3-甲基丁酮与OH自由基反应的速率常数及其机理研究
THE RATE CONSTANT AND MECHANISM FOR THE REACTION OF METHYL ISOPROPYL KETONE WITH OH RADICALS
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摘要: 在(298±3)K的温度下,采用相对速率法测得了3-甲基丁酮与OH自由基在气相中的反应速率常数:k=(2.6±0.4)×10-12cm3·molecule-1·s-1.该结果与根据结构活性法估算的结果相一致.实验中还测定了该反应的主要产物:丙酮、甲醛和过氧乙酰基硝酸酯(PAN),讨论了该气体在NOx存在下与OH自由基反应的机理.根据上述实验结果讨论了3-甲基丁酮对对流层臭氧浓度的影响:3-甲基丁酮在大气对流层中的氧化反应活性不高,它的主要氧化产物丙酮同样具有低的反应活性.因此,3-甲基丁酮对大气中臭氧生成的贡献不是很大.Abstract: The rate constant for the reaction of Methyl Isopropyl Ketone, (CH3)2CHC(O)CH3, with OH radicals, was determined at (298�3) Kusing a relative rate method : k=(2.6�0.4)�10-12cm3·molecule-1·s-1 and had been found in good agreement with SAR (structure-activity relationship) estimations . The results also showed the formation of the principal products, i.e .,acetone, formaldehyde and PAN.The mechanism of this reaction was discussed and their atmospheric implications were also briefly discussed.Results implied t hat MIPK did not have large ozone potentials in atmosphere.
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Key words:
- methyl isopropyl ketone /
- OH radical /
- relative rate constant /
- mechanism
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