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
收藏
页码：61 / 70
页数：10
相关论文
共 23 条
  • [11] MALLAT T, 1993, STUD SURF SCI CATAL, V78, P377
  • [12] BULK ALLOY FORMATION DURING METAL-ION POISONING OF PALLADIUM
    MALLAT, T
    BODNAR, Z
    SZABO, S
    PETRO, J
    [J]. APPLIED CATALYSIS, 1991, 69 (01): : 85 - 95
  • [13] PARTICLE-SIZE DETERMINATION OF PLATINUM, PALLADIUM AND RHODIUM
    MALLAT, T
    PETRO, J
    [J]. REACTION KINETICS AND CATALYSIS LETTERS, 1979, 11 (04): : 307 - 311
  • [14] MARVELL EN, 1972, J ORG CHEM, V37, P2989, DOI 10.1021/jo00984a017
  • [15] MOLNAR A, 1988, HYDROGEN EFFECTS CAT, P513
  • [16] SELECTIVE OXIDATION OF METHYL ALPHA-D-GLUCOSIDE ON CARBON SUPPORTED PLATINUM .3. CATALYST DEACTIVATION
    SCHUURMAN, Y
    KUSTER, BFM
    VANDERWIELE, K
    MARIN, GB
    [J]. APPLIED CATALYSIS A-GENERAL, 1992, 89 (01) : 47 - 68
  • [17] SOKOLSKII DV, 1979, HYDROGENATION SOLUTI
  • [18] THE EXPERIMENTAL-EVIDENCE OF THE ROLE OF SURFACE RESTRUCTURING DURING CATALYTIC REACTIONS
    SOMORJAI, GA
    [J]. CATALYSIS LETTERS, 1992, 12 (1-3) : 17 - 34
  • [19] THE FLEXIBLE SURFACE - CORRELATION BETWEEN REACTIVITY AND RESTRUCTURING ABILITY
    SOMORJAI, GA
    [J]. LANGMUIR, 1991, 7 (12) : 3176 - 3182
  • [20] UNDERPOTENTIAL DEPOSITION OF METALS ON FOREIGN METAL SUBSTRATES
    SZABO, S
    [J]. INTERNATIONAL REVIEWS IN PHYSICAL CHEMISTRY, 1991, 10 (02) : 207 - 248
123