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Open AccessFeature PaperArticle

Biomimetic Vanadate and Molybdate Systems for Oxidative Upgrading of Iono- and Organosolv Hard- and Softwood Lignins

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
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. View Full-Text
Keywords: oxidative lignin upgrade; catalytic lignin oxidation; vanadate; molybdate; organosolv; ionosolv; lignin; biomimetic oxidative lignin upgrade; catalytic lignin oxidation; vanadate; molybdate; organosolv; ionosolv; lignin; biomimetic
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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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