期刊
RSC ADVANCES
卷 4, 期 56, 页码 29840-29846出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra02007c
关键词
-
资金
- USDA National Institute of Food and Agriculture [2011-68005-30410]
- NSF [CHE-0840501]
The existence of radicals in pyrolysis oil generated from loblolly pine in three different reactor systems was verified with electron paramagnetic resonance (EPR) spectroscopy. Characterization of the bio-oil via its sub-fractions revealed the radicals were preferentially located in the bio-oil lignin fraction, especially in the higher molecular weight lignin. Based on the observed EPR spectra (which lacked hyperfine structure) and low g-factors, the radicals are proposed to be stable, carbon-centered and delocalized in a highly conjugated lignin pi system. Furthermore, this study also examined the impact of radicals on bio-oil aging severity using an accelerated aging method and the addition of radical scavengers. Preliminary results support the hypothesis that bio-oil radicals are present in a stable state because radical scavengers showed negligible effects on controlling pyrolytic lignin condensation. Only a mild radical concentration reduction was observed after bio-oil accelerated aging.
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