摘要
采用共沉淀法制备了Co3V2O8催化剂,并对催化剂进行了BET、XRD、H2-TPR、XPS、和TEM等技术表征,研究了其丙烷氧化脱氢(ODH)制丙烯反应的催化性能。H2-TPR和XPS实验结果表明,Co3V2O8催化剂中晶格氧可以较容易转换成可动氧物种(即未完全还原氧物种),使催化剂内各种价态的钒之间易于进行氧化还原反应并形成氧缺位,催化剂的表面含有较多未充分还原氧物种O-和V4+物种。催化活性结果显示,在425℃和475℃,丙烯选择性分别为49.45%和33.74%,表现了较好的催化性能。
Co3V2O8 catalyst was prepared by co-precipitation method and was characterized by XRD, BET, H2- TPR, XPS and TEM in this paper. The catalytic performance for the oxidative dehydrogenation of propane to propylene has also been investigated. The results of H2-TPR and XPS illustrated that the transformation of lattice oxygen to mobile oxygen species （non-complete reduction oxygen） might promote the oxidation-reduction reaction between different valence vanadium, which led to abundant non-complete reduction oxygen O- and V^4＋ species formation over the Co3V2O8 catalyst surface. The active results showed that 49.45% and 33.74% propylene selectivity could be obtained at the reaction temperature of 425 ℃ and 475 ℃ respectively.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2009年第2期252-256,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(20663004)
关键词
Co3V2O8
氧化脱氢
氧物种
Co3V2O8
oxidative dehydrogenation （ODH）
oxygen species
