摘要
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.
Catalysts Ni3V2O8, Ni2V2O7, NiV2O6 were prepared and characterized by X-ray diffraction （XRD） , BET, n2-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 V^4＋ existing over these catalysts.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第2期341-345,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20663004)资助
