Preparation of monodispersed Pt nanoparticles in MCM-41, catalytic applications

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21 Citations (Scopus)

Abstract

Pt nanoparticles were synthesized in MCM-41 by applying a cationic surfactant, which acts as both a structure directing agent and a stabilizer. The structural characterization of Pt-MCM-41 was performed by ICP-AES, N2 sorption, X-ray diffraction and transmission electron microscopy. It was established that a significant proportion of the monodispersed Pt particles formed upon reduction was incorporated into the pore channels of a regular MCM-41 framework. The Pt-MCM-41 sample was tested as a catalyst in the liquid-phase hydrogenations of 1-hexene, cyclohexene, styrene, 1-pentyne and 1-hexyne under mild conditions. The hydrogenation rates were affected by diffusion limitations, which was attributed to the predominance of Pt particles encapsulated inside the mesopores. The highest catalytic activity was observed for the reactant of the smallest size, 1-pentyne. The catalytic activity was found to diminish as the molecular dimensions of the reactants increased, which indicated that Pt-MCM-41 was a shape selective catalyst.

Original languageEnglish
Pages (from-to)762-768
Number of pages7
JournalCatalysis Communications
Volume9
Issue number5
DOIs
Publication statusPublished - Mar 20 2008

Keywords

  • 1-Hexene
  • 1-Hexyne
  • 1-Pentyne
  • Catalytic activity
  • Cationic surfactant
  • Cyclohexene
  • Hydrogenation
  • MCM-41
  • Molecular dimension
  • N sorption
  • Nanoparticle
  • Platinum
  • Shape selectivity
  • Styrene
  • Transmission electron microscopy
  • Turnover frequency
  • X-ray diffraction

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Process Chemistry and Technology

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