Abstract
In this paper, glucose, xylan and lignin were selected as typical components of lignocellulosic biomass to conduct liquefaction experiments, and the effect of alkali and alkaline earth metals (AAEMs) on biomass liquefaction in ethanol was investigated. Alkaline earth metals (AEMs) had a positive catalytic effect on the yield and quality of xylan liquefied bio-oil, in particular, MgCl2 increased the yield of bio-oil from 26.6 wt% to 38.8 wt%. AAEMs inhibited the formation of glucose and lignin bio-oil, the yield of bio-oil was changed from lignin > glucose > xylan to lignin > xylan > glucose. AAEMs increased the content of ester compounds in bio-oil, inhibited the formation of long-chain aliphatic compounds, and promoted the transformation of macromolecular aromatic compounds into coke. The active catalytic sites of AAEMs were gradually covered by the adsorption of residues and carbon free radicals, blocking the active sites. The ability of carbon free radical to capture H source was weakened, and the transfer of active hydrogen to bio-oil was inhibited, which was not conducive to the improvement of higher heating value (HHV) of bio-oil.
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