Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 161, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2021.105369
Keywords
Hemicellulose; Slow pyrolysis; Xylan; NMR GC-MS analysis; Pyrolysis products distribution
Funding
- RIZOBIOREM Call: Progetti Di Ricerca Di Rilevante Interesse Nazionale (PRIN) Bando 2017 Italian Ministry of Education, University and Research (MIUR) Grant [2017BHH84R]
- Fundacao para a Ciencia e a Tecnologia (FCT) [PTDC/EME-EME/30300/2017, UIDB/50022/2020, SFRH/BD/129693/2017]
- European Regional Development Fund under the ROP of the Lombardy Region ERDF 2014-2020, Axis I Strengthen technological research, development and innovation-Action 1.b.1.3 Support for co-operative RD activities to develop new sustainable technologies,
- Fundação para a Ciência e a Tecnologia [PTDC/EME-EME/30300/2017, SFRH/BD/129693/2017] Funding Source: FCT
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This study investigates the impact of structural features of xylose-based hemicelluloses on pyrolysis products distribution, finding that the chain branching degree has a greater effect on the pyrolytic behavior of xylose-based hemicelluloses, while the liquid composition of different hemicelluloses shows some variations.
This work provides insights into the relationship between the pyrolysis products distribution and the structural features of xylose-based hemicelluloses. Three xylose-based hemicelluloses differing in composition, molecular weight, chain branching and origin were selected, structurally characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis and nuclear magnetic resonance and then used as feedstocks for slow pyrolysis tests up to 700 degrees C in nitrogen environment. Commercial beechwood xylan was selected as representative of the glucuronoxylan hemicellulose type, typical of hardwood species. Commercial corncob xylan was selected as it is composed by a mixture of low molecular weight xylo-oligosaccharides with a low acetylation degree. In the end, the xylan extracted from grape pruning, being an arabinoglucuronoxylan, was chosen as representative of hemicellulose structure common to most annual plants and agricultural wastes. Low-branched material (corncob xylan) produced the lowest yield of char and the highest yield of pyrolysis liquids, while highly-branched material (grape pruning xylan) exhibited an opposite trend. The liquid composition was qualitatively similar for all the considered xylans. However, the comparison of the quantifiable species showed different relative abundances. The pyrolysis products distribution indicated that the chain branching degree affected at a higher extent the feedstock pyrolytic behavior with respect to the ash content.
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