Characterization of Pt particle interaction with L-zeolite by X-ray absorption spectroscopy: Binding energy shifts, X-ray absorption near-edge structure, and extended X-ray absorption fine structure

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).