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Titolo:
REACTANT INDUCED RESTRUCTURING AND CORROSION OF GERMANIUM PALLADIUM CATALYSTS DURING HYDROGENATION REACTIONS
Autore:
BODNAR Z; MALLAT T; BAIKER A;
Indirizzi:
SWISS FED INST TECHNOL,DEPT CHEM ENGN & IND CHEM CH-8092 ZURICH SWITZERLAND
Titolo Testata:
Catalysis letters
fascicolo: 1-2, volume: 26, anno: 1994,
pagine: 61 - 70
SICI:
1011-372X(1994)26:1-2<61:RIRACO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
BULK ALLOY FORMATION; UNDERPOTENTIAL DEPOSITION; OXIDATION-STATE; CARBON CATALYST; PLATINUM; SURFACE;
Keywords:
RESTRUCTURING (CORROSION) OF BIMETALLIC CATALYSTS; GERMANIUM PALLADIUM CATALYSTS; HYDROGENATION OF NITROBENZENE AND CROTONALDEHYDE; CATALYST POTENTIAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
Z. Bodnar et al., "REACTANT INDUCED RESTRUCTURING AND CORROSION OF GERMANIUM PALLADIUM CATALYSTS DURING HYDROGENATION REACTIONS", Catalysis letters, 26(1-2), 1994, pp. 61-70

Abstract

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 atmosphericpressure. 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 stabilityof other X/Pd type bimetallic catalysts during liquid phase hydrogenation are also discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/07/20 alle ore 22:35:58