Journal
NEW JOURNAL OF CHEMISTRY
Volume 46, Issue 9, Pages 4167-4178Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nj04777a
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Funding
- key research and development program of Xuzhou [KC21127]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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This study proposes an efficient method for lignin depolymerization using magnetic silica supported Bronsted acidic ionic liquid, resulting in high conversion of lignin and yield of aromatic monomers. The prepared catalyst exhibits high catalytic activity and easy separation, allowing for high performance and reusability.
Lignin, the most abundant renewable resource of aromatics in nature, is recognized as an alternative for fossil-based fuels and chemicals. Herein, we propose an efficient method to obtain aromatic monomers by lignin depolymerization using magnetic silica supported Bronsted acidic ionic liquid (BAIL-Fe3O4@SiO2), which has higher catalytic activity and easier separate property compared with the traditional lignin depolymerization in ionic liquids. The prepared BAIL (30 wt%)-Fe3O4@SiO2 catalyst is magnetic, mesoporous, thermostable, and core-shell structured, with a diameter of 500-600 nm, BET surface area of 185.7 m(2) g(-1), and pore size of 4.362 nm. The results showed that in the presence of 40 wt% of BAIL (30 wt%)-Fe3O4@SiO2 at 160 degrees C for 3 h, the conversion of lignin increased markedly to 54.0% and 33.0% yield of aromatic monomers were acquired. Among the ethanol-soluble liquid products from lignin depolymerization over BAIL (30 wt%)-Fe3O4@SiO2, the aryl aldehyde is predominant and has a yield of 19.2%. Furthermore, other products were also detected, for which the molecular mass was less than 250 Da, the double bond equivalent value varied from 4 to 7, and the carbon number was within the range of 6-15. The reusability experiment showed that the conversion of lignin and the yield of aromatic monomers can still achieve 90.4% and 91.2% of that catalyzed by fresh catalyst after the 3rd cycle.
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