Influence of pretreatment conditions on low-temperature carbon monoxide oxidation over CeO2/Co3O4 catalysts

被引：142
作者：
Tang, Chih-Wei
Kuo, Chao-Chieh
Kuo, Ming-Chih
Wang, Chen-Bin [1 ]
Chien, Shu-Hua
机构：
[1] Natl Def Univ, Chung Cheng Inst Technol, Dept Appl Chem, Taoyuan 33509, Taiwan
[2] Acad Sinica, Inst Chem, Taipei 11529, Taiwan
[3] Natl Taiwan Univ, Dept Chem, Taipei 10764, Taiwan
来源：
APPLIED CATALYSIS A-GENERAL | 2006年 / 309卷 / 01期
关键词：
cobaltic oxide; ceria; CO oxidation;
D O I：
10.1016/j.apcata.2006.04.020
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 modification of ceria (CeO2) on high surface area cobaltic oxide (Co3O4) and the promotion effect of CO oxidation via different pretreatment conditions were studied. The high-valence cobalt oxide was prepared first by precipitation-oxidation in ice bath, followed by reduction at 230 C to get pure and high surface area cobaltic oxide (assigned as 8230, S-BET = 100 m(2) g(-1)). Further, the Ce20/R230 catalyst was prepared by impregnation with cerium nitrate (20% cerium loading). Pretreatment of Ce20/R230 catalyst was divided into two methods: reduction (under 200 and 400 degrees C) and calcination (under 350 and 550 degrees C). The catalysts were characterized by X-ray diffraction (XRD), infrared (IR), and diffuse reflectance spectroscopy (DRS), and temperature-programmed reduction (TPR) and by nitrogen adsorption at -196 degrees C. The results showed that pretreatment under low-temperatures obtained both larger surface area and better activity. The Ce20/R230-H200 catalyst exhibited the highest surface area (S-BET = 109 m(2) g(-1)) and the best catalytic activity in CO oxidation with T-50 (50% conversion) at 88 degrees C among series of catalysts due to the combined effect of cobaltic oxide and ceria. The optimized pretreatment of CeO2/Co3O4 catalysts can clearly enhance the catalytic activity. (c) 2006 Elsevier B.V. All rights reserved.
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页码：37 / 43
页数：7
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