Influence of phosphorus concentration on the state of the surface layer of Pd–P hydrogenation catalysts

Phase composition and surface layer state of the Pd–P hydrogenation catalyst formed at various P/Pd ratios from Pd(acac) 2 and white phosphorus in a hydrogen atmosphere were determined. Palladium on the catalyst surface is mainly in two chemical states: as Pd(0) clusters and as palladium phosphides....

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Bibliographic Details
Published in:Russian journal of general chemistry 2016-09, Vol.86 (9), p.2022-2032
Main Authors: Belykh, L. B., Skripov, N. I., Sterenchuk, T. P., Akimov, V. V., Tauson, V. L., Schmidt, F. K.
Format: Article
Language:English
Subjects:
Catalysts
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Clusters
Hydrogenation
Palladium
Phase composition
Phosphides
Phosphorus
Surface layers
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Summary:Phase composition and surface layer state of the Pd–P hydrogenation catalyst formed at various P/Pd ratios from Pd(acac) 2 and white phosphorus in a hydrogen atmosphere were determined. Palladium on the catalyst surface is mainly in two chemical states: as Pd(0) clusters and as palladium phosphides. As the P/Pd ratio increases, the fraction and size of palladium clusters decrease, and also the phase composition of formed palladium phosphides changes: Pd 3 P 0.8 → Pd 5 P 2 → PdP 2 . The causes of the modifying action of phosphorus on the properties of palladium catalysts for hydrogenation of unsaturated compounds were considered.
ISSN:1070-3632
1608-3350
DOI:10.1134/S1070363216090073