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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

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2196-7156
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Volume 225, Issue 11-12

Issues

High-Temperature Measurements of the Rate Constants for Reactions of OH with a Series of Large Normal Alkanes: n-Pentane, n-Heptane, and n-Nonane

Genny A. Pang / Ronald K. Hanson / David M. Golden / Craig T. Bowman
Published Online: 2011-11-18 | DOI: https://doi.org/10.1524/zpch.2011.0156

Abstract

Rate constants for the overall reactions of OH with n-pentane, n-heptane, and n-nonane were measured in shock tube experiments behind reflected shock waves. Narrow-linewidth laser absorption by OH at 306.7 nm was used in pseudo first-order experiments with temperatures between 869 to 1364 K. tert-Butyl hydroperoxide (TBHP) was used as the OH precursor. Experiments were also performed to study the kinetics of the TBHP decomposition and resulting product chemistry, and an accurate mechanism describing OH precursor chemistry effects was developed to model OH concentration time-history in the n-alkane + OH experiments. The experimental results for the n-alkane + OH rate constant measurements can be expressed as rate constants in Arrhenius form as

k n-pentane + OH = 2.10 × 10-10 exp(-2038/T[K]) (869–1364 K),

k n-heptane + OH = 2.43 × 10-10 exp(-1804/T[K]) (869–1364 K),

k n-nonane + OH = 3.17 × 10-10 exp(-1801/T[K]) (884–1352 K),

each in units of cm3 molecule-1 s-1. The present rate constants measured for OH with n-pentane and n-heptane show agreement within 20% with recent work by Sivaramakrishnan and Michael [J. Phys. Chem. A, 113 (2009) 5047]. The measurements of the rate constant for n-nonane + OH presented here represent the first in the literature to depict the temperature dependence of the rate constant above 800 K. The measurements of each n-alkane + OH rate constant studied were compared with two models in the literature used to estimate the rate constants of n-alkane + OH reactions. The Structure-Activity Relationship of Kwok and Atkinson [Atmos. Environ., 29 (1995) 1685] shows the best agreement with the current data for all three n-alkanes over the entire temperature range studied, demonstrating that this model is capable of predicting the overall rate constants for reactions of OH with n-pentane, n-heptane, and n-nonane for temperatures up to 1364 K.

Keywords: OH; Alkanes; Rate constant measurement; Shock tubes; Laser absorption

About the article

* Correspondence address: Stanford University, 452 Escondido Mall, Building 520 Room 520-I, Stanford, CA 94305, U.S.A.,


Published Online: 2011-11-18

Published in Print: 2011-12-01


Citation Information: Zeitschrift für Physikalische Chemie, Volume 225, Issue 11-12, Pages 1157–1178, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2011.0156.

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© by Oldenbourg Wissenschaftsverlag, Stanford, CA 94305, Germany.Get Permission

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