Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 3, Pages 3010-3018Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b02721
Keywords
Lignin; Catalyst; Depolymerization; Zeolites; Phenolic monomers; MIBK solvent
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Funding
- Joint Graduate School of Energy and Environment (JGSEE)
- Petchra Pra Jom Klao Doctoral Scholarship
- King Mongkut's University of Technology Thonburi (KMUTT)
- Thailand Research Fund [RTA5980006]
- Queensland University of Technology (QUT), Australia
- FEDER funds [AGL2014-53730-R, CTQ2014-60764-JIN]
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Catalytic depolymerization of organosolv lignin to phenolic monomers with zeolites was investigated under various operating conditions. H-USY (Si/Al molar ratio = 5) outperformed H-USY with Si/Al ratios of 50 and 250, H-BEA, H-ZSM5, and fumed SiO2 to produce the highest phenolic monomer yield from a commercial organosolv lignin in methanol at 300 degrees C for 1 h. It was then further investigated in the presence of acetone, ethyl acetate, methanol, and methyl isobutyl ketone (MIBK) on the depolymerization of organosolv bagasse lignin (BGL). The total highest phenolic monomer yield of 10.6 wt % was achieved with MIBK at 350 degrees C for 1 h with a catalyst loading of 10 wt %. A final total phenolic monomer yield of 19.4 wt % was obtained with an initial H-2 pressure of 2 MPa under similar processing conditions. The main phenolic monomers obtained are guaiacol (7.9 wt %), 4-ethylphenol (6.0 wt %), and phenol (3.4 wt %). The solvent properties were used to account for the differences in phenolic monomer yields obtained with different organic solvents.
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