Abstract
This research focuses on the chemical transformation of a solid biofuel, biocoke, produced under subcritical water. The authors aim to study via attenuated total reflectance infrared spectroscopy (ATR-FTIR) the effect of additional lignocellulose (cellulose, hemicellulose, and lignin) substances on the structural reaction and the biocoke compressive strength for industrial quality control purposes. Principal component regression is used to analyze the structural alterations between mixtures, materials, and biocoke samples and then determine the correlation between these changes and the biocoke’s maximum compressive strength. The results show a relationship between changes in the 1800–1500 and 800–400 cm−1 regions of FTIR and the maximum compressive strength of the biocoke. Lignin cleavage caused changes in the 1800–1500 cm−1 region. The greater the lignin concentration, the more clearly a reaction was detected. Alteration in the 800–400 cm−1 region resulted from higher cellulose content in the biocoke, which decreased the biocoke’s maximum compressive strength. The hemicellulose content did not show any correlation with the structural changes in this study setup.
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