丙烷氧化脱氢催化剂Ag-Mo-P-O中MoO3的作用

用XRD、H2-TPR、XPS、EPR、NH3-DRIFT、异丙醇分解反应和催化剂性能评价等方法比较研究了一系列Ag-Mo-P-O(AMP)催化剂的性质和催化性能.实验结果表明,AMP催化剂中MoO3和AgMoO2PO4两相之间产生由“一致性界面”引起的协同效应,两相相互作用的程度和接触程度影响该协同效应.该协同效应调变了催化剂中Mo5＋的浓度、催化剂的可还原性和酸性,从而影响了丙烷氧化脱氢制丙烯催化剂的性能.在AMP催化剂中存在适量的MoO3有助于获得较高的丙烯选择性和收率.

The Effect of MoO3 in Ag-Mo-P-O Catalysts on Oxidative Dehydrogenation of Propane

A series of AMP catalysts with different composition were prepared. These catalysts have been characterized by XRD, H2-TPR, XPS, EPR, NH3-DRIFT, decomposition of isopropanol reaction. The catalytic performance of oxidative dehydrogenation of propane on these catalysts was also examined. These results indicate that "coherent interface" exists between MoO3 and AgMoO2PO4 in AMP catalysts, leading to synergetic catalytic effect. The strength of synergetic effect is due to interaction and mutual covering of the two phases. The synergetic effect modified the concentration of Mo5 +, the reducibility and the acidity of AMP catalysts, leading to the influence on catalytic performance of oxidative dehydrogenation of propane to propene. The higher selectivity and yield of propene can be obtained on AMP catalysts with available quantity of MoO3.