On the nature of highly dispersed vanadium oxide catalysts:: effect of the support on the structure of VOx species

被引：39

作者：

Ferreira, ML ^{[1
]}

Volpe, M ^{[1
]}

机构：

[1] Consejo Nacl Invest Cient & Tecn, PLAPIQUI, UNS, RA-8000 Bahia Blanca, Argentina

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2000年 / 164卷 / 1-2期

关键词：

VOx catalysts; catalysts characterization; supported vanadia; extended Huckel; partial oxidation catalysts;

D O I：

10.1016/S1381-1169(00)00360-5

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 nature of VOx specie supported on TiO2, gamma -Al2O3 and SiO2 is analyzed. The plausibility of different VOx specie (mono, di, pyrovanadates) is evaluated by means of a theoretical study of the extended Huckel (EH) type. Theoretical results are compared with published characterization data and discussion is performed taking account both results. The interaction of VOx with the support and the structure of supported surface vanadia are influenced by the composition of the oxide carrier. On SiO2, only the monovanadate species are formed. On gamma -Al2O3, dimers seem to be the more plausible supported form of VOx. On TiO2, monomers and dimers are present; however, the latter species being the most abundant. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：281 / 290

页数：10

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