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在合成一种新的杂多化合物(K13PV12Cr2O42)的基础上,进一步考察了反应温度、过氧化氢起始浓度,以及该杂多化合物作为催化剂时的用量对过氧化氢分解反应的催化作用;并将其与同结构的杂多化合物K7PV12Mo2O42对该反应的催化作用进行了比较。在30～50℃范围内得到了催化反应的速率常数,并由Arrhenius公式计算出反应的活化能约为70.63kJ·mol-1,表明所合成杂多化合物对H2O2分解具有良好的催化性能,也说明Cr3+对V5+的取代有助于改善杂多化合物的催化性能。推导出了H2O2催化分解反应的速率方程。
On the basis of synthesizing a new heteropoly compound (K13PV12Cr2O42), the reaction temperature, the initial concentration of hydrogen peroxide and the catalytic effect of the heteropoly compound as a catalyst on the decomposition reaction of hydrogen peroxide were further studied. The catalytic activity of this compound with K7PV12Mo2O42, a heteropoly compound of the same structure, was compared. The rate constants of the reaction were obtained in the range of 30-50 ℃. The activation energy of the reaction was calculated to be about 70.63kJ · mol-1 by Arrhenius formula, indicating that the synthesized heteropoly compounds have good catalytic performance for H2O2 decomposition. This shows that the substitution of Cr3 + for V5 + helps to improve the catalytic performance of heteropoly compounds. The rate equation of H2O2 catalytic decomposition was deduced.