Shock-Tube Measurement of Acetone Dissociation Using Cavity-Enhanced Absorption Spectroscopy of CO

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• 作者：Shengkai Wang ; Kai Sun ; David F. Davidson ; Jay B. Jeffries ; Ronald K. Hanson
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：July 16, 2015
• 年：2015
• 卷：119
• 期：28
• 页码：7257-7262
• 全文大小：421K
• ISSN：1520-5215

文摘

A direct measurement for the rate constant of the acetone dissociation reaction (CH₃COCH₃ = CH₃CO + CH₃) was conducted behind reflected shock wave, utilizing a sub-ppm sensitivity CO diagnostic achieved by cavity-enhanced absorption spectroscopy (CEAS). The current experiment eliminated the influence from secondary reactions and temperature change by investigating the clean pyrolysis of <20 ppm acetone in argon. For the first time, the acetone dissociation rate constant (k₁) was directly measured over 5.5 orders of magnitude with a high degree of accuracy: k₁ (1004鈥?494 K, 1.6 atm) = 4.39 脳 10⁵⁵ T^鈥?1.394 exp(鈭?2鈥?40K/T) 卤 24% s^鈥?. This result was seen to agree with most previous studies and has bridged the gap between their temperature and pressure conditions. The current work also served as an example demonstration of the potential of using the CEAS technique in shock-tube kinetics studies.