Lab and pilot-scale continuous reductive depolymerization of lignin: Process optimization through catalyst choice and regeneration

Lignin, a unique renewable aromatic compound class, has significant potential as a sustainable resource but is mainly incinerated due to its complex valorization. In this regard, valorization of lignin through reductive depolymerization in a continuous-flow reactor seems promising, as it generates a continuous output of aromatic monomers, oligomers, and low molar mass polymers which are better suitable for material applications.[1] While the continuous reductive depolymerization of lignin holds significant potential, catalyst deactivation prevents achieving long processing times which are necessary to become industrially relevant.[2] At VITO, we aim to understand the different catalyst deactivation mechanisms to allow scaling up the production of depolymerized lignin oil up to pilot-scale and to increase catalyst use through sustainable recycling methods.[3]