CATALYTIC HYDRO-LIQUEFACTION OF SAWDUST INTO HIGH-VALUE SMALL-MOLECULAR CHEMICALS OVER A NOVEL MAGNETIC SOLID SUPER-BASE CATALYST

摘要

Selective hydrogenolysis of aromatic carbon-oxygen(C-O)nbonds is challenging because of the strength and stability of thesenlinkages (4, 5). The cleavage of bridged bonds (BBs), especially C-Onbridged bonds, in coals and biomass is one of the most importantnreactions for the hydrogenation liquefaction and efficient utilizationn(6,7). However, most processes to recover energy from coal or tonconvert it to higher valued products depend on the major chemicalnchanges that occur when coal is heated above 350-400 oC (8). Thesenhigher temperatures leading to severe increase in the yields of bothngases and heavy products with huge energy consumption (9,10). Biooilsnhave been identified as renewable liquid fuel that can benproduced from lignocellulosic biomass (11-13). Pyrolysis of biomassnhas been shown to be cheaper than biomass conversion technologiesnbased on gasification or fermentation processes (14). But, bio-oils arenlow-quality fuels that cannot be used in conventional gasoline orndiesel fuel engines because they are immiscible with petroleumderivednfuels, on account of their high oxygen, acid, and waterncontent (11, 15). Brown coal’s polymeric network contains aromaticnC-O bonds inherited from biomass (16), yet, selective cleavage of COnbond is important for the conversion of coal or biomass tondeoxygenated fuels and commercial chemicals (17-19).nConsequently, selective cleavage of C-O bond at a lower temperaturenin the presence of a proper catalyst is the key of hydrogenationnliquefaction and model reactions.