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A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks
Pyrolysis of raw pine bark, pine, and Douglas-Fir bark was examined. The pyrolysis oil yields of raw pine bark, pine, and Douglas-Fir bark at 500 °C were 29.18%, 26.67%, and 26.65%, respectively. Both energy densification ratios (1.32–1.56) and energy yields (48.40–54.31%) of char are higher than py...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6780934/ https://www.ncbi.nlm.nih.gov/pubmed/31450759 http://dx.doi.org/10.3390/polym11091387 |
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author | Ben, Haoxi Wu, Fengze Wu, Zhihong Han, Guangting Jiang, Wei Ragauskas, Arthur J. |
author_facet | Ben, Haoxi Wu, Fengze Wu, Zhihong Han, Guangting Jiang, Wei Ragauskas, Arthur J. |
author_sort | Ben, Haoxi |
collection | PubMed |
description | Pyrolysis of raw pine bark, pine, and Douglas-Fir bark was examined. The pyrolysis oil yields of raw pine bark, pine, and Douglas-Fir bark at 500 °C were 29.18%, 26.67%, and 26.65%, respectively. Both energy densification ratios (1.32–1.56) and energy yields (48.40–54.31%) of char are higher than pyrolysis oils (energy densification ratios: 1.13–1.19, energy yields: 30.16–34.42%). The pyrolysis oils have higher heating values (~25 MJ/kg) than bio-oils (~20 MJ/kg) from wood and agricultural residues, and the higher heating values of char (~31 MJ/kg) are comparable to that of many commercial coals. The elemental analysis indicated that the lower O/C value and higher H/C value represent a more valuable source of energy for pyrolysis oils than biomass. The nuclear magnetic resonance results demonstrated that the most abundant hydroxyl groups of pyrolysis oil are aliphatic OH groups, catechol, guaiacol, and p-hydroxy-phenyl OH groups. The aliphatic OH groups are mainly derived from the cleavage of cellulose glycosidic bonds, while the catechol, guaiacol, and p-hydroxy-phenyl OH groups are mostly attributed to the cleavage of the lignin β–O-4 bond. Significant amount of aromatic carbon (~40%) in pyrolysis oils is obtained from tannin and lignin components and the aromatic C–O bonds may be formed by a radical reaction between the aromatic and aliphatic hydroxyl groups. In this study, a comprehensive analytical method was developed to fully understand and evaluate the pyrolysis products produced from softwood barks, which could offer valuable information on the pyrolysis mechanism of biomass and promote better utilization of pyrolysis products. |
format | Online Article Text |
id | pubmed-6780934 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-67809342019-10-30 A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks Ben, Haoxi Wu, Fengze Wu, Zhihong Han, Guangting Jiang, Wei Ragauskas, Arthur J. Polymers (Basel) Article Pyrolysis of raw pine bark, pine, and Douglas-Fir bark was examined. The pyrolysis oil yields of raw pine bark, pine, and Douglas-Fir bark at 500 °C were 29.18%, 26.67%, and 26.65%, respectively. Both energy densification ratios (1.32–1.56) and energy yields (48.40–54.31%) of char are higher than pyrolysis oils (energy densification ratios: 1.13–1.19, energy yields: 30.16–34.42%). The pyrolysis oils have higher heating values (~25 MJ/kg) than bio-oils (~20 MJ/kg) from wood and agricultural residues, and the higher heating values of char (~31 MJ/kg) are comparable to that of many commercial coals. The elemental analysis indicated that the lower O/C value and higher H/C value represent a more valuable source of energy for pyrolysis oils than biomass. The nuclear magnetic resonance results demonstrated that the most abundant hydroxyl groups of pyrolysis oil are aliphatic OH groups, catechol, guaiacol, and p-hydroxy-phenyl OH groups. The aliphatic OH groups are mainly derived from the cleavage of cellulose glycosidic bonds, while the catechol, guaiacol, and p-hydroxy-phenyl OH groups are mostly attributed to the cleavage of the lignin β–O-4 bond. Significant amount of aromatic carbon (~40%) in pyrolysis oils is obtained from tannin and lignin components and the aromatic C–O bonds may be formed by a radical reaction between the aromatic and aliphatic hydroxyl groups. In this study, a comprehensive analytical method was developed to fully understand and evaluate the pyrolysis products produced from softwood barks, which could offer valuable information on the pyrolysis mechanism of biomass and promote better utilization of pyrolysis products. MDPI 2019-08-23 /pmc/articles/PMC6780934/ /pubmed/31450759 http://dx.doi.org/10.3390/polym11091387 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Ben, Haoxi Wu, Fengze Wu, Zhihong Han, Guangting Jiang, Wei Ragauskas, Arthur J. A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks |
title | A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks |
title_full | A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks |
title_fullStr | A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks |
title_full_unstemmed | A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks |
title_short | A Comprehensive Characterization of Pyrolysis Oil from Softwood Barks |
title_sort | comprehensive characterization of pyrolysis oil from softwood barks |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6780934/ https://www.ncbi.nlm.nih.gov/pubmed/31450759 http://dx.doi.org/10.3390/polym11091387 |
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