三种多金属氧酸盐的制备及催化H2 O2氧化淀粉性能比较

摘要

以磷钼钒多阴离子[ PMo11 VO40]4-、[ PMo10 V2 O40]5-、[ PMo9 V3 O40]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](OP-MoV2)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 Keg-gin? tpye polyoxoanions ( [ PMo11 VO40 ] 4-,[ PMo10 V2 O40 ] 5- and[ PMo9 V3 O40 ] 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] 4 H[ PMo10 V2 O40 ] ( OPMoV2 ) is used as catalyst.