Pt clusters in BaKL zeolite: Characterization by transmission electron microscopy, hydrogen chemisorption, and X-ray absorption spectroscopy
作者： M. Vaarkamp , J. V. Grondelle , J. T. Miller , D. J. Sajkowski , F. S. Modica
DOI: 10.1007/BF00764004
关键词:
摘要: Platinum supported on BaKL zeolite was characterized by Transmission Electron Microscopy (TEM), hydrogen chemisorption, and Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy. The results of all three techniques indicate the presence highly dispersed platinum in pores. There is no evidence outside EXAFS data determine a Pt-Pt coordination number 3.7, suggesting that average cluster consists 5 or 6 atoms, consistent with TEM chemisorption data. also provide platinum-zeolite interface, indicated Pt-O contributions at 2.14 2.70 A, Pt-Ba contribution 3.8 A. Pt/BaKL one most samples structurally uniform metal catalysts.
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