Pt L-3-edge XANES studies about the hydrogen adsorption on small Pt particles

Pt L-3-edge XANES spectra were measured on the inorganic oxide-supported Pt small particles with and without adsorbed hydrogen. A peak about 8 eV abov e the edge appeared in the difference spectra between the Pt samples with a nd without hydrogen adsorption. The peak position in difference spectra was invariant with the particle sizes, the amount of adsorbed hydrogen and coa dsorbates, and kind of supports. The peak intensity was only proportional t o the amount of adsorbed hydrogen. Multiple scattering calculation could re produce the peak induced by the hydrogen adsorption and showed the peak ene rgy was independent of the number and the adsorption site of hydrogen on Pt surface. The Pt L-3-edge XANES will be a good tool for the quantitative an alysis of the adsorbed hydrogen on small metal Pt particles.