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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.45  No.7 (2004)  >  pp.2062-2067

MATERIALS TRANSACTIONS
<<Previous article Vol.45  No.7 (2004)   pp.2062 - 2067 Next article>>

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

Hisao Yoshida1), Leny Yuliati2), Tomoyo Hamajima2) and Tadashi Hattori2)
1) Research Center for Advanced Waste and Emission Management (ResCWE), Nagoya University
2) Department of Applied Chemistry, Graduate School of Engineering, Nagoya University


A series of silica-supported cerium oxide samples having various cerium content were prepared by conventional impregnation method, followed by calcination in air. Ce LIII-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.


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

Received: February 03, 2004
Accepted: March 15, 2004 , Published online: June 24, 2005
Copyright (c) 2005 The Japan Institute of Metals

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