Radical–radical reactions, pyrene nucleation, and incipient soot formation in combustion
Abstract
Here, we present a combined experimental and probabilistic simulation study of soot-precursor. The experiments were conducted using aerosol mass spectrometry coupled with tunable vacuum ultraviolet radiation from the Advanced Light Source at Lawrence Berkeley National Laboratory. Mass spectra and photoionization efficiency (PIE) curves of soot precursor species were measured at different heights in a premixed flat flame and in a counter-flow diffusion flame fueled by ethylene and oxygen. The PIE curves at the pyrene mass from these flames were compared with reference PIE scans recorded for pyrene. The results demonstrate that other C16H10 isomers than pyrene are major components among species condensed onto incipient soot in this study, which is in agreement with the simulations. Species with mass 202 u only have a high prevalence in incipient soot particles drawn from the premixed flame, but hydrocarbon species with sizes in the range 200-400 u are important to incipient-soot formation in both flames. The simulations predict that some species form through combination reactions involving relatively large radicals and bypass traditional molecular-growth pathways through addition of small hydrocarbon species. The experimental results support this prediction; they demonstrate that these species have higher relative abundances in particles formed close to the fuel outletmore »
- Authors:
-
- Sandia National Laboratory (SNL-CA), Livermore, CA (United States)
- University of Michigan, Ann Arbor, MI (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); Alexander von Humboldt Foundation
- OSTI Identifier:
- 1379642
- Alternate Identifier(s):
- OSTI ID: 1397903
- Grant/Contract Number:
- AC02-05CH11231; AC04-94AL85000; SC0002619; AC04-94-AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Proceedings of the Combustion Institute
- Additional Journal Information:
- Journal Volume: 36; Journal Issue: 1; Journal ID: ISSN 1540-7489
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; incipient soot; ethylene flame; PAH; radical reactions; pyrene
Citation Formats
Johansson, K. Olof, Dillstrom, Tyler, Elvati, Paolo, Campbell, Matthew F., Schrader, Paul E., Popolan-Vaida, Denisia M., Richards-Henderson, Nicole K., Wilson, Kevin R., Violi, Angela, and Michelsen, Hope A. Radical–radical reactions, pyrene nucleation, and incipient soot formation in combustion. United States: N. p., 2016.
Web. doi:10.1016/j.proci.2016.07.130.
Johansson, K. Olof, Dillstrom, Tyler, Elvati, Paolo, Campbell, Matthew F., Schrader, Paul E., Popolan-Vaida, Denisia M., Richards-Henderson, Nicole K., Wilson, Kevin R., Violi, Angela, & Michelsen, Hope A. Radical–radical reactions, pyrene nucleation, and incipient soot formation in combustion. United States. https://doi.org/10.1016/j.proci.2016.07.130
Johansson, K. Olof, Dillstrom, Tyler, Elvati, Paolo, Campbell, Matthew F., Schrader, Paul E., Popolan-Vaida, Denisia M., Richards-Henderson, Nicole K., Wilson, Kevin R., Violi, Angela, and Michelsen, Hope A. Wed .
"Radical–radical reactions, pyrene nucleation, and incipient soot formation in combustion". United States. https://doi.org/10.1016/j.proci.2016.07.130. https://www.osti.gov/servlets/purl/1379642.
@article{osti_1379642,
title = {Radical–radical reactions, pyrene nucleation, and incipient soot formation in combustion},
author = {Johansson, K. Olof and Dillstrom, Tyler and Elvati, Paolo and Campbell, Matthew F. and Schrader, Paul E. and Popolan-Vaida, Denisia M. and Richards-Henderson, Nicole K. and Wilson, Kevin R. and Violi, Angela and Michelsen, Hope A.},
abstractNote = {Here, we present a combined experimental and probabilistic simulation study of soot-precursor. The experiments were conducted using aerosol mass spectrometry coupled with tunable vacuum ultraviolet radiation from the Advanced Light Source at Lawrence Berkeley National Laboratory. Mass spectra and photoionization efficiency (PIE) curves of soot precursor species were measured at different heights in a premixed flat flame and in a counter-flow diffusion flame fueled by ethylene and oxygen. The PIE curves at the pyrene mass from these flames were compared with reference PIE scans recorded for pyrene. The results demonstrate that other C16H10 isomers than pyrene are major components among species condensed onto incipient soot in this study, which is in agreement with the simulations. Species with mass 202 u only have a high prevalence in incipient soot particles drawn from the premixed flame, but hydrocarbon species with sizes in the range 200-400 u are important to incipient-soot formation in both flames. The simulations predict that some species form through combination reactions involving relatively large radicals and bypass traditional molecular-growth pathways through addition of small hydrocarbon species. The experimental results support this prediction; they demonstrate that these species have higher relative abundances in particles formed close to the fuel outlet than smaller, lighter molecular species and indicate that these species are important to early formation of incipient-soot precursors. The results also imply that a leading role in incipient-soot precursor formation is played by species with lower thermal stability than the even-carbon numbered, unsubstituted polycyclic aromatic hydrocarbons known as "stabilomers".},
doi = {10.1016/j.proci.2016.07.130},
journal = {Proceedings of the Combustion Institute},
number = 1,
volume = 36,
place = {United States},
year = {Wed Oct 12 00:00:00 EDT 2016},
month = {Wed Oct 12 00:00:00 EDT 2016}
}
Web of Science
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