Abstract
The effects of methanol on upgrading of volatiles generated from Hami lignite pyrolysis for producing light aromatics were conducted. The yields of light aromatics were increased by applying methanol as mild hydrogen donor. Particularly, the formation of polymethylbenzene and methylphenols were greatly increased than that of coal pyrolysis under nitrogen atmosphere, suggesting that methanol also provided CH3 and OH. The proportion of deuterium in aliphatic chains were dominate under CH3OD atmosphere, indicating that methanol participated in upgrading of coal pyrolysis volatiles via the decomposition. Moreover, methanol was more inclined to supply H to branched chains of aromatic rings over ZSM-5 zeolite while providing OH without catalysts. However, excessive methanol addition contrarily brought a decrease of light aromatic yields. Unexpectedly, methanol promoted coke formation probably due to the production of polymethylbenzenes and polycyclic aromatics.
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