Valence of Highly Dispersed Cerium Oxide Species on Silica Quantitatively Estimated by Ce LIII-edge XANES

Hisao Yoshida; Leny Yuliati; Tomoyo Hamajima; Tadashi Hattori

doi:10.2320/matertrans.45.2062

Valence of Highly Dispersed Cerium Oxide Species on Silica Quantitatively Estimated by Ce L_III-edge XANES

Hisao Yoshida, Leny Yuliati, Tomoyo Hamajima, Tadashi Hattori

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Keywords: Cerium L_III-edge X-ray Absorption Near Edge Structure, silica-supported cerium oxide, valence, Ultraviolet absorption, highly dispersed cerium oxide species on silica

JOURNAL FREE ACCESS

2004 Volume 45 Issue 7 Pages 2062-2067

DOI https://doi.org/10.2320/matertrans.45.2062

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Abstract

A series of silica-supported cerium oxide samples having various cerium content were prepared by conventional impregnation method, followed by calcination in air. Ce L_III-edge XANES study revealed that highly dispersed cerium oxide species on silica surface were predominantly in trivalent oxidation state and cerium oxide nano-particles on silica contain mainly tetravalent cation like as CeO₂ bulk oxide. This elucidated that UV absorption band at 265 nm is assignable to Ce(III) species dispersed on silica.

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