Dawson型磷钼钒杂多酸盐催化合成二苯基甲烷

合成了Dawson型磷钼钒杂多酸盐Fe2H2P2Mo16V2O62·41H2O,采用感耦等离子体发射光谱(ICP)、傅里叶变换红外光谱(IR)、X射线衍射(XRD)、热重分析(TG)表征了杂多酸化合物的结构,并将其用于苯与氯化苄烷基化合成二苯基甲烷的反应中。考察了反应物的用量、催化剂用量、反应温度、反应时间对烷基化反应的影响。结果表明,在催化剂用量为0.1 g,氯化苄用量为10 mmol,苯与氯化苄的摩尔比n(C6H6)∶n(C7H7Cl)=6∶1,反应时间1 h,反应温度80℃的条件下,氯化苄的转化率达到99.5%,二苯基甲烷的选择性达到98.7%。Fe2H2P2Mo16V2O62·41H2O催化剂表现出了很好的催化活性。

Dawson structure P-Mo-V heteropolyacid salt catalyst in synthesis of diphenylmethane

The heteropolyacid salt Fe2H2P2Mo16V2O62•41H2O catalyst was prepared, and characterized by inductive coupling plasma emission spectrum, Fourier transform infrared spectroscopy, X-ray powder diffraction, and thermal analysis. In this work, the catalytic activity was studied for alkylation of benzene with benzyl chloride to diphenylmethane. The influences of different parameters such as the amount of reactants, the reaction temperature, and the reaction time on alkylation of benzene were also investigated. Experimental results show that Fe2H2P2Mo16V2O62 was found to be a suitable catalyst for the alkylation of benzene with benzyl chloride to diphenylmethane. A maximum of conversion of benzyl chloride was obtained to be 99.5% with selectivity to 98.7% for diphenylmethane under the optimized reaction conditions over Fe2H2P2Mo16V2O62•41H2O.