EFFECT OF ORGANIC SPECIES ON THE CHARACTERISTICS OF MOLYBDENUM-VANADIUM OXIDE

Abstract

In this study, molybdenum-vanadium oxide samples were prepared via reflux method. Urea and hexane were applied in the mixture in order to improve the physicochemical properties of the mixed oxide. A control sample without the presence of organic species was also prepared. X-ray diffraction analysis showed that the precursors were in a complex mixed phase. All of the precursors were calcined in N₂ flow at 573, 623, 673, 723 and 773 K for 2 hours. Calcined samples were denoted as Cont_calc, Ur_calc and Hex_calc. Samples calcined at 573 K were still in a complex mixed phases. When calcined at 623 K, Cont_calc and Hex_calc showed a hexagonal MoVOx phase while Ur_calc was in a monoclinic MoOx phase. However, calcination at 773 K has managed to transform all samples into the monoclinic MoOx phase. On specific surface area analysis, Ur_calc gave the highest value, which was 10.8 m²g^-1.