杂多化合物催化性能的研究——第四周期过渡金属钼磷三元杂多化合物的合成及表征

RESEARCH ON HETEROPOLY COMPOUNDS AS CATALYSTS ——PREPARATION AND CHARACTERIZATION OF MOLYBDOPHOSPHATE CONTAINING THE FOURTH PERIOD TRANSITION-METAL ELEMENTS

本文用改进的方法成功地合成了以第四周期二价过渡金属离子取代12-钼磷杂多酸中的一个钼,并保持Keggin结构的五个新化合物:Na_5[PZ(H_2O)Mo_(11)O_(39)·5H_2O,其中Z分别为Mn、Co、Ni、Cu、Zn,并利用红外光谱及热分析等手段对合成产物的结构及热稳定性作了系统的研究,结果表明,合成产物与12-钼磷杂多化合物具有类似的结构,但合成产物的热稳定性明显低于12-钼磷杂多化合物。

By the use of improved procedures, the sodium salts of the fourth period bivalent transition-metal ions substituted heteropolymolybate complexes, Na5[PZ(H2O)Mo11O39] ?5H2O (Z = Mn, Co, Ni, Cu, Zn), have been prepared. The character and thermal stability for these complexes arc systematically studied by use of IR spectra and thermal analysis methods. The results show that these complexes keep Keggin structure, but their thermal stability are distinctly lower than 12-molybdophosphoric acid.