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Thermo-physical, Chemical and Structural Modifications in Torrefied Biomass Residues

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Abstract

The study examined the modifications in the thermo-physical and chemical structure of Tectona grandis (TK) and Sorghum bicolour stalk residues that occurred during the process of torrefaction. The analytical techniques used are Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) alongside some basic data characterisation techniques. Data from specific FTIR spectra were used quantitatively in the evaluation of total crystalline and lateral order indices (TCI and LOI) for cellulose and syringyl to guaiacyl (S/G) ratio in lignin. The indices and the ratio were applied in monitoring modifications in cellulose crystallinity and lignin structure. The S/G ratio for untreated TK dropped significantly from 0.6 to 0.12 after torrefaction. An appreciable rise in the TCI and LOI was observed for both samples following the thermochemical conversion process. A distinct thermal decomposition pathway, which widen in discrepancy with increasing torrefaction temperature, was established between untreated and torrefied biomass residues via the TGA. The basic data analysis demonstrated a significant rise in the calorific value of torrefied biomass; approximately from an average of 19.1–26.8 MJ/kg.

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Acknowledgements

We acknowledge the financial support from the Lower Niger River Basin Development Authority sponsorship program. The FTIR spectrometer was supported by USDA-CSREES-NRI Grant Number 2005-35103-15243.

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Authors and Affiliations

  1. Department of Mechanical, Automotive and Production Engineering, Faculty of Engineering, Elizade University, Ilara-Mokin, Ondo State, Nigeria

    Ayokunle O. Balogun

  2. Department of Mechanical Engineering, Faculty of Engineering and Technology, University of Ilorin, Ilorin, Nigeria

    Olumuyiwa A. Lasode

  3. Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID, 83844-1132, USA

    Armando G. McDonald

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  1. Ayokunle O. Balogun
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  3. Armando G. McDonald
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Correspondence to Ayokunle O. Balogun.

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Balogun, A.O., Lasode, O.A. & McDonald, A.G. Thermo-physical, Chemical and Structural Modifications in Torrefied Biomass Residues. Waste Biomass Valor 9, 131–138 (2018). https://doi.org/10.1007/s12649-016-9787-7

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