CO oxidation over promoted Pt catalysts

被引：116
|
作者：
Mergler, YJ [1 ]
vanAalst, A [1 ]
vanDelft, J [1 ]
Nieuwenhuys, BE [1 ]
机构：
[1] LEIDEN UNIV, LEIDEN INST CHEM, GORLAEUS LABS, NL-2300 RA LEIDEN, NETHERLANDS
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 1996年 / 10卷 / 04期
关键词：
CO oxidation; Pt-only catalyst; activity; models; ageing;
D O I：
10.1016/S0926-3373(96)00017-3
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 study of CO oxidation by O-2 over Pt catalysts, promoted by MnOx and CoOx, is described. The activities of Pt/SiO2, Pt/MnOx/SiO2 and Pt/CoOx/SiO2 are compared with commercial Pt/Al2O3, Pt/Rh/Al2O3 and Pt/CeOx/Al2O3 catalysts. Since these catalysts differ in dispersion and weight loading of platinum, the turnover frequencies are also compared. The following order in activity in CO oxidation after a reductive pretreatment is found: Pt/CoOx/SiO2 > Pt/MnOx/SiO2, Pt/CeOx/Al2O3 > Pt/Al2O3, Pt/Rh/Al2O3, Pt/SiO2. Over Pt/CoOx/SiO2 CO is already oxidised at room temperature. Possible models to account for the high activity of Pt/CoOx/SiO2 in the CO/O-2 reaction are presented and discussed. Partially reduced metal oxides are necessary to increase the activity of the Pt/CoOx/SiO2, Pt/MnOx/SiO2 or Pt/CeOx/Al2O3 catalysts. It was shown that mild ageing treatments did not affect the activity of the Pt/CoOx/SiO2 catalyst in CO oxidation.
引用
收藏
页码：245 / 261
页数：17
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