IDENTIFICATION OF THE STATE OF PALLADIUM IN VARIOUS HYDROGENATION CATALYSTS BY XPS

被引：66

作者：

NOACK, K ^{[1
]}

ZBINDEN, H ^{[1
]}

SCHLOGL, R ^{[1
]}

机构：

[1] FRITZ HABEL INST,W-1000 BERLIN 33,GERMANY

来源：

CATALYSIS LETTERS | 1990年 / 4卷 / 02期

关键词：

CO oxidation; hydrogenation; Lindlar catalyst; Madelung shift; Pd 3d binding energy; Pd/Al[!sub]2[!/sub]O[!sub]3[!/sub; Pd/CaCO[!sub]3[!/sub; Pd/SiO[!sub]2[!/sub] Pd/C;

D O I：

10.1007/BF00765697

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：

Various commercial supported palladium hydrogenation catalysts were studied by XPS and treated at ambient pressure with hydrogen and air. Unused catalysts exhibit a significant fraction of divalent Pd (oxide) which is reduced by hydrogen treatment at room temperature. Exposure to air in systems with carbonate, alumina, silica or active carbon as support causes the formation of a solid solution of oxygen in Pd characterized by a Pd 3d chemical shift of ca. + 0.4 eV. The absolute binding energy of Pd depends strongly on the matrix, indicating a significant contribution of extra-atomic screening, which prevents a direct comparison of reference samples and supported catalysts. Using the oxidation of CO to CO2 at 300 K as in situ chemical probe it was confirmed that Pd supported on carbonate, silica and alumina exists in the same metallic state which could be activated for the test reaction irrespective of the variation in XPS binding energies. © 1990 J.C. Baltzer A.G. Scientific Publishing Company.

引用

页码：145 / 156

页数：12

共 8 条

[1] INTERACTION OF OXYGEN AND HYDROGEN WITH PALLADIUM [J].