Abstract
A series of silica-supported vanadia and molybdenum- and tungsten-promoted vanadia catalysts have been prepared and were characterized by means of low temperature oxygen chemisorption, 1H magic angle spinning nuclear magnetic resonance, X-ray diffraction, and electron spin resonance techniques. Reactivities of these catalysts for partial oxidation of methanol were also determined under atmospheric pressure in a flow microreactor. These results suggest the formation of the “patchy monolayer” phase of V oxide at lower loadings and on top of it bulk V 2O 5 at higher vanadium loadings. The presence of molybdenum increases the activity of the catalyst, whereas tungsten has the opposite effect. The improved activity of molybdena-vanadia catalyst was related to the better dispersion of the V oxide phase in the presence of Mo on silica surface.
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