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Understanding the enhanced production of poly-aromatic hydrocarbons during the pyrolysis of lignocellulosic biomass components under pressurized entrained-flow conditions
The entrained-flow pressurized pyrolysis of lignin, cellulose, and xylan was investigated to determine the composition of pyrolysis products and the reaction mechanisms. The influence of biomass components (lignin, cellulose, and xylan) and pyrolysis conditions was investigated. The results showed that under atmospheric pressure, the decomposition of lignin formed saturated aliphatic hydrocarbons (SAHCs), phenolics, and PAHs, while cellulose and xylan mainly generated phenolics, sugars, carbonyls, alcohols, and PAHs. Increasing the pyrolysis pressure and temperature was found to drastically promote the generation of PAHs, accompanied by a decrease in phenolics, SAHCs, sugars, carbonyls, and SRAHCs. The ring growth via Diels-Alder cycloaddition reaction pathways in combination with hydrogen abstraction/C2H2 addition (HACA) was postulated to be the mechanism of the formation of PAHs. The 4-ring PAHs (pyrene, fluoranthene) and 3-ring PAHs (phenanthrene, fluorene) were found to dominate the lignin bio-oil, while the bio-oil from cellulose and xylan mainly contained 2-ring PAHs (naphthalene). Elevated pressures and temperatures were also found to significantly increase the selectivity of H-2 in the bio-gas.
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Reference:
Alcohol – Wikipedia,
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