Ni-V-O催化剂的合成、表征及其催化性能

制备了Ni3V2O8, Ni2V2O7, NiV2O6催化剂, 进行了XRD, BET, H2-TPR, XPS和电导等表征, 并测试了这三种结构催化剂对丙烷氧化脱氢制丙烯反应的催化性能, 分析了影响催化性能的因素. 实验结果表明, 当丙烷的转化率为10%时, 在p-型半导体Ni3V2O8和Ni2V2O7催化剂上丙烯的选择性为69.13%和70.21%, 而在n-型半导体NiV2O6上, 丙烯的选择性为64.41%, 表明p-型半导体Ni3V2O8和Ni2V2O7的催化性能优于n-型半导体NiV2O6的催化性能. XPS实验结果表明, 这可能与p-型半导体正钒酸镍(Ni3V2O8)和焦钒酸镍(Ni2V2O7)催化剂表面含较多O-氧物种和V4+有关.

Synthesis,Characterization and Catalytic Performance of Ni-V-O Catalysts

Catalysts Ni3V2O8,Ni2V2O7,NiV2O6 were prepared and characterized by X-ray diffraction(XRD),BET,H2-TPR,XPS and conductivity measurement.Their catalytic performance for the oxidative dehydrogenation of propane to propene was investigated.The results show that the selectivities to propene were 69.13,70.21 and 64.41 over p-type semiconductor Ni3V2O8,Ni2V2O7 and n-type NiV2O6 catalysts with 10 propane conversion,respectively.These results suggest that p-type semiconductor catalysts have a better catalytic performance than n-type ones,that C3H6 selectivity has a good correlation with the electrical conductivity and that selectivity depends on the existence of Ni3V2O8 or Ni2V2O7 phase.XPS results illustrate that high catalytic performance on p-type semiconductor Ni3V2O8 and Ni2V2O7 was related to the abundant {oxygen} species O-and V4 existing over these catalysts.