Simulating the pyrolysis interactions among hemicellulose, cellulose and lignin in wood waste under real conditions to find the proper way to prepare bio-oil

The distribution of cellulose, hemicellulose, and lignin in the biomass structure was uneven. To explore the interactions of three components under real conditions during pyrolysis and find the proper way to prepare bio-oil, chemical methods were used to remove them in poplar wood and the remainders were pyrolyzed separately. The coke produced by hemicellulose pyrolysis inhibited the pyrolysis of lignin and cellulose, while the promoting synergistic effects between cellulose and lignin reduced the pyrolysis temperature (up to 23.2 °C) and activation energy (up to 15.07%). The content of light oil in the pyrolysis oil was higher and more conducive to combustion. XPS analysis showed that during the pyrolysis of lignin and cellulose, oxygen atoms were effectively fixed into the biochar and more benzene ring substances were in the bio-oil, thereby improving the quality of the pyrolysis oil. Finally, the most suitable artificial neural network (ANN) model was selected, and the pyrolysis behavior of the remaining substances after the removal of hemicellulose was studied in depth. It also showed that removing part of hemicellulose was more beneficial to the preparation of high-quality bio-oil.