XPS and TPR examinations of γ-alumina-supported Pd-Cu catalysts

被引：249
作者：
Batista, J
Pintar, A
Mandrino, D
Jenko, M
Martin, V
机构：
[1] Natl Inst Chem, SI-1001 Ljubljana, Slovenia
[2] Inst Met & Technol, SI-1001 Ljubljana, Slovenia
[3] Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France
来源：
APPLIED CATALYSIS A-GENERAL | 2001年 / 206卷 / 01期
关键词：
supported Pd-Cu catalysts; gamma-kind alumina; Pd-Cu bimetallic clusters; X-ray photoelectron spectroscopy (XPS); temperature-programmed reduction (TPR);
D O I：
10.1016/S0926-860X(00)00589-5
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：
Alumina-supported palladium-copper catalysts, which promote liquid-phase nitrate reduction, have been prepared according to different impregnation sequences of gamma -Al2O3 support and characterized by X-ray photoelectron spectroscopy (XPS), X-ray induced Auger electron spectroscopy (XAES) and temperature-programmed reduction (TPR). Analysis of Pd XPS/XAES spectra reveals that palladium is present on the gamma -alumina support in the metallic form. Copper is reduced at lower temperatures in the presence of palladium particles compared to the CuO/gamma -Al2O3 sample. Due to the low copper content in catalysts (sigma (Cu)approximate to 10(14) atoms cm(-2)), the XPS/XEAS spectral features of reduced copper species are quite different from those of bulk copper. As shown by TPR and XPS/XAES data, formation of highly dispersed Pd-Cu bimetallic clusters is suggested. It was discovered by means of TPR analysis that the catalyst preparation in which the gamma -alumina support is impregnated first by copper salt, results in higher formation of the Pd-Cu alloy. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：113 / 124
页数：12
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