Toward understanding of bio-oil aging: accelerated aging of bio-oil fractions

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Meng, Jiajia, Andrew Moore, David Tilotta, Stephen Kelley, and Sunkyu Park. 2014. ACS Sustainable Chemistry & Engineering 2 (8): 2011–18. doi:10.1021/sc500223e.

Type Journal Article
Author Jiajia Meng
Author Andrew Moore
Author David Tilotta
Author Stephen Kelley
Author Sunkyu Park
URL http://dx.doi.org/10.1021/sc500223e
Volume 2
Issue 8
Pages 2011-2018
Publication ACS Sustainable Chemistry & Engineering
ISSN 2168-0485
Date July 11, 2014
Journal Abbr ACS Sustainable Chem. Eng.
DOI 10.1021/sc500223e
Accessed 10/23/2014, 8:00:00 PM
Abstract Pyrolysis bio-oil from biomass is a promising intermediate for producing transportation fuels and platform chemicals. However, its instability, often called aging, has been identified as a critical hurdle that prevents bio-oil from being commercialized. The objective of this research is to explore the bio-oil aging mechanism by an accelerated aging test of fractionated bio-oil produced from loblolly pine. When water soluble (WS), ether insoluble (EIS), and pyrolytic lignin (PL) fractions were aged separately, the increased molecular weight (Mw) was observed with increasing aging temperature and the presence of acids. WS and EIS fractions had high Mw brown solids formed after aging. Adjusting the pH of WS and EIS fractions from 2.5 to 7.0 significantly reduced the tendency of a Mw increase. Similar Mw rise was also observed on a PL fraction with an elevated temperature and acid addition. Formaldehyde was found to react with the PL fraction in the presence of any acid catalysts tested, i.e., 8-fold Mw increase in acetic acid environment, while other bio-oil aldehydes did not significantly promote lignin condensation. To better understand bio-oil stability, a potential bio-oil aging pattern was proposed, suggesting that bio-oil can be aged within or between its fractions.
Date Added 10/24/2014, 2:24:37 PM
Modified 10/28/2014, 2:34:06 PM

Keywords:

 

  • Acetic acid
  • Acids
  • Aging
  • Aldehydes
  • Biomass
  • Condensation
  • Formaldehyde
  • Formic acid
  • Lignins
  • Oils

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