Co3V2O8催化剂的合成表征及其催化性能研究

Co₃V₂O₈催化剂的合成表征及其催化性能研究

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。

Abstract: 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 V⁴⁺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.