Fig. 5From: A review on lignin pyrolysis: pyrolytic behavior, mechanism, and relevant upgrading for improving process efficiencyProposed reaction pathways for primary stage of lignin pyrolysis (P1: depolymerization and dehydration; P2: side-chain scission and demethylation; P3, P4: depolymerization; P5: demethoxylation; P6: side-chain scission and demethoxylation; P7: fragmentation of lignin side chains; P8: dehydration and fragmentation of carbohydrate) [39]Back to article page