钼基催化剂氧化还原性质对丙烷选择氧化制丙烯醛反应的影响  

Effect of Redox Properties on Selective Oxidation of Propane to Acrolein over Molybdate-Based Catalyst

作　　者：张昕[1] 伊晓东[2] 毕盈[2] 翁维正[2] 万惠霖[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,福建厦门361005

出　　处：《催化学报》2002年第3期281-284,共4页

基　　金：国家重点基础研究规划项目 (G19990 2 2 40 8)

摘　　要：制备了Ag0 3 MoP0 6Ox 和Ce0 1Ag0 3 MoP0 6Oy 催化剂 ,并用XRD ,TPR ,LRS ,XPS和EPR对催化剂进行了表征 ,考察了催化剂的氧化还原性质及其对丙烷选择氧化制丙烯醛反应的催化性能 .结果表明 ,由于Ce和Mo发生相互作用 ,调变了催化剂的可还原性和配位不饱和Mo的量 ,使Ce0 1Ag0 3 MoP0 6Oy 催化剂对反应中间产物丙烯和正丙醇转化为丙烯醛具有较高的能力 。The Ag-0.3 Mo0.6Ox and Ce0.1Ag0.3MoP0.6Oy catalysts were prepared and characterized by XRD, TPR, LRS, XPS and EPR techniques. And the catalytic performance of the catalysts for selective oxidation of propane to acrolein was studied. The results showed that the higher propane conversion with higher selectivity for acrolein was obtained on Ce0.1Ag0.3MoP0.6Oy catalyst, In addition, the possible intermediates, propene and propanol, were favorable for the transformation to acrolein on Ce0.1Ag0.3MoP0.6Oy catalyst. After Ce was doped in Ag0.3MoP0.6Ox, the CeO2 and Ce2MoO6 could be measured. The addition of Ce to Ag0.3MoP0.6Ox improved the reducibility and the concentration of Mo5+ owing to the formation of redox couple Mo6+ + Ce3+ === Mo5+ + Ce4+, leading to the higher propane conversion and the higher selectivity for acrolein.

关 键 词：钼基催化剂 氧化还原性质 选择氧化 铈 银 钼 磷 复合氧化物 丙烷 丙烯醛 催化活性 

分 类 号：O643.3[理学—物理化学]