Preparation of Organophilic Pd-Montmorillonite, An Efficient Catalyst in Alkyne Semihydrogenation

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Abstract

Palladium particles incorporated into organophilic montmorillonite (Pd-M) were prepared via a novel synthetic method, mediated by a cationic surfactant stabilizer. The materials were characterized by UV-Vis, ICP-AES, and TEM. Two representative samples (Pd-M1 and Pd-M2), with metal contents of 0.1% and 0.46%, respectively, were investigated in detail. TEM measurements indicated that the diameters of the Pd particles observed were in the range 1.5-6 nm. It is suggested that most of the Pd particles are situated on the external surface of the clay lamellae. Both Pd-M samples exhibited marked catalytic activities and stereoselectivities in the liquid-phase hydrogenation of 1-phenyl-1-butyne. For the production of the cis-alkene stereoisomer, Pd-M2 proved to be less active but more stereoselective than Pd-M1. The stereoselectivities obtained for Pd-M2 in n-hexane (86-88%) were nearly as high as those experienced for the Lindlar catalyst.

Original languageEnglish
Pages (from-to)146-152
Number of pages7
JournalJournal of Catalysis
Volume194
Issue number1
DOIs
Publication statusPublished - Aug 15 2000

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Keywords

  • 1-phenyl-1-butyne
  • Hydrogenation
  • Montmorillonite
  • Nanoparticles
  • Palladium
  • Stereoselectivity
  • Surfactant

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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