Chemical and structural characterization of char development during lignocellulosic biomass pyrolysis

Lihle D. Mafu, Hein W.J.P. Neomagus*, Raymond C. Everson, Christien A. Strydom, Marion Carrier, Gregory N. Okolo, John R. Bunt

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The chemical and structural changes of three lignocellulosic biomass samples during pyrolysis were investigated using both conventional and advanced characterization techniques. The use of ATR-FTIR as a characterization tool is extended by the proposal of a method to determine aromaticity, the calculation of both CH2/CH3 ratio and the degree of aromatic ring condensation ((R/C)u). With increasing temperature, the H/C and O/C ratios, XA and CH2/CH3 ratio decreased, while (R/C)u and aromaticity increased. The micropore network developed with increasing temperature, until the coalescence of pores at 1100 °C, which can be linked to increasing carbon densification, extent of aromatization and/or graphitization of the biomass chars. WAXRD-CFA measurements indicated the gradual formation of nearly parallel basic structural units with increasing carbonization temperature. The char development can be considered to occur in two steps: elimination of aliphatic compounds at low temperatures, and hydrogen abstraction and aromatic ring condensation at high temperatures.
Original languageEnglish
Pages (from-to)941-948
Number of pages8
JournalBioresource Technology
Volume243
Early online date6 Jul 2017
DOIs
Publication statusPublished - Nov 2017

Fingerprint

pyrolysis
condensation
Biomass
Pyrolysis
biomass
Condensation
graphitization
temperature
coalescence
structural change
Temperature
Aromatization
Graphitization
hydrogen
Carbonization
Coalescence
Densification
carbon
Hydrogen
Carbon

Bibliographical note

© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • aromaticity
  • ATR-FTIR
  • biochar
  • CPMAS 13C NMR
  • pyrolysis

Cite this

Mafu, L. D., Neomagus, H. W. J. P., Everson, R. C., Strydom, C. A., Carrier, M., Okolo, G. N., & Bunt, J. R. (2017). Chemical and structural characterization of char development during lignocellulosic biomass pyrolysis. Bioresource Technology, 243, 941-948. https://doi.org/10.1016/j.biortech.2017.07.017
Mafu, Lihle D. ; Neomagus, Hein W.J.P. ; Everson, Raymond C. ; Strydom, Christien A. ; Carrier, Marion ; Okolo, Gregory N. ; Bunt, John R. / Chemical and structural characterization of char development during lignocellulosic biomass pyrolysis. In: Bioresource Technology. 2017 ; Vol. 243. pp. 941-948.
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Mafu, LD, Neomagus, HWJP, Everson, RC, Strydom, CA, Carrier, M, Okolo, GN & Bunt, JR 2017, 'Chemical and structural characterization of char development during lignocellulosic biomass pyrolysis', Bioresource Technology, vol. 243, pp. 941-948. https://doi.org/10.1016/j.biortech.2017.07.017

Chemical and structural characterization of char development during lignocellulosic biomass pyrolysis. / Mafu, Lihle D.; Neomagus, Hein W.J.P.; Everson, Raymond C.; Strydom, Christien A.; Carrier, Marion; Okolo, Gregory N.; Bunt, John R.

In: Bioresource Technology, Vol. 243, 11.2017, p. 941-948.

Research output: Contribution to journalArticle

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AU - Carrier, Marion

AU - Okolo, Gregory N.

AU - Bunt, John R.

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