用原位共焦显微拉曼光谱技术考察了丙烷选择氧化反应中Ag-Mo-P-O催化剂的结构,讨论了催化剂动态结构的成因及其对催化剂性能的影响. 实验结果表明,在773 K和n(C3H8)∶n(O2)∶n(N2)=3∶1∶4的反应条件下,Ag-Mo-P-O催化剂中的Mo-O物种可转化为AgMoO2PO4中的Mo-O物种(多钼酸根),此时催化剂对丙烷选择氧化具有较高的催化活性. 催化剂中Mo-O物种的转化是由MoO3中Mo-O物种和AgMoO2PO4中Mo-O物种的结构特性决定的. AgMoO2PO4中的Mo-O物种具有较强的参与Mars van Krevelen氧化-还原循环的能力,可能是丙烷选择氧化反应的活性物种.
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