Supercritical methanol depolymerization and hydrodeoxygenation of pyrolytic lignin over reduced copper porous metal oxides

Supercritical methanol depolymerization and hydrodeoxygenation (SCM-DHDO) is a process to produce fuel from biomass with supercritical methanol and CuMgAlO x catalyst. Previous research has shown that SCM-DHDO can convert cellulose, lignin and whole biomass feedstock in a single reaction step. In th...

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Bibliographic Details
Published in:Green chemistry : an international journal and green chemistry resource : GC 2020-12, Vol.22 (23), p.843-8413
Main Authors: Li, Jian, Galebach, Peter H, Johnson, Jillian K, Fredriksen, Tom, Wittrig, Ashley, Bai, Xiaowei, Yang, Haiping, Huber, George W
Format: Article
Language:English
Subjects:
Aldehydes
Biomass
Carbon
Catalysts
Cellulose
Depolymerization
Dimers
Green chemistry
Ketones
Lignin
Metal oxides
Methanol
Molecular weight
Monomers
Oil
Pyrolysis
Reaction time
Supercritical fluids
Thermal instability
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Summary:Supercritical methanol depolymerization and hydrodeoxygenation (SCM-DHDO) is a process to produce fuel from biomass with supercritical methanol and CuMgAlO x catalyst. Previous research has shown that SCM-DHDO can convert cellulose, lignin and whole biomass feedstock in a single reaction step. In this paper, we show that SCM-DHDO can convert pyrolytic lignin derived from pyrolysis oil at approximately 50% carbon yield to an upgraded oil product. The upgraded oil mainly contains lignin monomers and dimers while an additional 50% of the carbon was converted into undesired products including methanol, insoluble pyrolytic lignin and coke. We demonstrated that after a 4 h SCM-DHDO reaction the pyrolytic lignin molecular weight did not significantly change, but the ketones, acids and aldehydes in the pyrolytic lignin were completely converted. Increasing the reaction time of SCM-DHDO reaction from 2 to 10 h increased the lignin monomer and dimer yield. The reduced CuAlMgO x catalyst hydrogenated 57.4% of the aromatic carbons to aliphatic carbons and removed 64% of the oxygen. However, the product oil could still not be distilled because of the thermal instability of the upgraded pyrolytic lignin. Supercritical methanol depolymerization and hydrodeoxygenation (SCM-DHDO) is a process to produce fuel from biomass with supercritical methanol and CuMgAlO x catalyst.
ISSN:1463-9262
1463-9270
DOI:10.1039/d0gc02355h