Kinetic study and modeling of the hetero-homogeneous pyrolysis and oxidation of isobutane around 800 K. Part II. Pyrolysis in pyrex reactors packed with platinum foils or PbO-treated pyrex rods

Zils, R.; Martin, René; Perrin, D. D.

doi:10.1002/(sici)1097-4601(1998)30:6<439::aid-kin6>3.0.co;2-t

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…Although the diffusivity of HO 2 and RO 2 radicals is less than that of the smaller species (H atoms and OH radicals), this is offset by their more significant concentration, which gives their wall reactions greater importance. The experimentally determined rate constants of Zils et al for the wall reactions of HO 2 radicals and H atoms show similar orders of magnitude in their reactor operated between 2.6 and 26 kPa and 773 and 793 K, so mass transfer and concentration in the gas phase are the greatest factors controlling the rate of wall loss of these species.…”

Section: Definition Of the Wall Reactions And Their Rate Parametersmentioning

confidence: 84%

A Tentative Modeling Study of the Effect of Wall Reactions on Oxidation Phenomena

et al. 2008

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Simulations have been performed with spatial uniformity assumed, in order to assess the effect of tentative wall reactions on autoignition delay times and on a pressure -ambient temperature diagram of oxidation phenomena in the case of n-butane. Reactions which depend on the type of reactor wall coating have been considered for HO and RO radicals with estimated rate constants. The inhibiting effect of these walls has been simulated for closed vessel autoignition delay times as well as for ignition boundaries at pressures below 1 atm. The minimum temperature at which reaction occurs in jet-stirred reactor simulations is similarly affected 2 2.

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Section: Definition Of the Wall Reactions And Their Rate Parametersmentioning

confidence: 84%

A Tentative Modeling Study of the Effect of Wall Reactions on Oxidation Phenomena

et al. 2008

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Kinetic study and modeling of the hetero-homogeneous pyrolysis and oxidation of isobutane around 800 K. Part I. Pyrolysis in an unpacked pyrex reactor

Zils

Martin

Perrin

1998

Int. J. Chem. Kinet.

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Isobutane pyrolysis is studied in an unpacked Pyrex reactor at 20–100 torr initial pressures and 750–793 K. Results are interpreted in terms of a long chain radical mechanism and the reaction is modeled. The reaction selectivity or ratio of the initial production rate of isobutene (or hydrogen) to that of propene (or methane) is practically given by the ratio of the rate constant of abstraction of a tertiary hydrogen atom of isobutane to that of a primary one. A sensitivity analysis clearly shows that self‐inhibition is essentially due to methylallyl radicals produced by hydrogen abstraction from isobutene. The model has been manually adjusted to experimental results and most of the adjusted rate constants are in agreement with literature data. © 1998 John Wiley & Sons, Inc. Int J Chem Kinet: 30: 425–437, 1998

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The hetero‐homogeneous pyrolysis of propane, in the presence or in the absence of dihydrogen, and the measurement of uptake coefficients of hydrogen atoms

Perrin¹,

Martin²

2000

Int J of Chemical Kinetics

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Propane pyrolysis is studied in the presence and the absence of dihydrogen between 743 and 803 K, in the propane pressure range 10-100 Torr, and at 20-254 Torr dihydrogen pressure. In unpacked Pyrex reactors, dihydrogen accelerates propane dehydrogenation and demethanation. The reaction is modeled by a conventional homogeneous free-radical chain mechanism.Propane pyrolysis is strongly inhibited by the walls of reactors packed with stainless steel, zirconium, or palladium foils. Adding dihydrogen to propane still increases the rates of product formation. The reaction in these packed reactors is modeled by the kinetic scheme proposed for the homogeneous reaction and by the heterogeneous process THE HETERO-HOMOGENEOUS PYROLYSIS OF PROPANE 341In the presence of dihydrogen, steps (w 2 ) and (Ϫw 2 ) are instantaneously at equilibrium. The latter system should be useful to study any reaction of hydrogen atoms in the temperature range.

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Kinetic study and modeling of the hetero-homogeneous pyrolysis and oxidation of isobutane around 800 K. Part II. Pyrolysis in pyrex reactors packed with platinum foils or PbO-treated pyrex rods

Cited by 4 publications

References 15 publications

A Tentative Modeling Study of the Effect of Wall Reactions on Oxidation Phenomena

A Tentative Modeling Study of the Effect of Wall Reactions on Oxidation Phenomena

Kinetic study and modeling of the hetero-homogeneous pyrolysis and oxidation of isobutane around 800 K. Part I. Pyrolysis in an unpacked pyrex reactor

The hetero‐homogeneous pyrolysis of propane, in the presence or in the absence of dihydrogen, and the measurement of uptake coefficients of hydrogen atoms

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