EFFECT OF Ni/Mo RATIO ON STRUCTURE OF Ni-Mo NITRIDE AND PROPANE AMMOXIDATION REACTION

Abstract

Abstract: Ni-Mo oxide was prepared by co-precipitation of nickel nitrate and ammonium heptamolybdate. Ni-Mo nitride catalysts were synthesized by temperature-programmed nitridation reaction of Ni-Mo oxide in a mixture of H2/N2. The structure and redox properties of the Ni-Mo oxide and corresponding nitride catalysts were characterized by XRD, visible-Raman, FT-IR, and H2-TPR. The catalytic performance for propane ammoxidation was tested. The experimental results showed that Ni2Mo3N or the mixture of g-Mo2N and Ni2Mo3N can be synthesized by controlling Ni/Mo atomic ratio. These results suggested that the synergetic effect between g-Mo2N and Ni2Mo3N in the mixed Ni-Mo nitrides plays an important role in the process of propane ammoxidation. The mixed Ni-Mo nitride catalyst shows much higher catalytic activity and selectivity for ACN than g-Mo2N or Ni2Mo3N alone. The mixed NiMo nitride catalyst with 3/2 of Ni/Mo atomic ratio showed the best catalytic performance for propane ammoxidation. At 773 K, the conversion of propane is 75.0%, the selectivity and the yield of ACN are 38.6% and 28.95%, respectively.

Key words: Ni/Mo ratio, Ni-Mo nitride, catalyst, alkane, ammoxidation

CLC Number:

References

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