丙烷氧化脱氢催化剂V_2O_5/MPO_4(M=Al,Zr,Ca)的研究

Studies of the V\-2O\-5/MPO\-4(M=Al, Zr, Ca) Catalysts \=in Propane Oxidative Dehydrogenation

制备了３种磷酸盐（ＭＰＯ４，Ｍ＝Ａｌ，Ｚｒ，Ｃａ）载体，并在其上负载０．６％～６．０％的Ｖ２Ｏ５．活性评价结果表明，负载型Ｖ２Ｏ５／ＭＰＯ４催化剂在丙烷氧化脱氢反应中具有良好的催化性能．丙烯选择性按Ｖ２Ｏ５／Ｃａ３（ＰＯ４）２＞Ｖ２Ｏ５／Ｚｒ３（ＰＯ４）４＞Ｖ２Ｏ５／ＡｌＰＯ４顺序降低，这与载体的碱性强弱顺序变化一致．载体的性质和钒的负载量影响催化剂的氧化还原性能．ＥＳＲ结果表明，Ｖ４＋离子能可逆存在于催化剂中。

The supports of MPO\-4(M=Al, Zr, Ca) were prepared and 0.6%￣60%V\-2O\-5 was supported on them. The catalysts are effective in the oxidative dehydrogenation of propane. The selectivity of C\-3H\-6 over the catalysts decreases in the order of V\-2O\-5/Ca\-3(PO\-4)\-2>V\-2O\-5/Zr\-3(PO\-4)\-4>V\-2O\-5/AlPO\-4, which followed the same trend of the basicity of the supports. The properties of the supports and the amount of loading had an effect on the redox property and the catalytic behavior of the catalysts. The ESR results indicated that the redox couple of V\+\{5+\}/V\+\{4+\} responded to the activity of oxidative dehydrogenation for propane.\=