期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 107, 期 32, 页码 6206-6211出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp034165g
关键词
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In kinetic models, gas-phase reactions involving large molecules (of more than about a dozen atoms) are often assumed to be in the high-pressure limit, that is, to not exhibit significant falloff or chemical activation effects. However, cases are known where rather large molecules are indeed involved in chemically activated, pressure-dependent reactions particularly at high temperatures. Here, we present simple formulas giving guidance for deciding whether a particular reaction's rate can be accurately approximated using the high-pressure limit rate constant k(infinity)(T). We find that under practical combustion conditions for liquid and gaseous fuels, few reactions are truly in the high-pressure limit, regardless of the size of the molecules involved.
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