Defence Yanfei Li: "Biobased chemicals from a reed based biorefinery"

Promotors: 1^st promotor: Prof Gert-Jan Euverink, 2^nd promotor: Prof Erik Heeres

Abstract: This thesis presents a green and integrated biorefinery approach for the efficient conversion of reed (Phragmites australis) using formic acid. A rapid flow-through fractionation process with aqueous formic acid was developed to separate reed into cellulose-rich pulp, hemicellulose-derived sugars, and high-purity lignin. The hemicellulose-rich hydrolysate was directly converted to furfural with high yield (up to 93.5%) in biphasic and intensified systems, benefiting from catalytic effects of native ions. Lignin was depolymerized into phenolic monomers via reductive catalytic processes using either H₂ or formic acid, with comparable product yields, supporting the use of formic acid as a safer hydrogen source. Additionally, this work reviews the catalytic roles and carbon-neutral potential of formic acid in biomass processing. Overall, the research demonstrates a promising green pathway to valorize underutilized biomass and contributes to the development of sustainable, carbon-efficient biorefineries.

Dissertation