Physicochemical and textural characterization of vanadium-magnesium mixed oxides

被引:21
作者
Balderas-Tapia, L
Wang, JA
Hernández-Pérez, I
Aguilar-Ríos, GG
Schacht, P
机构
[1] ESIQIE IPN, Dept Ingn Quim, Inst Politecn Nacl, Unidad PALM, Mexico City 07738, DF, Mexico
[2] Univ Autonoma Metropolitana Azcapotzalco, Area Quim Aplicada, Mexico City 02200, DF, Mexico
[3] Inst Mexicano Petr, Programa Ingn Mol Eje, Mexico City 07730, DF, Mexico
关键词
V-Mg-O catalysts; mesoporous materials; textural properties; Mg3V2O8;
D O I
10.1016/j.matlet.2004.05.036
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A series of vanadium-magnesium mixed oxides (V-Mg-O) with a mesoporous structure used for the propane oxidative dehydrogenation was synthesized by combining the impregnation and precipitation methods. Several techniques such as N-2 physisorption, X-ray diffraction (XRD), FTIR and temperature-programmed reduction (TPR) were applied to characterize the textural properties, phase composition and surface oxygen reduction features of the oxides. Textural properties of the calcined V-Mg-O oxides were found very sensitive to chemical composition: bimodal or multimodal pore size distributions was developed, which progressively varied with vanadium content. XRD analysis and infrared (IR) characterization confirm that the V-Mg-O oxides consist of a Mg3V2O8 Structure with VO4 tetrahedral units together with periclase phase. Magnesium incorporation with vanadium completely inhibits the formation Of V2O5 containing exposed V=O bonds. TPR results showed two peaks located between 500 and 750 degreesC, corresponding to the reduction of V5+ species in distorted VO4 units and to V5+ species belonging to bulk Mg orthovanadate, respectively. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:3034 / 3039
页数:6
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