石墨烯负载MnO2催化甲苯选择性氧化制备苯甲醛

Selective oxidation of toluene to benzaldehyde by graphene nanosheets supported MnO2 catalyst

采用浸渍法制备了石墨烯(Graphene Nanosheets,GN)负载MnO 2催化剂,用于甲苯选择性氧化生成苯甲醛。对催化剂的表征和实验结果表明,10%-MnO 2/GN催化剂[w(MnO 2)]=10%结合抑制剂加入,反应的转化率为8.45%,产物中苯甲醛的选择性为53.78%,苯甲酸的选择性降低至10.31%,过度氧化受到了有效的控制。石墨烯作为新型碳材料,内部具有六角形二维结构,MnO 2晶粒负载于六角形内部,分散均匀,比表面积为50.9 m^2/g,MnO 2以α和β晶相的混合形式存在。

The graphene nanosheets supported MnO 2 catalysts were prepared by impregnation method,which were used for selective oxidation of toluene to benzaldehyde.Combined the characterization and experimental results,we found that 10%-MnO 2/GN(Graphene Nanosheets)catalyst and inhibitor could achieve the selective oxidation process of toluene effectively.The conversion of toluene could reach 8.45%and the selectivity of benzaldehyde could reach 53.78%,and the selectivity of benzoic acid could fall to 10.31%,so the excessive oxidation process was controlled.As a novel carbon material,graphene has unique hexagonal two-dimensional structure.MnO 2 grain was loaded on the inner hexagonal micro structure,and the dispersal was homogeneous.The specific surface area of this catalyst was 50.9 m 2/g and the MnO 2 existed as a mixture ofαandβcrystalline phases.