Origin of the high activity and stability of Co3O4 in low-temperature CO oxidation

被引：85

作者：

Wang, Yong-Zhao ^{[1
]}

Zhao, Yong-Xiang ^{[1
]}

Gao, Chun-Guang ^{[1
]}

Liu, Dian-Sheng ^{[1
]}

机构：

[1] Shanxi Univ, Sch Chem & Chem Engn, Engn Res Ctr, Minist Educ Fine Chem, Taiyuan 030006, Peoples R China

来源：

CATALYSIS LETTERS | 2008年 / 125卷 / 1-2期

关键词：

Co(3)O(4); low-temperature CO oxidation; catalytic activity; active oxygen species;

D O I：

10.1007/s10562-008-9531-4

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 paper, the Co(3)O(4) catalysts prepared by the liquid phase precipitation method were investigated with respect to their activity and stability in CO oxidation reaction. The Co(3)O(4) catalysts were comparatively investigated by thermal gravimetry analysis (TG-DTG), X-ray powder diffraction (XRD), N(2) adsorption, CO titration and O(2)-temperature program desorption (O(2)-TPD). The results of XRD show that all the catalysts exist as a pure Co(3)O(4) phase with the spinel structure. The high catalytic activity observed at ambient temperature is followed by a gradual decrease. The CO titration experiments show that the Co(3)O(4) catalysts possess active oxygen species. The total amount of active oxygen species and the specific surface area decrease with increasing calcination temperature. The O(2)-TPD results indicate that O(2)(-) and O(-) are the possible active oxygen species.

引用

页码：134 / 138

页数：5

共 36 条

[21] In situ FTIR study of cobalt oxides for the oxidation of carbon monoxide [J].