We have used X-ray absorption to measure the binding energy, X-ray absorption near-edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) of Pt particles in L-zeolite saturated with H2 at room temperature and after desorption of H2 in He. The desorption of H2 causes the particles to disorder or perhaps breakup such that the coherence required for EXAFS is lost. The shift (with respect to bulk metal) of the binding energy of the Pt in the zeolite, not stabilized by chemisorbed H2, suggests an interaction with the zeolite support (and may reflect electronic charge transfer to the Pt).
ASJC Scopus subject areas
- Physical and Theoretical Chemistry