Synthesis, characterization and catalytic oxidation of carbon monoxide over cobalt oxide

被引：200
作者：
Lin, HK
Chiu, HC
Tsai, HC
Chien, SH [1 ]
Wang, CB
机构：
[1] Acad Sinica, Inst Chem, Taipei 11529, Taiwan
[2] Natl Def Univ, Chung Cheng Inst Technool, Dept Appl Chem, Taoyuan 33509, Taiwan
[3] Natl Taiwan Univ, Dept Chem, Taipei 10764, Taiwan
来源：
CATALYSIS LETTERS | 2003年 / 88卷 / 3-4期
关键词：
cobalt oxide; TPR; CO oxidation;
D O I：
10.1023/A:1024013822986
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：
A mix-valenced cobalt oxide, CoOx, was prepared from cobalt nitrate aqueous solution through a precipitation with sodium hydroxide and an oxidation by hydrogen peroxide. Further, other pure cobalt oxide species were refined from the CoOx by temperature-programmed reduction (TPR) at 170, 230 and 300 degreesC (labeled as R-170, R-230 and R-300, respectively). They were characterized by X-ray (XRD), infrared (IR), thermogravimetry (TG) and TPR. The major composition of CoOx is CoO(OH), with a small amount of Co4+ species; R-170 is CoO(OH) with a hexagonal structure; R-230 is Co3O4 with a spinel structure and R-300 is CoO with a cubic structure. Their catalytic activities toward the CO oxidation were further studied in a continuous flow microreactor. The results indicated that the relative activity decreased significantly with the oxidation state of cobalt, i.e., CoO (+2) greater than or similar to Co3O4 (+8/3) >> CoO(OH) (+3) greater than or similar to CoOx (> +3).
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页码：169 / 174
页数：6
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