In-situ and ex-situ catalytic upgrading of vapors from microwave-assisted pyrolysis of lignin

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Bioresource Technology, ISSN: 0960-8524, Vol: 247, Page: 851-858

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Liangliang Fan, Paul Chen, Nan Zhou, Shiyu Liu, Yaning Zhang, Yuhuan Liu, Yunpu Wang, Muhammad Mubashar Omar, Peng Peng, Min Addy, Yanling Cheng, Roger Ruan Show More Hide
Elsevier BV
Chemical Engineering, Environmental Science, Energy
article description
In-situ and ex-situ catalytic upgrading with HZSM-5 of vapors from microwave-assisted pyrolysis of lignin were studied. The in-situ process produced higher bio-oil and less char than ex-situ process. The gas yield was similar for both processes. The ex-situ process had higher selectivity to aromatics and produced more syngas and less CO 2 than the in-situ process. Additional experiments on ex-situ process found that the bio-oil yield and coke deposition decreased while the gas yield increased at higher catalyst-to-lignin ratios and catalytic upgrading temperatures. The increased catalyst-to-lignin ratio from 0 to 0.3 reduced the selectivity of methoxy phenols from 73.7% to 22.6% while increased that of aromatics from 1.1% to 41.4%. The highest selectivity of alkyl phenols (31.9%) was obtained at 0.2 of catalyst-to-lignin ratio. Higher catalytic temperatures favored greater conversion of methoxy phenols to alkyl phenols and aromatics. Appropriate catalyst-to-lignin ratio (0.3) together with higher catalytic temperatures favored syngas formation.

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