Sammendrag
Infrared and 13C solid state nuclear magnetic resonance spectroscopies and benzene polycarboxylic acids (BPCA)
analysis were used to characterize the structural changes occurring during slow pyrolysis of corncob and
Miscanthus at different temperatures from 235 °C to 800 °C. In the case of corncob, a char sample obtained from
flash carbonization was also investigated. Spectroscopic techniques gave detailed information on the transformations
of the different biomass components, whereas BPCA analysis allowed the amount of aromatic structures
present in the different chars and the degree of aromatic condensation to be determined. The results showed that
above 500 °C both corncob and Miscanthus give polyaromatic solid residues with similar degree of aromatic
condensation but with differences in the structure. On the other hand, at lower temperatures, char composition
was observed to depend on the different cellulose/hemicellulose/lignin ratios in the feedstocks. Flash carbonization
was found to mainly affect the degree of aromatic condensation.
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