with support, and hard to be structurally defined, prevailed. The catalysis study evidenced that the catalytic activity was due to segregated and highly dispersed cobalt oxide species. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:161 / 168
页数:8
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