Effects of the addition of titania on the thermal characterization of alumina-supported palladium

被引：72

作者：

Wang, CB ^{[1
]}

Lin, HK ^{[1
]}

Ho, CM ^{[1
]}

机构：

[1] Natl Def Univ, Chung Cheng Inst Technol, Dept Appl Chem, Tao Yuan 33509, Taiwan

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2002年 / 180卷 / 1-2期

关键词：

palladium; thermal characterization; TG/DSC; TPR; TPD;

D O I：

10.1016/S1381-1169(01)00450-2

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 detailed thermal characterization of Pd/TiO2-Al2O3 catalysts under oxygen and hydrogen atmosphere was conducted by means of thermal gravimetric analysis/differential scanning calorimetry (TG/DSC), temperature-programmed reduction (TPR) and temperature-programmed desorption (TPD). A simultaneous TG/DSC measurement revealed that the heat evolved during oxygen adsorption at 25 degreesC varied slightly with the supports and had a higher value for the smaller palladium crystallite. Hydrogen chemisorption and BET measurements revealed that the coating of Pd/Al2O3 catalysts with titania modified the support character to achieve a high dispersion of palladium. TPR and TPD characterizations of oxidized samples further demonstrated that the coating of Pd/Al2O3 catalysts with titania promoted the reduction and decomposition of PdO into palladium. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：285 / 291

页数：7

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