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Targeted Substituted-Phenol Production by Strategic Hydrogenolysis of Sugar-Cane Lignin

1
Centre for Catalysis Research, School of Chemistry, Joseph Black building, University of Glasgow, Glasgow G12 8QQ, UK
2
Centro de Ciencias Agrarias, Universidade Federal de Alagoas, Maceió 57072-900, Alagoas, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: George Z. Papageorgiou
Received: 23 April 2021 / Revised: 24 May 2021 / Accepted: 10 June 2021 / Published: 18 June 2021
In this work, a waste-derived lignin with abundant uncondensed linkages, using accessible solvents (acetone/water mixture) and low-cost catalysts showed successful depolymerization for the production of target molecules 4-ethylphenol, 4-propyl-2,6-dimethoxyphenol and 4-propyl-2-methoxyphenol. Lignin samples were obtained from sugar-cane bagasse residue by an organosolv process. Four alumina-based catalysts (Pt/Al2O3, Rh/Al2O3, Ni/Al2O3 and Fe/Al2O3) were used to depolymerize the sugar cane lignin (SCL) in an acetone/water mixture 50/50 v/v at 573 K and 20 barg hydrogen. This strategic depolymerisation-hydrogenolysis process resulted in the molecular weight of the SCL being reduced by half while the polydispersity also decreased. Catalysts significantly improved product yield compared to thermolysis. Specific metals directed product distribution and yield, Rh/Al2O3 gave the highest overall yield (13%), but Ni/Al2O3 showed the highest selectivity to a given product (~32% to 4-ethylphenol). Mechanistic routes were proposed either from lignin fragments or from the main polymer. Catalysts showed evidence of carbon laydown that was specific to the lignin rather than the catalyst. These results showed that control over selectivity could be achievable by appropriate combination of catalyst, lignin and solvent mixture. View Full-Text
Keywords: biomass valorization; lignin; hydrogenolysis; heterogenous catalysis biomass valorization; lignin; hydrogenolysis; heterogenous catalysis
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MDPI and ACS Style

de Albuquerque Fragoso, D.M.; Goulart, H.F.; Santana, A.E.G.; Jackson, S.D. Targeted Substituted-Phenol Production by Strategic Hydrogenolysis of Sugar-Cane Lignin. Biomass 2021, 1, 11-28. https://0-doi-org.brum.beds.ac.uk/10.3390/biomass1010002

AMA Style

de Albuquerque Fragoso DM, Goulart HF, Santana AEG, Jackson SD. Targeted Substituted-Phenol Production by Strategic Hydrogenolysis of Sugar-Cane Lignin. Biomass. 2021; 1(1):11-28. https://0-doi-org.brum.beds.ac.uk/10.3390/biomass1010002

Chicago/Turabian Style

de Albuquerque Fragoso, Danielle M., Henrique F. Goulart, Antonio E.G. Santana, and Samuel D. Jackson 2021. "Targeted Substituted-Phenol Production by Strategic Hydrogenolysis of Sugar-Cane Lignin" Biomass 1, no. 1: 11-28. https://0-doi-org.brum.beds.ac.uk/10.3390/biomass1010002

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