Promoting Effect of Potassium and Calcium Additives to Cerium-Zirconium Oxide Catalysts for the Complete Oxidation of Carbon Monoxide

被引：10
|
作者：
Kaplin, I. Yu. [1 ]
Lokteva, E. S. [1 ]
Golubina, E. V. [1 ]
Maslakov, K. I. [1 ]
Chernyak, S. A. [1 ]
Lunin, V. V. [1 ]
机构：
[1] Moscow MV Lomonosov State Univ, Fac Chem, Moscow 119991, Russia
来源：
KINETICS AND CATALYSIS | 2017年 / 58卷 / 05期
关键词：
CO oxidation; cerium-zirconium oxide catalysts; promoting effect; K; Ca; OXYGEN STORAGE; MIXED OXIDES; SOOT COMBUSTION; SOLID-SOLUTIONS; CO OXIDATION; MODEL; XPS; GASIFICATION; REDUCTION; SURFACES;
D O I：
10.1134/S0023158417050081
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 effect of potassium and calcium additives on the catalytic activity of the Ce0.8Zr0.2O2 system in the reaction of CO oxidation was studied. With the use of X-ray diffraction analysis, it was found that the Ce0.8Zr0.2O2 and Ce0.8Zr0.2O2-Ca,K samples contained a mixed oxide of cerium and zirconium; the presence of the independent phases of potassium and calcium compounds in the modified system was not detected. With the use of the low-temperature adsorption-desorption of nitrogen, X-ray photoelectron spectroscopy, and temperature-programmed reduction, it was established that the Ce0.8Zr0.2O2-Ca,K system (in spite of the fact that its specific surface area was lower than that of Ce0.8Zr0.2O2) contained more active oxygen on the surface; peroxide and superoxide complexes formed upon the chemisorption of O-2 can act as active oxygen species. This can be the reason for a higher efficiency of the Ce0.8Zr0.2O2-Ca,K system in comparison with that of the unmodified oxide. The results obtained indicate that the ash impurities of Ca and K can increase the catalytic activity of the biomorphic mixed oxides Ce0.8Zr0.2O2 prepared with the use of sawdust as a template.
引用
收藏
页码：585 / 592
页数：8
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