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Structural analysis of tungsten–zirconium oxide catalyst by W K‐edge and L 1 ‐edge XAFS
Author(s) -
Yamamoto Takashi,
Orita Akihiro,
Tanaka Tsunehiro
Publication year - 2008
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1044
Subject(s) - tungsten , x ray absorption fine structure , xanes , catalysis , zirconium , butane , tungsten oxide , oxide , materials science , scheelite , inorganic chemistry , absorption (acoustics) , tungsten compounds , chemistry , crystallography , analytical chemistry (journal) , metallurgy , spectroscopy , organic chemistry , composite material , physics , quantum mechanics
The local structure of tungsten species in tungsten–zirconium–oxide catalysts (WO x ZrO 2 ) was first investigated by W K‐edge x‐ray absorption spectroscopic techniques. A proportion of WO 4 to the total WO x species was quantitatively analyzed with W L 1 ‐edge x‐ray absorption near edge structure (XANES). Tungsten species in 15 wt% WO x ZrO 2 , which is the most active for n ‐butane skeletal isomerization, consists of a mixture of WO 3 ZrO 2 solid solution, WO 6 aggregate and WO 4 species on the catalyst surface. The tungsten species does not possess long‐range ordering. Copyright © 2008 John Wiley & Sons, Ltd.