Pd nanoparticles in hydrotalcite: Mild and highly selective catalysts for alkyne semihydrogenation

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Abstract

Pd nanoparticles incorporated in a hydrotalcite (HT) host were prepared via anion exchange between a dilute suspension of HT-nitrate and a Pd hydrosol stabilized by the anionic surfactant sodium dodecyl sulfate. Samples of two of the resulting Pd organoclays, Pd-HT1 and Pd-HT2, with metal contents of 0.1 and 0.42%, respectively, were subjected to further investigations. Characterization via ICP-AES, XRD, and TEM measurements indicated the deposition of fairly monodispersed Pd particles, predominantly on the external surface of the HT layers. The Pd-HT samples proved to be efficient catalysts for the liquid-phase semihydrogenations of both terminal and internal alkynes under mild conditions. For the transformation of phenylacetylene to styrene, a bond selectivity of 100% was obtained, and the cis stereoselectivities for the hydrogenations of the internal alkynes 4-octyne and 1-phenyl-1-pentyne reasonably approached 100%. The catalytic activity of Pd-HT increased with the Pd dispersion, whereas the alkene selectivity remained essentially unaffected.

Original languageEnglish
Pages (from-to)372-381
Number of pages10
JournalJournal of Catalysis
Volume220
Issue number2
DOIs
Publication statusPublished - Dec 10 2003

Keywords

  • 1-Phenyl-1-butyne
  • 4-Octyne
  • Anionic surfactant
  • Hydrogenation
  • Hydrotalcite
  • Palladium
  • Phenylacetylene
  • Selectivity

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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