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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。
The graphene loaded Pd nanoparticles were prepared by the liquid phase reduction method of formaldehyde. The samples were characterized by HRTEM, STEM, HAADF, XPS, TG, XRD, N2 physisorption and CO pulse chemisorption. The results show that high specific surface area graphene as a catalyst carrier, help to obtain highly dispersed and metal-based Pd nanoparticles. The experiment of HMF catalytic oxidation shows that Pd / rGO catalyst can efficiently catalyze the conversion of HMF to FDCA. At 50 ℃ for 6h, the conversion of HMF and the yield of FDCA were 96.9% and 66.6%, respectively. The kinetic results showed that the activation energies of HMF and FDCA were (45.6 ± 4.6) kJ / mol and (71.3 ± 2.5) kJ / mol, respectively.