In situ FTIR and Raman study on the distribution and reactivity of surface vanadia species in V2O5/CeO2 catalysts

被引：32
作者：
Bosco, Marta V. [1 ]
Banares, Miguel A. [2 ]
Martinez-Huerta, Maria V. [2 ]
Bonivardi, Adrian L. [1 ]
Collins, Sebastian E. [1 ]
机构：
[1] UNL, CONICET, Inst Desarrollo Tecnol Ind Quim INTEC, RA-3000 Santa Fe, Argentina
[2] CSIC, Inst Catalisis & Petroleoquim, E-28049 Madrid, Spain
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2015年 / 408卷
关键词：
Vanadia; Ceria; Methanol oxidation; Raman; Infrared spectroscopy; METAL-OXIDE CATALYSTS; METHANOL OXIDATION; INFRARED-SPECTROSCOPY; VIBRATIONAL-SPECTRA; ACTIVE-SITES; CEO2; NANOCRYSTALS; CARBON-DIOXIDE; FORMIC-ACID; ADSORPTION; CERIA;
D O I：
10.1016/j.molcata.2015.07.012
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：
The surface structure and reactivity of vanadia supported on ceria catalysts were studied by Raman spectroscopy and methanol adsorption and temperature-programmed surface reaction (TPRS) of the adsorbed species monitored in situ by infrared spectroscopy. Monomeric and polymeric vanadia surface species and CeVO4 were identified on the catalysts. Methanol adsorption reveled that mostly reduced Ce3+ sites are present in the surface of the catalysts, produced as a result of the reductive solid reaction of VOx species with the ceria surface. Adsorbed methanol/methoxy decomposed stepwise to formate and, finally, carbonate/carbon dioxide. The reactivity is linked to interphase sites, Ce-O-V, which could favor the abstraction of hydrogen during the methoxy transformation to formates. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：75 / 84
页数：10
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