Abstract
To reduce the oxygen content and increase the higher heating value (HHV) of bio-oil, this paper proposed a new method for deoxy-liquefaction of corn stalk in subcritical water with hydrogen generated in situ via aluminum–water reaction. The effects of aluminum on the physicochemical properties of bio-oil were investigated. The bio-oil was analyzed by elemental analysis, Fourier transform infrared spectroscopy (FT-IR), and gas chromatography–mass spectrometry (GC–MS). The results showed that, when the aluminum content was 30 wt %, the yield of bio-oil reached 26.54 wt %, the deoxidation ratio was 47.92%, and the calorific value increased from 28.86 to 33.77 MJ/kg. The viscosity, acid value, and water content were also significantly improved. FT-IR analysis showed that the types of functional groups in bio-oil were almost unchanged. GC–MS analysis showed that the main components of bio-oil were phenols, ketones, hydrocarbons, and indoles. In addition, the content of aliphatic hydrocarbons and aromatic hydro...
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