学术探索
学术期刊
新闻热点
数据分析
智能评审

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.
引用
收藏
页码：113 / 124
页数：12
相关论文
共 37 条
[1]   XPS SURFACE CHARACTERIZATION OF A CU/SIO2 CATALYST OXIDIZED BY NO OR O2 [J].
BALKENENDE, AR ;
VANKOOTEN, WEJ ;
PIETERS, AR ;
LAMERS, M ;
JANSSEN, FJJG ;
GEUS, JW .
APPLIED SURFACE SCIENCE, 1993, 68 (03) :439-444
[2]   Characterization of supported Pd-Cu bimetallic catalysts by SEM, EDXS, AES and catalytic selectivity measurements [J].
Batista, J ;
Pintar, A ;
Ceh, M .
CATALYSIS LETTERS, 1997, 43 (1-2) :79-84
[3]   THE INFLUENCE OF A 2ND METAL COMPONENT (CU, SN, FE) ON PD/SIO2 ACTIVITY IN THE HYDROGENATION OF 2,4-DINITROTOLUENE [J].
BENEDETTI, A ;
FAGHERAZZI, G ;
PINNA, F ;
RAMPAZZO, G ;
SELVA, M ;
STRUKUL, G .
CATALYSIS LETTERS, 1991, 10 (3-4) :215-223
[4]   CHEMICAL STATE AND REACTIVITY OF SUPPORTED PALLADIUM .1. CHARACTERIZATION BY XPS AND UV-VISIBLE SPECTROSCOPY [J].
BOZONVERDURAZ, F ;
OMAR, A ;
ESCARD, J ;
PONTVIANNE, B .
JOURNAL OF CATALYSIS, 1978, 53 (01) :126-134
[5]  
CANNER WC, 1995, CHEM REV, V95, P759
[6]   ELECTRONIC-STRUCTURE OF COPPER PARTICLES SUPPORTED ON TIO2, GRAPHITE, AND AL2O3 SUBSTRATES - A COMPARATIVE-STUDY [J].
CARLEY, AF ;
RAJUMON, MK ;
ROBERTS, MW .
JOURNAL OF SOLID STATE CHEMISTRY, 1993, 106 (01) :156-163
[7]   Catalytic selective reduction of NO with propylene over Cu-Al2O3 catalysts:: influence of catalyst preparation method [J].
Chen, LY ;
Horiuchi, T ;
Osaki, T ;
Mori, T .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1999, 23 (04) :259-269
[8]   Determining the nature of the active sites of Cu-beta zeolites for the selective catalytic reduction (SGR) of NOx by using a coupled reaction XAES/XPS study [J].
Corma, A ;
Palomares, A ;
Marquez, F .
JOURNAL OF CATALYSIS, 1997, 170 (01) :132-139
[9]   Catalytic reduction of nitrates and nitrites in water solution on pumice-supported Pd-Cu catalysts [J].
Deganello, F ;
Liotta, LF ;
Macaluso, A ;
Venezia, AM ;
Deganello, G .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2000, 24 (3-4) :265-273
[10]   TPR and XRD studies of yttria-doped ceria/γ-alumina-supported copper oxide catalyst [J].
Dow, WP ;
Wang, YP ;
Huang, TJ .
APPLIED CATALYSIS A-GENERAL, 2000, 190 (1-2) :25-34
1234