Influence of reducibility of vanadium-magnesium mixed oxides on the oxidative dehydrogenation of propane

被引:35
作者
Balderas-Tapia, L
Hernández-Pérez, I
Schacht, P
Córdova, IR
Aguilar-Ríos, GG
机构
[1] UPALM, IPN, ESIQIE, Dept Ingn Quim Ind, Mexico City 07738, DF, Mexico
[2] Univ Autonoma Metropolitana Azcapotzalco, Area Quim Aplicada, Mexico City 02200, DF, Mexico
[3] Inst Mexicano Petr, Mexico City 07730, DF, Mexico
关键词
propane; propene; oxidative dehydrogenation; V-Mg-O catalysts; Mg3V2O8; reducibility;
D O I
10.1016/j.cattod.2005.07.025
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A series of vanadium-magnesium mixed oxides used for the propane oxidative dehydrogenation were synthesized by combining the impregnation and precipitation methods. Several techniques such as, FTIR, XRD and TPR-H-2 were applied to characterize physicochemical properties. XRD analysis confirms that the V-Mg-O oxides consist of Mg3V2O8 structure with VO4 tetrahedral units together with periclase phase. Magnesium incorporation with vanadium inhibits the formation of V2O5 containing exposed V=O bonds. TPR-H-2 results show two peaks located between 500 and 750 degrees C, which, respectively, correspond to reduction of V5+ species in distorted VO4 units and V5+ species belonging to bulk Mg orthovanadate. The highest activity and selectivity were obtained on catalysts in which isolated VO4 tetrahedral are present. A relationship between reducibility degree of V5+ distorted species (into unities VO4), and catalytic activity was observed. In order to get a higher activity a maximum content of 45% as vanadium oxide. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:371 / 376
页数:6
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