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) bonds is challenging because of the strength and stability of these linkages (4, 5). The cleavage of bridged bonds (BBs), especially C-O bridged bonds, in coals and biomass is one of the most important reactions for the hydrogenation liquefaction and efficient utilization (6,7). However, most processes to recover energy from coal or to convert it to higher valued products depend on the major chemical changes that occur when coal is heated above 350-400 ° C (8). These higher temperatures leading to severe increase in the yields of both gases and heavy products with huge energy consumption (9,10). Bio- oils have been identified as renewable liquid fuel that can be produced from lignocellulosic biomass (11-13). Pyrolysis of biomass has been shown to be cheaper than biomass conversion technologies based on gasification or fermentation processes (14). But, bio-oils are low-quality fuels that cannot be used in conventional gasoline or diesel fuel engines because they are immiscible with petroleum- derived fuels, on account of their high oxygen, acid, and water content (11, 15). Brown coal’s polymeric network contains aromatic C-O bonds inherited from biomass (16), yet, selective cleavage of C- O bond is important for the conversion of coal or biomass to deoxygenated fuels and commercial chemicals (17-19). Consequently, selective cleavage of C-O bond at a lower temperature in the presence of a proper catalyst is the key of hydrogenation liquefaction and model reactions.