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- W2022737078 abstract "The influence of sodium and phosphorus on the oxidation state of vanadium and molybdenum species and on the redox process of a V-Mo-O catalyst was studied by X-ray photoelectron spectroscopy and thermal gravimetric analysis. Why the sodium doping increased activity and the phosphorus doping improved selectivity in the V-Mo-O catalyst is explained. The sodium ions in the V-Mo-O catalyst seem to decrease the dissociation energy of adsorbed oxygen molecules and therefore make it favorable to the reoxidation of reduced molybdenum and vanadium species; the sodium ions in the V-Mo-O catalyst also weaken the MO bonds, and therefore promote the vanadium species to be reduced. In other words, the sodium doping promotes the redox process of the V-Mo-O catalyst. The phosphorus ions in the V-Mo-O catalyst tend to keep the reduced vanadium species in a V4+ state and prevent the vanadium species from being significantly reduced, which may be an important reason for improving the selectivity of the V-Mo-O catalyst. In addition, both the sodium and the phosphorus doping in the V-Mo-O catalyst seem to be also helpful in diffusing lattice oxygen." @default.
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- W2022737078 date "1993-04-01" @default.
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- W2022737078 title "Promotional effect of sodium and phosphorus on a V-Mo-O catalyst" @default.
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- W2022737078 doi "https://doi.org/10.1016/0926-860x(93)80077-4" @default.
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