Selective conversion of lignocellulosic biomass and its components into value-added furans over Al-based bimetals: Analytical Py-GC × GC/MS
2022
Lu, Yi | Zheng, Yunwu | He, Rui | Zheng, Zhifeng
Furans is a versatile chemical family, developing environmental-friendly methods to prepare furans and enhance the selectivity of high-value furans are of great significance. In present study, bio-based activated carbon supported Al-containing bimetals were devised to serve as solid acid catalysts for selective transformation lignocellulosic biomass and its components into valuable furans. Among the bimetallic catalysts, 2Al-4Zr/AC increased both the content of furans and the selectivity of 5-methylfurfural (5-MFF) , and the highest peak area% of furans and selectivity of 5-MFFwere 88.6% and 44.5%, which were derived from the catalytic pyrolysis of glucose, and the counterparts from the catalytic pyrolysis of pine wood were 56.3% and 30.7%, respectively. In addition to 5-MFF, 2-methylfuran (2-MF), furfural (FF) and 2,5-dimethylfuran (DMF) were also included into major furans. In the catalytic pyrolysis process of lignocellulosic biomass, C6-based sugars were conducive to the production of 5-MFF, and C5-based sugars favored the formation of 2-MF and FF. Characterization with NH₃-TPD, Pyridine-IR, N₂ adsorption-desorption, XRD and XPS indicated that 2Al-4Zr/AC, with mild Lewis acidity and combined Brønsted acid sites, high surface area and micro-mesoporous structure, promoted both the dehydration of saccharides and the dehydrogenation of cyclopentanones to increase the content of furans. In the catalyst, the synergistic effect between Al species (including Al₂O₃, AlO(OH) and Al(OH)₃) and Zr species (mainly ZrO₂) played an important role in its catalytic activity, and Al species were the major contributor to its activity.
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