Identification of free radicals in pyrolysis oil and their impact on bio-oil stability

Meng, Jiajia, Tatyana I. Smirnova, Xiao Song, Andrew Moore, Xueyong Ren, Stephen Kelley, Sunkyu Park, and David Tilotta. 2014. RSC Advances 4 (56): 29840–46. doi:10.1039/C4RA02007C.

Type Journal Article
Author Jiajia Meng
Author Tatyana I. Smirnova
Author Xiao Song
Author Andrew Moore
Author Xueyong Ren
Author Stephen Kelley
Author Sunkyu Park
Author David Tilotta
Volume 4
Issue 56
Pages 29840-29846
Publication RSC Advances
ISSN 2046-2069
Date , 2014
Journal Abbr RSC Adv.
DOI 10.1039/C4RA02007C
Abstract 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 [small 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.
Date Added 10/24/2014, 2:24:48 PM
Modified 10/28/2014, 3:27:50 PM


  • Aging
  • Biomass
  • Carbon
  • Condensation
  • Lignins
  • Molecular weight
  • Oils
  • Pyrolysis
  • Storage
  • Weight

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