过渡金属离子对HPAsMoVO杂多酸的氧化性能的影响  

Study on the Effects of Transition Metal Cations on the Oxidation Ability of the HPAsMoVO Heteropoly Acid

作　　者：蔡铁军[1] 余长林[1] 彭振山[1] 邓彤彤[1] 邓谦[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《分子催化》2006年第4期326-329,共4页Journal of Molecular Catalysis(China)

基　　金：湖南省自然科学基金项目(04JJ6003);(05JJ30143)

摘　　要：用H2-TPR方法研究了过渡金属离子及其含量对杂多酸-HxPAs0.2Mo10VOy的氧化性能的影响,并在固定床反应器上考察了M0.2HxPAs0.2Mo10VOy(M=Fe3+、Co2+、N i2+和Cu2+)催化剂对异丁烷选择性氧化的催化性能.研究结果表明用过渡金属离子取代杂多酸中的质子,可以在较大程度上增强杂多酸的低温氧化能力,其中Fe3+对增强杂多酸的催化活性最为明显,而Cu2+却有利于提高目的产物甲基丙烯酸的选择性.The effects of transition metal cations（ M=Fe^3＋、Co^2＋、Ni^2 and Cu^2＋ ）on the ability of catclytic oxidation of the H, PAs0.2 Mo10 VOy heteropoly acid were studied by H2-TPR method. The catalytic performance of the Mo2Hx PAs0.2 Mo1oVOy heteropoly acid for selective oxidation of isobutane were also tested in a continuous flow fixed-bed reactor. The results showed that the replace of H^＋ of heteropoly acid by metal cations can greatly increased the ability of catclytic oxidation of the heteropoly acid. Among these metal cations, Fe^3＋ can markedly improve the activity of the heteropoly acid, but Cu^2＋ increased the selectivity of acrylic acid.

关 键 词：过渡金属离子 杂多酸 异丁烷 催化性能 选择性氧化 

分 类 号：O643.5[理学—物理化学]