UV absorption studies of the pyrolysis of isobutane in shock waves.
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概要
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The UV absorption measurements at 216 nm were carried out for two shock-heated mixtures, 1.5 and 2.0% <I>i</I>-C<SUB>4</SUB>H<SUB>10</SUB> diluted in Ar, in the temperature range of 1300–1800 K, and at an atmospheric pressure of about half. From the initial absorption rise attributed to the CH<SUB>3</SUB> growth, the rate constant of the initiation reaction, <I>i</I>-C<SUB>4</SUB>H<SUB>10</SUB>=CH<SUB>3</SUB>+<I>i</I>-C<SUB>3</SUB>H<SUB>7</SUB>, was evaluated as <I>k</I>=10<SUP>12.8±0.5</SUP>exp[−(60.8±4.6) kcal/<I>RT</I>]/s<SUP>−1</SUP>. A comparison between the <I>k</I> value so derived and the formerly reported values was made. A computer modeling using a 39-reaction mechanism could reproduce the absorption at the early stage of the reaction at temperatures lower than 1550 K, whereas the modeled absorption was smaller than the measured at much high temperatures. The absorption by C<SUB>3</SUB>H<SUB>5</SUB> (allyl radical) must be taken into account in order to lessen this difference.
- 公益社団法人 日本化学会の論文
著者
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Koike Tohru
Department Of Applied Chemistry National Defense Academy
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Morinaga Kihei
Department of Chemistry Defense Academy
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