Effect of biomass components’ interaction on the pyrolysis reaction kinetics and small-molecule product release characteristics

摘要

? 2023 Elsevier B.V.The first step in uncovering pyrolysis interaction is to understand the pyrolysis reaction kinetics and small-molecule product release mechanisms of biomass components. Therefore, the cross-coupled thermal decomposition properties, gaseous product release characteristics, and functional group evolution of cellulose, hemicellulose, and lignin were investigated. The reaction activation energy is shown to be lower in co-pyrolysis, and there exist optimal mixing ratios where they favor each other's thermal breakdown. When the cellulose ratio was low, dehydration reactions, as well as the cyclization and condensation processes of open-chain hexoses and pentoses, were stimulated, but these processes were hindered when the cellulose level was high. Mixing with lignin aids in the opening of cellulose rings. However, at lower lignin levels, the dehydration, demethylation, decarboxylation, and decarbonylation processes were largely hindered, and these reactions were only stimulated at greater lignin content. The pyrolysis reaction kinetics, as well as product composition and distribution, may be altered by adjusting the composition ratio of biomass. This research helps to better understand the biomass pyrolysis interaction.