三种多金属氧酸盐的制备及催化H_2O_2氧化淀粉性能比较

The Preparation of Three Polyoxometalates and Comparison of Catalytic Oxidative Starch with Hydrogen Peroxide

以磷钼钒多阴离子[PMo11VO40]4-、[PMo10V2O40]5-、[PMo9V3O40]6-为构建基元,分别和1-辛基-3-甲基咪唑阳离子通过离子交换反应制备三种多金属氧酸盐。以这三种多金属氧酸盐为氧化性催化剂,可溶性淀粉为原料,双氧水为氧化剂,应用于淀粉氧化实验并比较它们的催化氧化活性。试验结果显示,三种催化剂均具有较好的催化性能,其中用[Omim]4H[PMo10V2O40](OPMo V2)作催化剂时氧化淀粉中的羧基含量最高。

Three catalysts were prepared by straightforward ion exchange reaction of 1- octyl- 3- methyl imidazolium cation and Keggin? tpye polyoxoanions( [PMo11VO40]4-,[PMo10V2O40]5-and[PMo9V3O40]6-). We explored the oxidation of starch with hydrogen peroxide as oxidant and polyoxometalates as catalyst,and compared the catalytic activity of three kinds of polyoxometalate. The results showed that three kinds of catalysts had better catalytic performance,and the carboxyl content was the highest in the oxidized starch when the [Omim]4H[PMo10V2O40]( OPMo V2) is used as catalyst.