Pd/mpg-C_3N_4对四溴双酚A的催化加氢脱溴研究

Liquid phase catalytic hydrogenation of tetrabromobisphenol-A over palladium doped on modified graphitic carbon nitride

以单氰胺为前驱体,使用硬模板法制备介孔石墨相氮化碳(mpg-C_3N_4),并采用光沉积法制备载钯介孔石墨相氮化碳(Pd/mpg-C_3N_4)催化剂。对所得催化剂进行表征,结果表明Pd/mpg-C_3N_4存在介孔结构,具有较高的比表面积,且Pd颗粒均匀地分散于mpg-C_3N_4表面。将Pd/mpg-C_3N_4催化剂用于四溴双酚A(TBBPA)的液相催化加氢脱溴反应中,该催化剂表现出良好的催化活性。Pd/mpg-C_3N_4催化剂的活性与表面Pd^(2+)含量呈正相关;反应过程可用Langmuir-Hinshelwood模型来描述,表明TBBPA在催化剂表面的吸附是反应的控制步骤。

Pd doped mesoporous graphitic carbon nitride catalysts（Pd/mpg-C_3N_4）were synthesized via a photodeposition method.The prepared catalysts were characterized.Characterization results indicated that Pd/mpg C_3N_4 was synthesized with the structure of mesoporous and higher specific surface area.The Pd particles were well-distributed onto the surface of mpg-C_3N_4.Their catalytic performance was examined by the liquid phase catalytic hydrogenation of tetrabromobisphenol-A（TBBPA）.The liquid phase catalytic hydrogenation of tetrabromobisphenol-A over Pd/mpg-C_3N_4 showed high catalytic activity.It turned out that the catalytic activity of Pd/mpg-C_3N_4 is positively associated with Pd^（2＋） on the surface of the support.Also,the process of the liquid phase catalytic hydrogenation of TBBPA can be described by the model of Langmuir-Hinshelwood,which indicated that the control procedures of catalytic hydrogenation is the absorption of TBBPA on the surface of the catalysts.