丙烷在负载型V_2O_5/Zr_3(PO_4)_4催化剂上的氧化脱氢

Abstract

[中文摘要]制备了无定型的磷酸锆Ｚｒ３（ＰＯ４）４载体，采用浸渍法在载体上负载0.６％～６.０％的Ｖ２Ｏ５．所制备的催化剂在丙烷氧化脱氢反应中具有较好的催化性能，如３.０％Ｖ２Ｏ５／Ｚｒ３（ＰＯ４）４催化剂在丙烷转化率为１７.０％时，丙烯选择性可达５３.8％，丙烯收率达９.１％．考察了不同反应条件下催化剂的性能．ＸＲＤ、ＩＲ和Ｒａｍａｎ光谱表明，Ｖ２Ｏ５在Ｚｒ３（ＰＯ４）４载体上主要是以高度分散的钒氧物种存在；ＥＳＲ分析结果证明催化剂中存在Ｖ４＋物种，表明Ｖ５＋／Ｖ４＋参与了氧化还原反应．[英文摘要]0.6% ~ 6.0%V2O5 were supported on the amorphous Zr3(PO4)4 by a impregnation method. The supported catalysts were effective in the oxidative dehy drogenation of propane, e.g. on a 3.0%V2O5/Zr3(PO4)4 catalyst propene had selectivity of 53.8% at a propane conversion of 17.0% and the yield of propene w as 9.1%. XRD,IR and Raman results show ed that the vanadium oxide was distributed on the support in form of VOx species. ESR results indicated there are V4+ species in the catalysts, implying that the oxidation couple of V5+ /V4+ could be responsible for the redox react ion in propane oxidat ive dehydrogenation.