NiH6P2Mo16V2O62催化氧化苯制苯酚的动力学

摘要

Dawson type molybdovanadophosphoric heteropoly compounds NiH6P2Mo16V2O62 were synthesized by acid-base neutralization method and characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD).With the NiH6P2Mo16V2O62 as catalyst, the kinetics of the direct hydroxylation of benzene to phenol was studied by the initial rate method.The results show that the hydroxylation reaction rate of benzene, oxidant of aqueous hydrogen peroxide and catalyst is first-order and the activation energy of reaction is 31.47 kJ/mol.According to the model, inferring that transition metal Ni only plays subsidiary role on catalytic reaction.%根据酸碱中和的原理制备了Dawson型磷钼钒镍杂多酸盐NiH<,6>P<,2>Mo<,16>V<,2>O<,62>,采用傅里叶变换红外光谱(FT-IR),X射线衍射(XRD)对所制备磷钼钒镍杂多化合物进行了表征.以磷钼钒镍杂多酸盐作为催化刺,采用初始速率的方法研究了过氧化氢一步将苯氧化为苯酚动力学行为.结果表明:该羟基化反应速率对底物苯、双氧水和催化剂都是一级反应,反应活化能为31.47 kJ/mol,根据所建模型推测过渡金属Ni对催化反应只起到辅助作用.