The effect of Pd precursor and pretreatment on the adsorption and absorption behavior of supported Pd catalysts

被引：67

作者：

Krishnankutty, N ^{[1
]}

Li, J ^{[1
]}

Vannice, MA ^{[1
]}

机构：

[1] Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA

来源：

APPLIED CATALYSIS A-GENERAL | 1998年 / 173卷 / 02期

基金：

美国国家科学基金会;

关键词：

carbon-supported palladium catalysts; carbon contamination; hydrogen; oxygen and carbon monoxide chemisorption; Pd hydride formation;

D O I：

10.1016/S0926-860X(98)00173-2

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 behavior of carbon- and silica-supported Pd catalysts made from Pd acetylacetonate was compared to each other and also to carbon-supported Pd prepared from PdCl2. Suppressed chemisorption and hydride formation was observed after standard hydrogen reduction pretreatments at 573 K which was attributed to carbon contamination of the Pd bulk and surface. Different treatments with oxygen in addition to pretreatment sequences with and without hydrogen reduction followed by hydrogen, oxygen and carbon monoxide chemisorption or hydrogen and oxygen titration measurements were used to clarify the source of the carbon contaminant. Initial contamination due to the Pd(AcAc)(2) precursor was observed but it could be removed by calcination at 573 K in 4% oxygen; however, subsequent recontamination during reduction in hydrogen indicated that carbon atoms from the support could also be involved. Protecting the Pd surface with chemisorbed oxygen by cooling in oxygen prevented this carbon contamination. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：137 / 144

页数：8

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