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Applied Magnetic Resonance

, Volume 8, Issue 3–4, pp 475–488 | Cite as

Application of129Xe NMR spectroscopy and EXAFS to probe the formation of a bimetallic cluster in zeolite Y

  • C. Pak
  • R. Ryoo
Article

Abstract

Palladium was supported on CaY zeolite by ion exchange of Pd(NH3) 4 2+ into CaY zeolite, calcination in O2 and subsequent reduction with H2. Platinum and silver were added to this Pd/CaY zeolite by ion exchange of Pt(NH3) 4 2+ and Ag+, respectively, and subsequent reduction with Hg. Extended X-ray absorption fine structure of these metals indicates that the successive metal-loading treatments lead first to the formation of a 1-nm Pd cluster inside the supercage of CaY zeolite and to the subsequent formation of bimetallic clusters through incorporation of Pt and Ag atoms into the small Pd cluster. The line width and chemical shift of129Xe NMR spectrum of xenon gas adsorbed on the zeolite show dramatic changes during the metal clustering procedure, which indicates that129Xe NMR spectroscopy can be used to probe the formation of bimetallic clusters.

Keywords

Zeolite Zeolite Crystal Bimetallic Cluster Strong Adsorption Site Weak Adsorption Site 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1995

Authors and Affiliations

  • C. Pak
    • 1
  • R. Ryoo
    • 1
  1. 1.Department of Chemistry and Center for Molecular ScienceKorea Advanced Institute of Science and TechnologyTaejonKorea

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