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Kraft Lignin Electro-Oxidation under Ambient Temperature and Pressure

Author

Listed:
  • Jiashuai Han

    (Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada)

  • Roger Lin

    (Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada)

  • Mahdi Salehi

    (Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada)

  • Amirhossein Farzi

    (Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada)

  • Andrew Carkner

    (Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada)

  • Kefang Liu

    (Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada)

  • Omar Abou El-Oon

    (Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada)

  • Olumoye Ajao

    (Natural Resources Canada, Fuels Sector, Analysis and Operations Branch, Ottawa, ON K1A 0E4, Canada)

  • Ali Seifitokaldani

    (Department of Chemical Engineering, McGill University, Montréal, QC H3A 0C5, Canada)

Abstract

Lignin is the largest natural source of aromatic chemicals. Due to its complex polymeric structure, Kraft lignin is under-utilized and usually combusted for heat generation, thus resulting in CO 2 emissions in the Kraft process. To valorize lignin with renewable electricity and to convert it into value-added aromatic chemicals, efficient electrochemical methods need to be discovered, based not only on its apparent yield of building block chemicals but also on its energy efficiency. In this study, the electro-oxidative performance of six different metals was systematically evaluated. The results showed that the synthesized Ni-based catalyst can increase the vanillin and vanillic acid apparent yield by 50–60% compared to when Ni-based catalyst is absent. We also found that the oxygen evolution reaction (OER) is more than a competing reaction since the presence of oxygen synergistically aids oxidation of the lignin to increase aromatic chemical production by 63% compared to the sum of vanillin generation from both voltage-only and oxygen-only scenarios. With the novel proposed notion of charge efficiency, we showed that utilizing a thinner layer of Ni catalyst balances the OER and the oxidative reaction of lignin, thus improving the charge efficiency for vanillin by 22%

Suggested Citation

  • Jiashuai Han & Roger Lin & Mahdi Salehi & Amirhossein Farzi & Andrew Carkner & Kefang Liu & Omar Abou El-Oon & Olumoye Ajao & Ali Seifitokaldani, 2023. "Kraft Lignin Electro-Oxidation under Ambient Temperature and Pressure," Energies, MDPI, vol. 16(24), pages 1-15, December.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:24:p:8007-:d:1297922
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    References listed on IDEAS

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    1. Pettersson, Karin & Harvey, Simon, 2010. "CO2 emission balances for different black liquor gasification biorefinery concepts for production of electricity or second-generation liquid biofuels," Energy, Elsevier, vol. 35(2), pages 1101-1106.
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