溶剂对Pd/C催化四氯化碳液相加氢反应的影响

考察了活性组分、载体、Pd含量及溶剂对四氯化碳液相催化加氢转化为氯仿反应的影响。实验结果表明，质量分数0.5%的Pd/C是四氯化碳液相催化转化的较优催化剂。溶剂对该反应的速率和产品分布有显著影响，在正庚烷、甲苯和甲醇3种溶剂中，甲醇最利于提高Pd/C催化剂的活性，且四氯化碳转化的平均反应速率随着甲醇含量的增加呈现先增大后减小的趋势，氯仿的选择性随着甲醇含量的增加有所降低。当甲醇和四氯化碳的体积比为2∶1时，四氯化碳转化速率最高。甲醇和四氯化碳的体积比为1∶10时，氯仿的选择性达90%。

Effects of solvent on liquid phase hydrogenation of carbon tetrachloride over Pd/C catalyst

Liquid phase hydrogenation of carbon tetrachloride to chloroform over supported metal catalysts was studied. The effects of metal components, support, palladium content and solvent on the catalytic behaviors were investigated in a 100 mL autoclave. The results showed that 0.5%Pd/AC catalyst exhibited superior catalytic activity; solvent played an important role in the reaction; methanol exhibited best amongn-heptane, toluene and methanol solvents.Carbon tetrachloride conversion increased first and then declined with increasing methanol content,while selectivity to chloroform declined slightly with increasing methanol content. Maximum carbon tetrachloride conversion rate was obtained over 0.5%Pd/AC catalyst at methanol-to-carbon-tetrachloride volumetric ratio of 2∶1. Selectivity to chloroform of up to 90% was attained at methanol-to-carbon-tetrachloride volumetric ratio of 1∶10.