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Catalysis Letters

, Volume 37, Issue 1–2, pp 29–33 | Cite as

Preparation of nanosize Pt clusters using ion exchange of Pt(NH3) 4 2+ inside mesoporous channel of MCM-41

  • Ryong Ryoo
  • Chang Hyun Ko
  • Ji Man Kim
  • Russell Howe
Article

Abstract

Mesoporous molecular sieve MCM-41 with a Si/Al ratio of 35 was obtained by hydrothermal synthesis using a gel mixture with a molar composition of 6 SiO2∶0.1 Al2O3∶1 hexadecyltrimethylammonium chloride∶ 0.25 dodecyltrimethylammonium bromide∶ 0.25 tetrapropylammonium bromide∶0.15 (NH4)2O∶1.5 Na2O∶300 H2O. The MCM-41 sample was calcined in O2 flow at 813 K and subsequently ion exchanged with Ca2+. A small Pt cluster has been supported on the MCM-41 sample following a procedure using ion exchange of Pt(NH3) 4 2+ . The Pt(NH3) 4 2+ ion supported on MCM-41 has been activated in O2 flow at 593 K and subsequently reduced with Fh flow at 573 K, in the same way used for the preparation of a Pt cluster entrapped inside the supercage of zeolite NaY. The resulting Pt cluster supported on the MCM-41 shows hydrogen chemisorption oftotal two H atoms per Pt at 296 K (based on the total amount of Pt) and high catalytic activity for hydrogenolysis of ethane. The chemical shift in129Xe NMR spectroscopy of adsorbed xenon indicates that the Pt cluster is located inside the mesoporous molecular sieve.

Keywords

MCM-41 zeolite ion exchange Pt cluster 129Xe NMR 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1996

Authors and Affiliations

  • Ryong Ryoo
    • 1
    • 2
  • Chang Hyun Ko
    • 1
  • Ji Man Kim
    • 1
  • Russell Howe
    • 2
  1. 1.Department of Chemistry and Center for Molecular ScienceKorea Advanced Institute of Science and TechnologyTaejonKorea
  2. 2.Department of Physical ChemistryUniversity of New South WalesAustralia

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