Pt clusters in BaKL zeolite : characterization by transmission electron microscopy, hydrogen chemisorption, and X-ray absorption spectroscopy

M. Vaarkamp, J. Grondelle, van, J.T. Miller, D.J. Sajkowski, F.S. Modica, G.S. Lane, B.C. Gates, D.C. Koningsberger

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Abstract

Pt supported on BaKL zeolite was characterized by TEM, H chemisorption, and EXAFS spectroscopy. The results of all 3 techniques indicate the presence of highly dispersed Pt in the zeolite pores. There is no evidence of Pt outside the zeolite pores. The EXAFS data det. a Pt-Pt coordination no. of 3.7, suggesting that the av. Pt cluster in the zeolite consists of 5 or 6 atoms, consistent with the TEM and chemisorption data. The EXAFS data also provide evidence of the Pt zeolite interface, indicated by Pt-O contributions at 2.14 and 2.70 .ANG., and a Pt-Ba contribution at 3.8 .ANG.. The Pt/BaKL zeolite is one of the most highly dispersed supported Pt samples and one of the most structurally uniform supported metal catalysts.
Original languageEnglish
Pages (from-to)369-381
JournalCatalysis Letters
Volume6
Issue number3-6
DOIs
Publication statusPublished - 1990

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