Kinetic and activity study of CO oxidation over CuO-MnOx-CeO2 catalysts

被引：19

作者：

Jia, Ai-Ping ^{[1
]}

Deng, Yun ^{[1
]}

Hu, Geng-Shen ^{[1
]}

Luo, Meng-Fei ^{[1
]}

Lu, Ji-Qing ^{[1
]}

机构：

[1] Zhejiang Normal Univ, Key Lab, Minist Educ Adv Catalysis Mat, Inst Phys Chem, Jinhua 321004, Peoples R China

来源：

REACTION KINETICS MECHANISMS AND CATALYSIS | 2016年 / 117卷 / 02期

基金：

美国国家科学基金会;

关键词：

CO oxidation; CuO-MnOx-CeO2; catalysts; CuO dispersion; Oxygen vacancy; Kinetics; CUO-BASED CATALYSTS; PREFERENTIAL OXIDATION; SELECTIVE OXIDATION; CUO-CEO2; CATALYSTS; EXCESS HYDROGEN; CUO/CEO2; H-2-RICH GASES; OXIDE CATALYST; MIXED OXIDES; REDOX PROPERTIES;

D O I：

10.1007/s11144-015-0947-8

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：

Three CuO-MnOx-CeO2 catalysts with different impregnation sequences (i.e. MnOx/CuO/CeO2, CuO/MnOx/CeO2 and CuO-MnOx/CeO2) were prepared and the effects of impregnation sequences on the structures and catalytic behaviors of these catalysts were investigated. It was found that the MnOx/CuO/CeO2 possessed the largest amount of oxygen vacancies but the lowest reducibility; the CuO/MnOx/CeO2 had the largest Cu+ contents but the lowest amount of oxygen vacancies; the CuO-MnOx/CeO2 catalyst had the highest CuO dispersion and the best reducibility, along with moderate amount of oxygen vacancies and Cu+ contents on the surface. The kinetic studies revealed that the apparent activation energies of CO oxidation over the CuO-MnOx/CeO2, MnOx/CuO/CeO2 and CuO/MnOx/CeO2 were 49.5, 51.8 and 73.8 kJ mol(-1), in order, and the activities followed an order of CuO-MnOx/CeO2 > MnOx/CuO/CeO2 > CuO/MnOx/CeO2. The highest performance of the CuO-MnOx/CeO2 was ascribed to the highly dispersed CuO species and the mobility of lattice oxygen.

引用

页码：503 / 520

页数：18

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