丙烷氧化脱氢催化剂Ag-Mo-P-O中MoO_3的作用  

The Effect of MoO_3 in Ag-Mo-P-O Catalysts on Oxidative Dehydrogenation of Propane

作　　者：张昕[1] 万惠霖[2] 翁维正[2] 伊晓东[2] 

机构地区：[1]清华大学化学系一碳化学与化工国家重点实验室,北京100084 [2]厦门大学化学系固体表面物理化学国家重点实验室,厦门361005

出　　处：《物理化学学报》2002年第10期878-883,共6页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划(G1999022408)资助项目

摘　　要：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,AA4P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.该协同效应凋变了催化剂中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.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.

关 键 词：丙烷 氧化脱氢 丙烯 Mo基催化剂 MOO3 协同效应 银 三氧化钼 催化性能 

分 类 号：O643.3[理学—物理化学]