NOVEL GLUCOSE AND CELLULOSE DERIVED DUAL-FUNCTIONAL NI@C-SO3H CATALYST FOR LIQUID PHASE PHENOL HYDRODEOXYGENATION

摘要

Carbon black and activated carbon were produced by pyrolysis of two carbon precursors-glucose and cellulose-resulting in graphitic respectively graphene like structures. The nature, morphology and structure of complete and incomplete carbonized materials have been studied on sulfuric acid treatment for introducing surface acid sites. The SO3H bearing carbon is used for supporting Nickel nanoparticles synthesized by four different methods. The dual functional catalyst synthesized by grafting as-synthesized nickel nanoparticles supported on SO3H-carbon was designed to fulfill a cascade reaction of four subsequent reactions of phenol hydrodeoxygenation. Liquid phase phenol HDO undergoes hydrogenation via cyclohexanone to cyclohexanol, its subsequent dehydration and cyclohexene hydrogenation to cyclohexane. The synthesized stable Nickel nanoparticles are highly effective for phenol hydrogenation. Cyclohexanol is dehydrated in an elimination reaction on the surface acid sites of sulfuric and carboxylic groups. The balance of highly dispersed Nickel nanoparticles and sulfuric acid sites plays a margin role on its activity in hydrogenation subsequently dehydration catalyzed reactions.