In-situ catalytic upgrading of bio-oil derived from fast pyrolysis of lignin over high aluminum zeolites

- In-situ catalytic upgrading of bio-oil over high aluminum zeolite was investigated.
- H-ZSM-5 zeolite had high productivity towards aromatic hydrocarbons.
- H-beta zeolite had high selectivity to monoaromatic hydrocarbons.
- Pore channel structure in zeolite had great effect on the product distribution.

Bio-oil derived from the fast pyrolysis of lignin contains a range of chemicals including a lot of oxygenated chemical components which should be selectively upgraded to improve the oil quality. In this study, in-situ catalytic upgrading of bio-oil during the fast pyrolysis of lignin over five types of high aluminum zeolites, i.e., H-Ferrierite, H-Mordenite, H-ZSM-5, H-Beta and H-USY zeolites, were performed. It is found that the channel structure, pore sizes and acidity of zeolite had great effect on the product distribution, coke formation, and deoxygenation. The highest yield of light oil was obtained by using H-ZSM-5 zeolite and the highest selectivity towards monoaromatic hydrocarbons was achieved by H-Beta zeolite. This study could provide a guidance for the selection of suitable zeolite for the in-situ catalytic deoxygenation of bio-oil derived from fast pyrolysis of lignin.

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