Abstract
Vanadium phosphorus oxide (VPO) catalyst precursors were prepared in organic phase by using isobutanol as the reducing agent. They were doped by combined components—Zn+Zr+Mo, Zr+Zn and Zr+Mo—through impregnation. In order to increase the catalyst surface areas, the catalyst precursors were ball milled in different solvents for a certain period of time. X-ray diffraction (XRD), X-ray fluorescence spectrometer (XFS), DTA/TGA, X-ray photoelectron spectrometer (XPS) and BET were used to examine the bulk and surface properties of the final catalysts and their precursors. Catalytic performances were measured in the selective oxidation of n-butane into maleic anhydride (MA). The results revealed that ball milling could improve the performances of these VPO catalysts, without destroying the active physico-chemical structure and without exerting great influence on the surface characteristics of the catalysts. Interaction between the combined moderators was also preliminarily discussed. The Mo component was found to have some kind of stabilizing effect on the catalyst surface of this system.
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