Lignin Porous Carbon Materials For Benzyl Alcohol Oxidation

Benzaldehyde is an important organic intermediate with a wide range of applications in medicine,dyes,spices and food.Liquid-phase benzyl alcohol oxidation to benzaldehyde is a green synthesis technology due to its mild reaction conditions and fewer by-products.Efficient and stable catalytic materials for liquid-phase benzyl alcohol oxidation is highly desirable.CoCl2-KCl can form molten salt.Cobalt-lignin porous carbon material was prepared by using CoCl2-KCl as the pore-forming agent.The synthesized cobalt-lignin porous carbon material was characterized by SEM,TEM,EDS,FT-IR.The structural characteristics of cobalt-lignin porous carbon materials were studied.The cobalt-lignin porous carbon materials were applied for benzyl alcohol oxidation.At 120?,39.4%of benzaldehyde was obtained after 6 h.The yield of benzaldehyde did not decrease significantly after the catalyst being recycled 5 times.The zirconium phosphate-lignin porous carbon material was synthesized based on the interaction of oxygen-containing groups on the surface of lignin porous carbon material,zirconium ions,polyvinylpyrrolidone(PVP)and phosphoric acid.The synthesized zirconium phosphate-porous carbon material was characterized by SEM,EDS and FT-IR,and the structural of the zirconium phosphate-lignin porous carbon material were studied.The activity of zirconium phosphate-lignin porous carbon material on the selective catalytic oxidation of benzyl alcohol to benzaldehyde in acetonitrile was investigated.At 37?,73%of benzyl alcohol conversion was reached after 30 minutes.No obvious decrease of benzaldehyde yield was shown after the catalyst being recycled 5 times.