Biomimetic Vanadate and Molybdate Systems for Oxidative Upgrading of Iono- and Organosolv Hard- and Softwood Lignins
by
Lucía Penín 1, Matteo Gigli 2,3,†
, Federica Sabuzi 4,*, Valentín Santos 1, Pierluca Galloni 4, Valeria Conte 4, Juan Carlos Parajó 1, Heiko Lange 3,5,*,† and Claudia Crestini 2,3,*,†
Lucía Penín 1, Matteo Gigli 2,3,†, Federica Sabuzi 4,*, Valentín Santos 1, Pierluca Galloni 4, Valeria Conte 4, Juan Carlos Parajó 1, Heiko Lange 3,5,*,† and Claudia Crestini 2,3,*,†
1
Chemical Engineering Department, Polytechnical Building, University of Vigo (Campus Ourense), As Lagoas, 32004 Ourense, Spain
2
Department of Molecular Science and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30170 Venice Mestre, Italy
3
CSGI—Center for Colloid and Surface Science, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
4
Department of Chemical Science and Technologies, University of Rome ‘Tor Vergata’, Via della Ricerca Scientifica, 00133 Rome, Italy
5
Department of Pharmacy, University of Naples ‘Federico II’, Via Domenico Montesano 49, 80131 Naples, Italy
*
Authors to whom correspondence should be addressed.
†
Affiliated with (4) via NAST—Nanoscience & Nanotechnology & Innovative Instrumentation Center.
Processes 2020, 8(9), 1161; https://doi.org/10.3390/pr8091161
Received: 25 August 2020 / Revised: 11 September 2020 / Accepted: 13 September 2020 / Published: 16 September 2020
(This article belongs to the Special Issue Biochemical and Thermochemical Conversion Processes of Lignicellulosic Biomass Fractionated Streams)
Recently reported acetosolv soft- and hardwood lignins as well as ionosolv soft- and hardwood lignins were transformed into monomeric aromatic compounds using either a vanadate or a molybdate-based catalyst system. Monomers were generated with remarkable, catalyst-dependent selectivity and high depolymerisation yields via oxidative exo- and endo-depolymerisation processes. Using the vanadate–hydrogen peroxide system on acetosolv pine lignin, vanillin and isovanillin were produced as main products with depolymerisation yields of 31%. Using the molybdate system on acetosolv and ionosolv lignin, vanillic acid was the practically exclusive product, with depolymerisation yields of up to 72%. Similar selectivities, albeit with lower depolymerisation yields of around 50% under standardised conditions, were obtained for eucalyptus acetosolv lignin, producing vanillin and syringaldehyde or vanillic acid as products, by using the vanadate- or the molybdate-based systems respectively.
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Keywords:
oxidative lignin upgrade; catalytic lignin oxidation; vanadate; molybdate; organosolv; ionosolv; lignin; biomimetic
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
MDPI and ACS Style
Penín, L.; Gigli, M.; Sabuzi, F.; Santos, V.; Galloni, P.; Conte, V.; Parajó, J.C.; Lange, H.; Crestini, C. Biomimetic Vanadate and Molybdate Systems for Oxidative Upgrading of Iono- and Organosolv Hard- and Softwood Lignins. Processes 2020, 8, 1161.
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