活性炭负载FeCl_3胶体催化剂催化苯羟基化制苯酚

采用水热合成法制备FeCl3胶体,并通过浸渍法制备活性炭负载FeCl3胶体催化剂,考察了该催化剂对苯羟基化反应的催化性能。通过XRD、SEM、TEM、FTIR、BET和勃姆滴定等技术对活性炭和催化剂的结构进行了表征。实验结果表明,经硝酸处理后的活性炭中含氧官能团的含量增加,且酸性增强,有利用于FeCl3胶体在活性炭表面的负载和分散。该活性炭负载FeCl3胶体催化剂显示了较高的催化苯羟基化反应活性,在反应温度60℃、反应时间6 h、n(H2O2)∶n(苯)=4、苯用量0.5mL、乙腈用量5 mL、催化剂用量0.38 g、FeCl3胶体负载量3 mmol/g时,苯转化率为50.2%,苯酚选择性为99.2%。

Hydroxylation of Benzene to Phenol over FeCl3 Colliod /Activated Carbon Catalyst

FeCl3colloid was synthesized through a hydrothermal method and FeCl3colloid/activated carbon(FeCl3/AC) catalysts were prepared by an impregnation method.The activity and selectivity of the FeCl3/AC catalysts in the hydroxylation of benzene to phenol were evaluated.The structure of the FeCl3/AC catalysts and AC was characterized by means of XRD,SEM,TEM,FTIR,BET and Boehm titration.The results showed that after AC was treated with nitric acid,the oxygen functional groups on it increased and the acidity was enhanced,which were beneficial to loading and dispersion of the FeCl3colloid on the AC surface.Under the optimum conditions of reaction temperature 60 ℃,reaction time 6 h,n(H2O2)∶n(benzene) 4,benzene dosage 0.5 mL,acetonitrile dosage 5 mL,FeCl3/AC catalyst dosage 0.38 g and FeCl3colloid loading 3 mmol/g,the conversion of benzene and the selectivity to phenol could reach 50.2% and 99.2%,respectively.