Autor(es)

Brix, Ann Cathrin ; Orzari, Luiz Otavio ; Krysiak, Olga A. ; Cechanaviciute, Ieva A. ; Banko, Lars ; Ludwig, Alfred ; Janegitz, Bruno Campos ; Schuhmann, Wolfgang

• Tipo de documento: Artigo Científico
• Fonte: CHEMELECTROCHEM; v. 11, n. 10, p. 10-pg., 2024-03-20.

Resumo

The electrification of the production of fine chemicals has received increased interest in combating petrochemical routes with a high carbon footprint. Oxidising biomass from waste streams with concomitant hydrogen production, such as the transformation of lignin to vanillin, would be a great asset. Here, we show the combination of activity screening using a scanning droplet cell on a thin-film Ni-Fe library and performance testing in a flow-through cell with pulse electrolysis. The identified optimal Ni-Fe material composition was prepared on Ni foam with a polymer/metal precursor spray method. Full factorial and Doehlert matrix designs were employed to better comprehend each parameter's effects on the complex system. The best conditions for the electrooxidation of Kraft lignin at room temperature were at E1st=1.36 V vs RHE, t1st=1 s for the first pulse and E2nd=1.60 V vs RHE and t2nd=15 s for the second pulse, leading to the significantly improved production of 2.15 mu mols of vanillin at room temperature. Pulsed chronopotentiometry was demonstrated to be a cost-effective and robust technique with a simple setup for the valorisation of Kraft lignin. Combined with a subsequent thermolysis step, 8.05 mu mols of vanillin were obtained. Biomass valorisation during water electrolysis may serve as an alternative anode reaction for green H2 production. For lignin oxidation to vanillin, a Ni-Fe catalyst composition selected with the help of scanning droplet cell screening was employed to investigate and optimise the pulse electrolysis parameters to mitigate vanillin overoxidation. In conjunction with thermolysis, significant improvement of the produced amount of vanillin from lignin was achieved.+ image (AU)

• Processo FAPESP: 19/23342-0 - Desenvolvimento de novas arquiteturas de imunossensores para a detecção de biomarcadores das Doenças de Huntington e Parkinson
• Beneficiário: Luiz Otávio Orzari
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto