PdAg/CDs复合催化剂的制备及其葡萄糖氢解性能研究

Preparation of the PdAg/CDs composite and its catalytic performance in the hydrogenolysis of glucose

以碳点(carbon dots,CDs)为还原剂和载体,采用简便的光照还原法制备出了PdAg/CDs复合催化剂。XRD、TEM、FT-IR和XPS等技术对催化剂的表征分析,结果表明该催化剂平均粒径为10.45 nm,Pd和Ag主要以零价态的合金形式负载在碳点表面。将PdAg/CDs复合催化剂用于水中葡萄糖的氢解,催化评价结果表明,在初始H2压力为4 MPa、葡萄糖100 mg、催化剂25 mg、反应温度140℃的条件下反应3 h,该催化剂显示出较好的氢解活性,葡萄糖的转化率为68.85%,氢解产物丙酮醇的收率达到8.36%。

With carbon dots(CDs)as the reducing agent and support,a PdAg/CDs composite catalyst was prepared by simple light reduction method.The results of XRD,TEM,FT-IR and XPS characterization indicate that the PdAg/CDs composite has an average particle size of about 10.45 nm,where Pd and Ag exist on the surface of CDs mainly in the alloy form of zero valence.The catalytic performance of the PdAg/CDs composite was evaluated in the hydrogenolysis of glucose in water.The results illustrate that the PdAg/CDs composite catalyst is highly active in the glucose hydrogenolysis;after reaction for 3 h under 140℃,4 MPa of initial H2 pressure,100 mg of glucose and 25 mg of catalyst,the conversion of glucose is 68.85%and the yield of acetol reaches 8.36%.