老化处理促进Cu/SiO2原位还原增强糠醛加氢制糠醇反应性能OA

The selective hydrogenation of biomass-derived furfural to furfuryl alcohol is one of the important approaches for the conversion and utilization of biomass resources.Although Cu/SiO2 catalysts are widely employed in industry for hydrogenation,their catalytic activity in furfural hydrogenation remains insufficient.A series of Cu/SiO2 catalysts were prepared by co-precipitation method and then subjected to aging treatment at room temperature,60℃,80℃,100℃ and 120℃,respectively.The effects of aging temperatures on catalytic performances of Cu/SiO2 catalysts for furfural hydrogenation to furfuryl alcohol were investigated,and the variations of catalyst structures before and after reaction were analyzed.The results show that under the optimal reaction conditions of 20 mL furfural,0.2 g catalyst,reaction temperature of 180℃,reaction pressure of 3.5 MPa and reaction time of 2 h,the catalyst aged at 60℃(Cu/SiO2(60))exhibits excellent catalytic performance,achieving furfural conversion rate of 99.0％and furfuryl alcohol selectivity of 96.2％.The appropriate aging temperature(60℃)can promote the in-situ reduction of Cu2+species to active Cu0 and Cu+species during reaction process effectively,which can enhance the dispersion of Cu species and reduce their particle sizes,thereby significantly improving the catalytic performance of catalyst.