Abstract
Potassium salt is a nonnegligible inorganic element in biomass, and it has a significant impact on the thermal behavior of biomass. To understand the mechanism of potassium on cellulose pyrolysis in depth, the evolution of functional groups of char combined with the characteristics of volatiles from cellulose pyrolysis with K2CO3 between 150 and 600 °C was investigated using two-dimensional perturbation correlation infrared spectroscopy (2D-PCIS). It was found that the addition of K2CO3 changed the decomposition pathway of cellulose, and reduce the initial temperature of cellulose decomposition from 250 °C to 150 °C. And K2CO3 accelerated the deconstruction of hydrogen bonding, and rupture of C5-O, C-C, glycosidic bond of cellulose crystal structure to form light molecular liner aliphatic compounds and CO, CO2 at lower temperature (150–250 °C). At higher temperature (>250 °C), it accelerated the generation of phenol C-O of pyrolysis char and inhibited the generation of aliphatic ether.
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