杂多化合物的催化性能研究——第四周期过渡金属取代的三元钼磷杂多化合物在H_2O_2分解反应中的催化作用

On the Catalytic Behaviour of Heteropoly Compounds Substituted by Divalent-metals of Fourth Period in the Decomposition of H_2O_2

在合成缺位取代的钼磷杂多化合物Na_5[PM(H_2O)Mo_(11)O_(39)]·5H_2O[M=Mn^(2+)、Co^(2+)、Ni^(2+)、Cu^(2+)、Zn^(2+)的基础上,研究了它们在H_2O_2分解反应中的催化活性规律.并与相应的硫酸盐MSO_4在同一反应中的催化活性规律作了比较,发现虽在活性上缺位的杂多化合物较之硫酸盐高,但对过渡金属而言,其活性顺序是一致的.在此基础上,以含铜缺位取代的杂多化合物和CuSO_4为例,对它们在H_2O_2分解反应中的催化动力学性质作了深入的研究,对反应机理作了讨论.

In this paper, the catalytic activity of lacunary substituted heteropoly complex Na5[PM(H2O) Mo11O39] ?nH2O(M = Mn2+, Co2+, Ni2+ , Cu2+ , Zn2+) has been investigated for decomposition of hydrogen peroxide. This series of heteropoly complexes is more active for given reaction than that of the divalent-metal sulfates. The order of activities is as follows: Cu2+, Fe3+》Mn2+>Ni2+>Zn2+. Over the special example PCuMo and CuSO4, we investigated the catalytic kinetics of the mentioned reaction. Based on the kinetic data and in-situ UV spectrophometric results, the reaction mechanism has been studied and discussed in detail.