Author： Kubota T. Asakura K. Iwasawa Y.
Publisher： Springer Publishing Company
ISSN： 1011-372X
Source： Catalysis Letters, Vol.46, Iss.3-4, 1997-07, pp. : 141-144
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Abstract
X-ray absorption near-edge structure (XANES) spectra at the Pt L3-edge for Pt particles supported on SiO2 under CO adsorption and CO+H2 coadsorption were recorded to analyze the amount of adsorbed hydrogen in the coadsorbed state on the Pt particles. Adsorbed CO on the Pt particles revealed a new peak at 6 eV above the Pt L3-edge in the difference spectra before and after CO adsorption in the coverage range 0.10-0.51. Subsequent adsorption of hydrogen at various coverages on the CO-preadsorbed Pt particles broadened and shifted the peak to the higher energy side. The peak was deconvoluted to two components due to adsorbed hydrogen and CO by a linear least-squares fitting technique. It was found that the fitting coefficient with respect to adsorbed hydrogen was proportional to the amount of adsorbed hydrogen. The XANES difference spectra provide a quantitative analysis method for adsorbed hydrogen on supported Pt particles in the presence of coadsorbates like CO.
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