Construction And Performance Study Of A Highly Efficient Catalytic Biomass Furfural Selective Transfer Hydrogenation Syste

At present,with the continuous consumption of fossil energy and the increasingly serious global ecological damage,the development and application of a green,clean and renewable energy has attracted much attention.Biomass,as the most abundant and renewable carbon resource on Earth,can produce furfural on a commercial scale from lignocellulosic biomass,and its hydrogenated products and derivatives are of great value in energy and fine chemicals.For example,γ-valerolactone（GVL）and furfuryl alcohol（FAOL）are value-added chemicals that can be formed by the transfer and hydrogenation of furfural,and are widely used in the chemical industry.In this study,alcohol was used as solvent and hydrogen source,and two strategies of thermal catalysis and photocatalysis were explored to achieve the transfer hydrogenation of furfural into GVL and FAOL,respectively,providing a new research idea for the conversion of biomass to value-added chemical raw materials.The main contents of the study include:（1）Multiple active sites were released by in-situ hydrolysis of ZrCl₄,and GVL was obtained by five-step reaction of furfural in one pot.The activity of the reaction system was tested.The results showed that when the reaction temperature was 180°C,the reaction time was 6 h,6 m L isopropyl alcohol was used as solvent and hydrogen donor,and the catalyst dosage was 0.4 mmol without exogenous water,the yield of furfural conversion to GVL was the best,which could reach 56%.However,the solid hydrolysis product ZrO（OH）_x·n H₂O of the catalyst was recovered and characterized,and it was treated with simple calcination to obtain ZrO₂.ZrO₂ was characterized and then used in the transfer hydrogenation of furfural to reduce furfuryl alcohol.Optimize the conditions for the reaction.The results showed that when the reaction temperature was 150°C,the reaction time was 5 h,6 m L isopropyl alcohol was used as solvent and hydrogen donor,and the catalyst dose was 0.05 g,about 80%furfuryl alcohol was obtained.ZrO₂ catalyst was prepared by precipitation method for comparison,and the reason of the difference in catalytic activity was analyzed.In addition,the mechanism of the system is also discussed.（2）ZnIn₂S₄/C₃N₄ photocatalyst was prepared by microwave method.It catalyzed the transfer and hydrogenation of furfural to furfural alcohol under light condition,and realized the direct conversion of light energy into chemical energy under low temperature condition,reducing the energy loss.The single factor optimization of the system showed that the reaction temperature was 20°C,the reaction time was 6 h,the reaction time was 10 W blue lamp,5 m L isopropyl alcohol as solvent and hydrogen donor,KOH was used to adjust the alkaline environment system,and under the protection of nitrogen,when the amount of catalyst was 0.015 g,the yield of furol alcohol was the best,about 42%.In addition,the morphology and optical properties of the catalyst were also characterized.