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  Controlled lignosulfonate depolymerization via solvothermal fragmentation coupled with catalytic hydrogenolysis/hydrogenation in continuous flow reactor

Brandi, F., Antonietti, M., & Al-Naji, M. (2021). Controlled lignosulfonate depolymerization via solvothermal fragmentation coupled with catalytic hydrogenolysis/hydrogenation in continuous flow reactor. Green Chemistry, 23(24), 9894-9905. doi:10.1039/D1GC01714D.

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 Creators:
Brandi, Francesco1, Author           
Antonietti, Markus2, Author           
Al-Naji, Majd1, Author           
Affiliations:
1Majd Al-Naji, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3050472              
2Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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 Abstract: Sodium lignosulfonate (LS) was valorized to low molecular weight (Mw) fractions by combining solvothermal (SF) and catalytic hydrogenolysis/hydrogenation fragmentation (SHF) in continuous flow system. This achieved in either alcohol/water (EtOH2O or MeOH/H2O) as a solvent and Ni on nitrogen-doped carbon as a catalyst. The tunability according to temperature of both SF and catalytic SHF of LS has been separately investigated at 150°C, 200°C and 250°C. In SF, the minimal Mw was 2994 g mol-1 at 250°C with a dispersity (Đ) of 5.3 using MeOH/H2O. In catalytic SHF using MeOH/water, extremely low Mw was found (433 mg gLS-1) with Đ of 1.2 combined with 34 mg gLS-1. The monomer yield was improved to 42 mg gLS-1 using dual catalytic beds. These results is a direct evident that lignin is an unstable polymer at elevated temperature and could be efficiently deconstructed in hydrothermal conditions with and without catalyst.

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Language(s): eng - English
 Dates: 2021-09-102021
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/D1GC01714D
BibTex Citekey: D1GC01714D
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Title: Green Chemistry
  Other : Green Chem.
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 23 (24) Sequence Number: - Start / End Page: 9894 - 9905 Identifier: ISSN: 1463-9262