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Quantitative analysis of hydrogen adsorbed on Pt particles on SiO2 in the presence of coadsorbed CO by means of L3-edge X-ray absorption near-edge structure spectroscopy

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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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Authors
  1. T. Kubota
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  2. K. Asakura
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  3. Y. Iwasawa
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Kubota, T., Asakura, K. & Iwasawa, Y. Quantitative analysis of hydrogen adsorbed on Pt particles on SiO2 in the presence of coadsorbed CO by means of L3-edge X-ray absorption near-edge structure spectroscopy. Catalysis Letters 46, 141–144 (1997). https://doi.org/10.1023/A:1019087006275

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