Journal ArticleDOI
Decomposition and ring expansion in methylcyclopentadiene: single-pulse shock tube and modeling study
Assa Lifshitz,Carmen Tamburu,Aya Suslensky,Faina Dubnikova +3 more
- Vol. 30, Iss: 1, pp 1039-1047
TLDR
In this paper, the thermal reactions of methylcyclopentadiene diluted in argon were studied behind reflected shock waves in a 2-in. i.d. pressurized driver single-pulse shock tube over the temperature range 1070-1270 K and overall densities of ∼3-×-10−5 mol/cm3.Abstract:
The thermal reactions of methylcyclopentadiene diluted in argon were studied behind reflected shock waves in a 2 in. i.d. pressurized driver single-pulse shock tube over the temperature range 1070–1270 K and overall densities of ∼3 × 10−5 mol/cm3. A plethora of products resulting from decompositions and ring expansion were found in the post-shock samples. They were, in order of decreasing abundance, cyclopentadiene, benzene, methane, ethane, naphthalene, acetylene, ethylene, C4H4, toluene, C3H4, and indene. Very minute yields of some other compounds were also observed. Production of all the products involves free radical reactions. The initiation of the free radical mechanisms in the decomposition of methylcyclopentadiene takes place via ejection of hydrogen atoms from SP3 carbons and dissociation of the methyl group attached to the ring. The H atoms and the methyl radicals initiate free radical reactions by abstraction of hydrogen atoms from SP3 carbons and by dissociative recombination of H atom and removal of a methyl group from the ring. In addition to these dissociations, there are several reactions that involve β-cleavage in the five-membered ring radical intermediates to produce open chain intermediates that then decompose to stable and unstable fragments. The ring expansion process that leads to the production of high yield of benzene takes place mainly from the methylene cyclopentadienyl intermediate. Ring expansion from methylcyclopentadiene itself does not take place. The total decomposition of methylcyclopentadiene in terms of a first-order rate constant is given by ktotal = 1011.31 exp (−46.6 × 103/RT) s−1. A reaction scheme containing 40 species and 105 elementary reactions was composed and computer simulation was performed over the temperature range 1050–1300 K at 25 K intervals. The agreement between the experimental results and the model prediction for most of the products is satisfactory.read more
Citations
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Journal ArticleDOI
Detailed chemical kinetic models for the low-temperature combustion of hydrocarbons with application to gasoline and diesel fuel surrogates
TL;DR: A review of gas phase detailed kinetic models developed to simulate the low-temperature oxidation and autoignition of gasoline and diesel fuel components (alkanes, ethers, esters, alkenes, cycloalkane, aromatics, including from four atoms of carbon) is presented in this paper.
Journal ArticleDOI
Current technologies for analysis of biomass thermochemical processing: a review.
TL;DR: The various analytical methods of biomass pyrolysis/gasification processing are discussed, including reactor types, analytical tools, and recent examples in the areas of compositional analysis, structural analysis, reaction mechanisms, and kinetic studies on biomass thermochemical processing.
Journal ArticleDOI
Thermal decomposition of n-dodecane: Experiments and kinetic modeling
TL;DR: In this article, the thermal decomposition of n-dodecane, a component of some jet fuels, has been studied in a jet-stirred reactor at temperatures from 773 to 1073 K, at residence times between 1 and 5 s and at atmospheric pressure.
Journal ArticleDOI
Radical chemistry in the thermal decomposition of anisole and deuterated anisoles: an investigation of aromatic growth.
TL;DR: The results confirm that the first steps in the thermal decomposition of anisole are the loss of a methyl group to form phenoxy radical, followed by ejection of a CO to form cyclopentadienyl radical (c-C(5)H(5).
Journal ArticleDOI
Thermal decomposition mechanisms of the methoxyphenols: formation of phenol, cyclopentadienone, vinylacetylene, and acetylene.
Adam M. Scheer,Adam M. Scheer,Calvin Mukarakate,David J. Robichaud,Mark R. Nimlos,G. Barney Ellison +5 more
TL;DR: The pyrolyses of the guaiacols or methoxyphenols (o, m-, and p-HOC(6)H(4)OCH(3)) have been studied using a heated SiC microtubular (μ-tubular) reactor and it is suggested that phenol results from a radical/radical reaction.
References
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Journal ArticleDOI
Chemical Kinetic Data Base for Combustion Chemistry. Part I. Methane and Related Compounds
W. Tsang,R. F. Hampson +1 more
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Donald L. Baulch,Carlos J. Cobos,Richard A. Cox,P. Frank,Garry Hayman,Th. Just,J. A. Kerr,T. Murrells,M. A. Pilling,Jürgen Troe,Raymond W. Walker,J. Warnatz +11 more
TL;DR: In this article, a compilation of kinetic data on elementary, homogeneous, gas phase reactions of neutral species involved in combustion systems has been presented under the auspices of the European Community Energy Research and Development Program.
Journal ArticleDOI
Evaluated Kinetic Data for Combustion Modeling: Supplement II
Donald L. Baulch,Craig T. Bowman,Carlos J. Cobos,R. A. Cox,Th. Just,J. A. Kerr,Michael J. Pilling,D. Stocker,J. Troe,Wing Tsang,Raymond W. Walker,J. Warnatz +11 more
TL;DR: In this paper, a compilation of kinetic data on elementary, homogeneous, gas phase reactions of neutral species involved in combustion systems has been presented under the auspices of the European Community Energy Research and Development Program.
Journal ArticleDOI
Predictions of pressure and temperature effects upon radical addition and recombination reactions
Journal ArticleDOI
Reaction mechanisms in aromatic hydrocarbon formation involving the C5H5 cyclopentadienyl moiety
TL;DR: In this article, the quantum chemical BAC-MP4 and BACMP2 methods have been used to investigate the reaction mechanisms leading to polycyclic aromatic hydrocarbon (PAH) ring formation, in particular the elementary reaction steps in the conversion of two cyclopentadienyl radicals to naphthalene.
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