Kinetics and Products of Vinyl + 1,3-Butadiene, a Potential Route to Benzene
Abstract
The reaction between vinyl radical, C2H3, and 1,3-butadiene, 1,3-C4H6, has long been recognized as a potential route to benzene, particularly in 1,3-butadiene flames, but the lack of reliable rate coefficients has hindered assessments of its true contribution. Here, by using laser flash photolysis and visible laser absorbance (λ = 423.2 nm), we measured the overall rate coefficient for C2H3 + 1,3-C4H6, k1, at 297 K ≤ T ≤ 494 K and 4 ≤ P ≤ 100 Torr. k1 was in the high-pressure limit in this range and could be fit by the simple Arrhenius expression k1 = (1.1 ± 0.2) × 10–12 cm3 molecule–1 s–1 exp(–9.9 ± 0.6 kJ mol–1/RT). Using photoionization time-of-flight mass spectrometry, we also investigated the products formed. At T ≤ 494 K and P = 25 Torr, we found only C6H9 adduct species, while at 494 K ≤ T ≤ 700 K and P = 4 Torr, we observed ≤~10% branching to cyclohexadiene in addition to C6H9. Quantum chemistry master-equation calculations using the modified strong collision model indicate that n-C6H9 is the dominant product at low temperature, consistent with our experimental results, and predict the rate coefficient and branching ratios at higher T where chemically activatedmore »
- Authors:
-
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Tianjin Univ. (China)
- Alexandria Univ. (Egypt)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Combustion Energy Frontier Research Center (CEFRC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); China Scholarship Council; Fulbright Commission and Alexandria Univ.
- OSTI Identifier:
- 1369833
- Grant/Contract Number:
- SC0001198; AC02-05CH11231; 201308120042; NCET-13-0408
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory
- Additional Journal Information:
- Journal Volume: 119; Journal Issue: 28; Related Information: CEFRC partners with Princeton University (lead); Argonne National Laboratory; University of Connecticut; Cornell University; Massachusetts Institute of Technology; University of Minnesota; Sandia National Laboratories; University of Southern California; Stanford University; University of Wisconsin, Madison; Journal ID: ISSN 1089-5639
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Photodissociation; Absorption; Aromatic compounds; Vinyl; Lasers
Citation Formats
Buras, Zachary J., Dames, Enoch E., Merchant, Shamel S., Liu, Guozhu, Elsamra, Rehab M. I., and Green, William H. Kinetics and Products of Vinyl + 1,3-Butadiene, a Potential Route to Benzene. United States: N. p., 2015.
Web. doi:10.1021/jp512705r.
Buras, Zachary J., Dames, Enoch E., Merchant, Shamel S., Liu, Guozhu, Elsamra, Rehab M. I., & Green, William H. Kinetics and Products of Vinyl + 1,3-Butadiene, a Potential Route to Benzene. United States. https://doi.org/10.1021/jp512705r
Buras, Zachary J., Dames, Enoch E., Merchant, Shamel S., Liu, Guozhu, Elsamra, Rehab M. I., and Green, William H. Tue .
"Kinetics and Products of Vinyl + 1,3-Butadiene, a Potential Route to Benzene". United States. https://doi.org/10.1021/jp512705r. https://www.osti.gov/servlets/purl/1369833.
@article{osti_1369833,
title = {Kinetics and Products of Vinyl + 1,3-Butadiene, a Potential Route to Benzene},
author = {Buras, Zachary J. and Dames, Enoch E. and Merchant, Shamel S. and Liu, Guozhu and Elsamra, Rehab M. I. and Green, William H.},
abstractNote = {The reaction between vinyl radical, C2H3, and 1,3-butadiene, 1,3-C4H6, has long been recognized as a potential route to benzene, particularly in 1,3-butadiene flames, but the lack of reliable rate coefficients has hindered assessments of its true contribution. Here, by using laser flash photolysis and visible laser absorbance (λ = 423.2 nm), we measured the overall rate coefficient for C2H3 + 1,3-C4H6, k1, at 297 K ≤ T ≤ 494 K and 4 ≤ P ≤ 100 Torr. k1 was in the high-pressure limit in this range and could be fit by the simple Arrhenius expression k1 = (1.1 ± 0.2) × 10–12 cm3 molecule–1 s–1 exp(–9.9 ± 0.6 kJ mol–1/RT). Using photoionization time-of-flight mass spectrometry, we also investigated the products formed. At T ≤ 494 K and P = 25 Torr, we found only C6H9 adduct species, while at 494 K ≤ T ≤ 700 K and P = 4 Torr, we observed ≤~10% branching to cyclohexadiene in addition to C6H9. Quantum chemistry master-equation calculations using the modified strong collision model indicate that n-C6H9 is the dominant product at low temperature, consistent with our experimental results, and predict the rate coefficient and branching ratios at higher T where chemically activated channels become important. Predictions of k1 are in close agreement with our experimental results, allowing us to recommend the following modified Arrhenius expression in the high-pressure limit from 300 to 2000 K: k1 = 6.5 × 10–20 cm3 molecule–1 s–1 T2.40 exp(–1.76 kJ mol–1/RT).},
doi = {10.1021/jp512705r},
journal = {Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory},
number = 28,
volume = 119,
place = {United States},
year = {Tue Apr 28 00:00:00 EDT 2015},
month = {Tue Apr 28 00:00:00 EDT 2015}
}
Web of Science
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