Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/105821
Title: Production of Aromatic Compounds by Catalytic Depolymerization of Technical and Downstream Biorefinery Lignins
Authors: Cornejo, Alfonso
Bimbela, Fernando
Moreira, Rui 
Hablich, Karina
García-Yoldi, Íñigo
Maisterra, Maitane
Portugal, António 
Gandía, Luis M.
Martínez-Merino, Víctor
Keywords: lignin; depolymerization; homogeneous and heterogeneous catalysis; bio-based aromatic compounds
Issue Date: 18-Sep-2020
Publisher: MDPI
Project: UNED-Fundación La Caixa (Prj. Ref. “LCF/ PR/PR15/51100007”) 
Economy Development Departament, Navarre Government (under Project “PC036-037 Biovalorización”) 
POCI-01-0145-FEDER-016403 
Banco de Santander and Universidad Pública de Navarra under the “Programa de Intensificación de la Investigación 2018” initiative 
Erasmus+ Programme of the European Union to conduct a 3-month research sojourn at UPNA laboratories (mobility aid ref. OUT_2018_1700) 
Serial title, monograph or event: Biomolecules
Volume: 10
Issue: 9
Abstract: Lignocellulosic materials are promising alternatives to non-renewable fossil sources when producing aromatic compounds. Lignins from Populus salicaceae. Pinus radiata and Pinus pinaster from industrial wastes and biorefinery effluents were isolated and characterized. Lignin was depolymerized using homogenous (NaOH) and heterogeneous (Ni-, Cu- or Ni-Cu-hydrotalcites) base catalysis and catalytic hydrogenolysis using Ru/C. When homogeneous base catalyzed depolymerization (BCD) and Ru/C hydrogenolysis were combined on poplar lignin, the aromatics amount was ca. 11 wt.%. Monomer distributions changed depending on the feedstock and the reaction conditions. Aqueous NaOH produced cleavage of the alkyl side chain that was preserved when using modified hydrotalcite catalysts or Ru/C-catalyzed hydrogenolysis in ethanol. Depolymerization using hydrotalcite catalysts in ethanol produced monomers bearing carbonyl groups on the alkyl side chain. The analysis of the reaction mixtures was done by size exclusion chromatography (SEC) and diffusion ordered nuclear magnetic resonance spectroscopy (DOSY NMR). 31P NMR and heteronuclear single quantum coherence spectroscopy (HSQC) were also used in this study. The content in poly-(hydroxy)-aromatic ethers in the reaction mixtures decreased upon thermal treatments in ethanol. It was concluded that thermo-solvolysis is key in lignin depolymerization, and that the synergistic effect of Ni and Cu provided monomers with oxidized alkyl side chains.
URI: https://hdl.handle.net/10316/105821
ISSN: 2218-273X
DOI: 10.3390/biom10091338
Rights: openAccess
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais

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