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Research Papers: Fuel Combustion

Contrasting the Pyrolysis Behavior of Selected Biomass and the Effect of Lignin

[+] Author and Article Information
Zhezi Zhang

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley 6009, WA, Australia
e-mail: Zhezi.Zhang@uwa.edu.au

Mingming Zhu

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley 6009, WA, Australia
e-mail: Mingming.Zhu@uwa.edu.au

Philip Hobson

Sugar Research and Innovation,
Centre for Tropical Crops and Biocommodities,
Queensland University of Technology,
Brisbane 4001, Queensland, Australia
e-mail: P.Hobson@qut.edu.au

William Doherty

Sugar Research and Innovation,
Centre for Tropical Crops and Biocommodities,
Queensland University of Technology,
Brisbane 4001, Queensland, Australia
e-mail: W.Doherty@qut.edu.au

Dongke Zhang

Centre for Energy (M473),
The University of Western Australia,
35 Stirling Highway,
Crawley 6009, WA, Australia,
e-mail: Dongke.Zhang@uwa.edu.au

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 4, 2017; final manuscript received December 28, 2017; published online February 27, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 140(6), 062201 (Feb 27, 2018) (5 pages) Paper No: JERT-17-1406; doi: 10.1115/1.4039321 History: Received August 04, 2017; Revised December 28, 2017

This study was aimed at comparing the pyrolysis behavior of several selected biomass samples, namely, pine wood, poplar wood, wheat straw, and sugarcane bagasse, with a particular attention to the effect of lignin. Raw samples were first treated using Soxhlet solvent extraction with a 2:1 (v/v) mixture of toluene/ethanol to remove wax. Lignin was then removed by soaking the dewaxed samples in a 1.0 M sodium chlorite solution at 343 K till the solids became white. Fourier transform infrared (FTIR) spectroscopy analysis was applied to characterize the surface functional groups of the samples. The morphology of the samples before and after delignification treatment was analyzed using scanning electron microscope (SEM). The pyrolysis behavior of the raw and treated biomass samples was studied using a thermogravimetric analyzer (TGA) operating in nitrogen at a constant heating rate of 10 K min−1 from room temperature to the final temperature 823 K. The FTIR and SEM results indicated that lignin can be successfully removed from the raw biomass via the chemical treatment used. As expected, the pyrolysis behavior differed significantly among the various raw biomass samples. However, the pyrolysis behavior of the delignified samples showed almost identical thermal behavior although the temperature associated with the maximum rate of pyrolysis was shifted to a lower temperature regime by ca. 50 K. This suggests that the presence of lignin significantly affected the biomass pyrolysis behavior. Thus, the pyrolysis behavior of the biomass cannot be predicted simply from the individual components without considering their interactions.

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Figures

Grahic Jump Location
Fig. 1

FTIR spectrum of (a) raw, (b) dewaxed, and (c) delignified pine wood

Grahic Jump Location
Fig. 2

SEM images of (a) raw, (b) dewaxed, and (c) delignified pine wood

Grahic Jump Location
Fig. 3

Differential thermogravimetric (DTG) curves of pyrolysis of raw, dewaxed and delignified (a) pine, (b) poplar, (c) wheat straw, and (d) bagasse at 10 K min−1 to final temperature of 823 K

Grahic Jump Location
Fig. 4

DTG curves of pyrolysis of delignified pine, poplar, wheat straw, and bagasse at 10 K min−1 to final temperature of 823 K

Grahic Jump Location
Fig. 5

Hierarchical structure of biomass

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