An XRD and ESR study of V2O5/ZrO2 catalysts:: influence of the phase transitions of ZrO2 on the migration of V4+ ions into zirconia

被引：45
|
作者：
Adamski, A
Sojka, Z
Dyrek, K
Che, M
机构：
[1] Jagiellonian Univ, Fac Chem, PL-30060 Krakow, Poland
[2] Univ Paris 06, URA 1106 CNRS, Lab React Surface, F-75252 Paris 05, France
来源：
SOLID STATE IONICS | 1999年 / 117卷 / 1-2期
关键词：
V2O5/ZrO2; catalysts; potassium; ZrO2 phase transitions; V4+-ion migration; ESR; XRD; Rietveld analysis;
D O I：
10.1016/S0167-2738(98)00254-9
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A series of undoped and potassium-doped catalysts for the oxidative dehydrogenation of propane, based on zirconia-supported V2O5 was investigated by XRD and ESR techniques. The chemical state of the surface and bulk vanadium species and of the ZrO2 matrix was investigated as a function of the calcination temperature and the presence of dopants. It was found that potassium improves the dispersion of surface vanadium species and affects the temperature of the phase transitions of zirconia. These two effects facilitate the incorporation of vanadium (IV) into the ZrO2 matrix. The formation of substitutional solid solution was revealed by Rietveld analysis. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：113 / 122
页数：10
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