| Recently, due to the rapid development of aviation transportation, the consumption of aviation fuel is continually increasing. The using of aviation kerosene refined from crude oil increases the greenhouse gas(GHG) emission. In order to mitigate these GHG emission in the aviation industry and to ensure the sustainable development of the aviation fuel, pursuing low-carbon emissions and exploring the renewable raw materials of aviation biofuels have drawn great attention by aviation fuel producers all over world. In this work, the crude bio-oil(CBO) was derived from the cornstalk by hydrothermal liquefaction(HTL), and then the CBO was upgraded via catalytic hydrogenation to obtain the high quality bio-oil. Finally, the upgraded bio-oil(UBO) and aviation fuel were mixed directly at different ratios. The properties and components of the UBOs and the blended fuels were analyzed by chromatography mass spectrometry(GC-MS), infrared spectroscopy(FT-IR), elemental analysis and petroleum products characteristics analyzers etc.Initially, HTL was carried out in an autoclave with the temperatures and reaction times in the range of 280 to 360 ? and 30, 60 and 90 min, respectively. The result shows that the highest yield of the CBO(42.3wt%) and feedstock conversion(69.9%) were achieved at 320 ? and hold for 60 min. Secondly, according the liquefaction results, the CBO which was used to upgrade was obtained via the liquefaction of cornstalk using pilot-scale autoclave. At last, catalytic hydrodeoxygenation(HDO) of the cornstalk crude bio-oil over bimetallic Ni-Mo as a dispersed catalyst at different temperatures(280-370?) were conducted under supercritical ethanol with 4MPa, 60 min reaction time. The result shows that the yield of UBO was decreased with the increase in reaction temperature, but it was beneficial in improving the physicochemical properties, and higher temperature is helpful for the deoxygenation, but it did not seem obvious to hydrogenation. The upgrading process significantly removed most of the oxygen-containing functional groups, whereas hydrocarbons significantly increased and the compositions were retuned.The bio-oil distilled from the 370 ? upgraded bio-oil(D-UBO)in the boiling range of 150 to 250 ?, which was used to mix with the RP-3 aviation fuel. The D-UBO was mixed with the aviation fuel at the volume ratio of 1:0, 1:1, 1:4, 1:9 and 1:19 to obtain the aviation biofuels. The result shows that the physicochemical properties and desired products of D-UBO are better than UBO(without further treatment) and mixed well with RP-3 aviation fuel. With the increasing of mix proportion, the physicochemical properties of the aviation biofuel are being drawn closer to RP-3. Compared with aviation fuel, at the mix proportion of 1:19, the total acid number(TAN) of the aviation biofuel increases, but the degree of cooper corrosion is not obvious. Moreover, the existent gum of the aviation biofuel decrease with the increase in blend ratios, but still cannot meet the criteria. However, other indicators of the mixed fuels have conformed to the combustion criteria, which demonstrated the possibility of CBO upgraded by the hydrogenation over bimetallic Ni-Mo as a dispersed catalyst under supercritical ethanol to produce an alternative aviation biofuels. |
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