Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 34, Issue -, Pages 279-287Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2012.06.165
Keywords
Benzene; Fulvene; Naphthalene; PAH; Theoretical chemical kinetics
Funding
- Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy [DE-AC04-94-AL85000]
Ask authors/readers for more resources
The H-assisted isomerization of fulvene to benzene is characterized in detail using quantum chemistry, transition state theory, classical trajectory, and master equation calculations. This multistep isomerization involves 10 transition states, nine of which are found to contribute non-negligibly to the overall kinetics. Calculated temperature- and pressure-dependent rate coefficients are presented for H + fulvene --> products, with care taken to quantify uncertainties in the theoretical predictions arising from various aspects of the calculation. The rate coefficients agree with past theoretical work within these estimated uncertainties. This fast isomerization proceeds via a cyclopropylcarbinyl intermediate-a substituted cyclopropyl group adjacent to a radical carbon-that provides a facile route for the carbon bonding rearrangement. Analogous H-assisted isomerization pathways involving cyclopropylcarbinyl intermediates are characterized using quantum chemistry calculations for four second-ring isomers of naphthalene: fulvalene, azulene, 1-methyleneindene, and 2-methyleneindene. These processes, and those for larger polycyclic aromatic hydrocarbons (PAHs), may be characterized in a general way as occurring in five steps: H additions, H shifts, cyclopropylcarbinyl intermediate formation, cyclopropylcarbinyl intermediate ring opening, and H-atom regeneration. Trends in the energetics of each of these steps with respect to PAH size and composition are discussed. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available