REACTANT INDUCED RESTRUCTURING AND CORROSION OF GERMANIUM PALLADIUM CATALYSTS DURING HYDROGENATION REACTIONS

被引：6
作者：
BODNAR, Z
MALLAT, T
BAIKER, A
机构：
[1] Department of Chemical Engineering and Industrial Chemistry, Swiss Federal Institute of Technology, ETH-Zentrum, Zurich
来源：
CATALYSIS LETTERS | 1994年 / 26卷 / 1-2期
关键词：
RESTRUCTURING (CORROSION) OF BIMETALLIC CATALYSTS; GERMANIUM PALLADIUM CATALYSTS; HYDROGENATION OF NITROBENZENE AND CROTONALDEHYDE; CATALYST POTENTIAL;
D O I：
10.1007/BF00824032
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：
An anomalous rate enhancement with increasing conversion has been observed during the liquid phase hydrogenation of nitrobenzene and crotonaldehyde over Ge/Pd/C catalysts at ambient temperature and atmospheric pressure. Inductive coupled plasma atomic emission spectroscopy and electrochemical measurement of the oxidation state of catalysts during reaction revealed that the bimetallic particles were partially oxidized by the reactants, which resulted in Ge-dissolution and increased exposure of Pd on the surface. It is proposed that the surface and bulk composition of Ge/Pd catalysts are a function of their oxidation state. This behaviour is due to the unusually high mobility of Ge in the Pd lattice and to the good solubility of GeO2 in polar solvents. The influence of hydrogen transport on the corrosion process and the stability of other X/Pd type bimetallic catalysts during liquid phase hydrogenation are also discussed.
引用
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页码：61 / 70
页数：10
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