Abstract
The effective hydro-liquefaction process of sawdust is proposed over different ionic liquid Ni-based catalysts at 320 °C. This study investigated the relationship between ionic liquid composition and catalytic performance. The maximum sawdust conversion of 83.11% and liquid yield of 52.38% were achieved over the catalytic system including nickel chloride and 1-butyl-3-methyllimidazolium bromide ([Bmim]Br), suggesting that the anion in ionic liquid played an vital role on the sawdust hydro-liquefaction. The defined impact index was provided to further evaluate the liquefaction performance using ionic liquid Ni-based catalyst. The largest impact index obtained from [Bmim]Br/NiCl2 was in agreement with its excellent catalytic liquefaction performance. The analysis of ionic liquid Ni-based catalyst indicated the coordination interaction between ionic liquid and nickel chloride, which would be favorable to feedstock conversion and improve the bio-oil quality.According to the component distribution, the introduced ionic liquid Ni-based catalytic system was beneficial to sawdust cracking, resulting in the increased amount of smaller compounds. Additionally, the oil compositions highly depended on the employed type of ionic liquid.
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