Oxidation behavior of alumina-supported platinum metal catalysts

被引：29
|
作者：
Wang, CB [1 ]
Yeh, CT
机构：
[1] Natl Def Univ, Chung Cheng Inst Technol, Dept Appl Chem, Tao Yuan 33509, Taiwan
[2] Natl Tsing Hua Univ, Dept Chem, Hsinchu 30043, Taiwan
来源：
APPLIED CATALYSIS A-GENERAL | 2001年 / 209卷 / 1-2期
关键词：
palladium; platinum; rhodium; heat of adsorption; calorimetry; oxidation;
D O I：
10.1016/S0926-860X(00)00746-8
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：
Heats of adsorption of dioxygen and oxidation phenomena of supported platinum metals (Pd, Pt and Rh) have been investigated by a simultaneous TG-DSC technique over a wide temperature range between 280 and 900 K. The oxidation proceeds in three consecutive stages, i.e. surface adsorption (T < 300 K), progressive penetration of adsorbed oxide ions into bulk (300-700 K), and complete oxidation to form stable oxides (700-900 K) for Pd/Al2O3 and Rh/Al2O3 catalysts. For Pt/Al2O3, in the same temperature range, the surface oxide was decomposed when T > 800 K. The crystallite sizes of supported platinum metals have a profound effect on the heats of adsorption (DeltaH(ad)), heats of stable oxide formation (DeltaH(f)) and formation of oxide species. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：1 / 9
页数：9
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