Influence of the dispersion of metallic particles on the reaction of triphenylarsine with alumina-supported nickel

V. Maurice, Y. A. Ryndin, J. P. Candy, Jean-Marie Maurice Basset, G. Bergeret, L. Savary

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The hydrogenolysis of triphenylarsine with alumina-supported nickel catalysts with various particle sizes was studied at temperatures ranging from 303 to 443 K under 12 bar of hydrogen. The reaction initially takes place selectively on the surface of the nickel particles and leads to the successive hydrogenolysis of -As-Ph bonds with benzene and cyclohexane formation. At 303 K, the reaction stops when the Ni particles are completely covered with grafted-As-Ph fragments. The quantity of fixed arsenic increases with the dispersion of the metal particles. It is proposed that more As-Ph fragments (per metallic atom) are grafted onto edge atoms than onto face atoms of the Ni particles. When the reaction is performed at higher temperature, the As atoms migrate inside the nickel particles easily and form an intermetallic compound. At 373 K, the Ni5As2 phase, very poorly crystallized, is obtained. At 443 K, the reaction leads to a well-crystallized phase NiAs. The dispersion of the catalyst has no influence on the nature of the formed intermetallic species. However, the formation rate of these species increases with the dispersion of the catalysts.

Original languageEnglish (US)
Pages (from-to)192-199
Number of pages8
JournalJournal of Catalysis
Volume204
Issue number1
DOIs
StatePublished - Jan 1 2001

Keywords

  • Catalyst poisoning (arsenic)
  • Nickel catalyst
  • Particle size effect

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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