Preparation Of Carbon Supported Cu-based Catalysts And Their Catalytic Directional Conversion Of Furfural

Furfural,as one of the biomass platform molecular compounds,contains active aldehyde group and furan ring in its structure,which can be converted into a variety of high value-added derivatives by catalytic hydrogenation.The design of high efficiency hydrogenation catalyst is the key to realize the high value utilization of furfural.Although noble metal-based catalysts usually have high catalytic activity,these catalysts are easy to lead to excessive hydrogenation and reduce the selectivity of target products.Therefore,heterogeneous catalysts based on non-noble metals are more likely to become an efficient and more suitable catalyst for industry.In recent years,a series of catalytic systems based on non-noble metals such as Fe,Co,Ni and Cu have been developed,but most of these catalytic systems have low activity and poor stability.In view of the above problems,this study intends to construct a high-activity and high-stability furfural directional conversion catalyst with the help of the confinement effect of porous carbon materials,and explore its mechanism.The main contents of this thesis are as follows:Using glucose as carbon source,Cu Zn/C catalyst was prepared by impregnation-pyrolysis method.The characterization results showed that the addition of Zn promoted the dispersion of Cu particles and improved the activity of the catalyst.The catalyst showed good catalytic performance in the directional conversion of furfural to 2-methylfuran,that is,the yield of dimethylfuran was not less than 95.2%.And the catalyst can still reach100.0%of the furfural conversion rate after being used for four times.Cu and Zn modified N-doped graphene（Cu₅Zn@NG）catalysts were prepared by one-pot ammonia evaporation using graphene as the support.The results showed that the addition of Zn promoted the dispersion of Cu nanoparticles and improved the activity of the catalyst.The catalyst has good catalytic performance for the reaction of directionally converting furfural into furfuryl alcohol.Under the optimum reaction conditions,the yield of furfuryl alcohol was close to 99.0%,and the catalyst showed good stability in five cycles.Using Cu-BDC as template and benzimidazole as nitrogen source,Cu@CN₁-400catalyst with excellent performance was prepared by one-step pyrolysis method.The doping of N heteroatoms makes the layered structure of the catalyst more obvious,so that the catalyst has a better pore structure and the nature of the active center is modulated.The catalyst can realize the directional conversion of furfural into furfuryl alcohol under mild conditions,and the catalyst can still maintain high activity after being used for 10 times.