To
understanding the biomass pyrolysis process in depth, the pyrolysis
mechanism of cellulose was investigated based on the combination of
gas and liquid product releasing behavior with the structure evolution
of solid product at 200–600 °C. In particular, the transformation
process of the chemical functional group of solid char was explored
with two-dimensional perturbation correlation infrared spectroscopy
(2D-PCIS). It was found that at a lower temperature (<350 °C),
it was mainly the dehydration and keto alcohol isomerization of cellulose
and the char was mainly composed of aromatic and alicyclic compounds
rich in CO structures. With temperature increasing (350–450
°C), glycosidic bonds were rapidly broken, with volatiles increasing
greatly, and formed network structure containing low-order fused rings
(2–5 rings). At a higher temperature (450–600 °C),
the accelerated etherification of pyran rings resulted in a continuous
increase of LG and solid char went to higher-order fused rings (2
× 2–4 × 4 rings). These mechanistic insights are
helpful for the understanding of the biomass pyrolysis process.
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