31P-NMR analysis of bio-oils obtained from the pyrolysis of biomass
Background: The use of 2-chloro-4,4,5,5-tetramethyl-1,3,2-dioxaphospholane followed by 31 P-NMR analysis has been frequently employed to quantitatively characterize the structure of hydroxyl groups in lignin and, more recently, biodiesel. This technique serves as a valuable tool to determine aliphat...
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Published in | Biofuels (London) Vol. 1; no. 6; pp. 839 - 845 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
London, UK
Future Science Ltd
01.11.2010
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Online Access | Get full text |
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Summary: | Background: The use of 2-chloro-4,4,5,5-tetramethyl-1,3,2-dioxaphospholane followed by
31
P-NMR analysis has been frequently employed to quantitatively characterize the structure of hydroxyl groups in lignin and, more recently, biodiesel. This technique serves as a valuable tool to determine aliphatic hydroxyls, phenolics and carboxylic acid groups in lignin and aliphatic hydroxyl groups in partially substituted glycerols. Results: This study demonstrates the application of this analytical technique to pyrolysis oils to allow efficient analysis and identification of important functional groups present in bio-oils and the measurement of moisture content. Conclusion: Phosphitylation followed by
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P-NMR analysis was used to show that the moisture content of the loblolly pine bio-oil used in this study was 11.94%. The results also established that the bio-oils obtained from loblolly pine cellulose had higher levoglucosan content than the bio-oil obtained from the starting pine itself. In addition, the total phenolic content of bio-oil derived from loblolly pine milled wood lignin was greater than that obtained from the bio-oil from the loblolly pine cellulose. The data also highlighted the ability to track chemical transitions that take place during pyrolysis using
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P-NMR. |
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ISSN: | 1759-7269 1759-7277 |
DOI: | 10.4155/bfs.10.57 |