石墨烯负载钯纳米颗粒催化5-羟甲基糠醛选择氧化制2,5-呋喃二甲酸

Graphene-supported Pd Nanoparticles for Selective Oxidation of 5-hydroxymethylfurfural into 2,5-furandicarboxylic Acid

采用甲醛液相还原法制备石墨烯负载Pd纳米颗粒催化剂,利用HRTEM、STEM、HAADF、XPS、TG、XRD、N2物理吸附、CO脉冲化学吸附等手段对样品进行表征。结果显示,高比表面积石墨烯作为催化剂载体,有助于获得高分散和金属态为主的Pd纳米颗粒。HMF催化氧化实验表明,Pd/rGO催化剂能够高效催化HMF转化为FDCA。50℃常压反应6h,HMF转化率和FDCA的收率分别为96.9%和66.6%。反应动力学结果显示,HMF转化和生成FDCA的活化能分别为(45.6±4.6)kJ/mol、(71.3±2.5)kJ/mol。

Graphene supported Pd nanoparticles was prepared using formaldehyde liquid phase reduction.The catalyst was thoroughly characterized by HRTEM,STEM,HAADF,XPS,TG,XRD,nitrogen physisorption and CO pulse chemisorption.The characterization results revealed that graphene with high specific surface area as catalyst support was conducive to obtaining the high dispersion and metal-dominated Pd nanoparticles.The analysis of HMF oxidation proved that the Pd/rGO catalyst could efficiently convert HMF into FDCA with 96.9% HMF conversion and 66.6% FDCA yield after 6hreaction at 50℃in atmospheric pressure.According to the reaction kinetics,the activation energies of HMF conversion and FDCA formation were determined to be（45.6±4.6）kJ/mol and（71.3±2.5）kJ/mol,respectively.