高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (6): 1131.

• 研究论文 • 上一篇    下一篇

F+CH2CO的反应机理和动力学研究

侯华, 王少坤, 王宝山, 顾月姝   

  1. 山东大学化学与化工学院, 济南 250100
  • 收稿日期:2001-05-11 出版日期:2002-06-24 发布日期:2002-06-24
  • 通讯作者: 顾月姝(1939年出生),女,教授,博士生导师,主要从事化学反应动力学研究.E-mail:guojz@icm.sdu.edu.cn E-mail:guojz@icm.sdu.edu.cn
  • 基金资助:

    高等学校博士学科点专项科研基金(批准号:1999042201)资助

Reaction Mechanism and Kinetics for the F+ CH2CO Reaction

HOU Hua, WANG Shao-Kun, WANG Bao-Shan, GU Yue-Shu   

  1. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
  • Received:2001-05-11 Online:2002-06-24 Published:2002-06-24

摘要: 用G3(MP2)方法对F与CH2CO的反应进行研究,揭示了该反应的加成-消除机理.F原子首先与CH2CO作用形成富能的中间体CH2FCO*,此加成反应为无势垒过程.富能的CH2FCO*可进一步发生解离或异构化反应生成各种可能的产物.其中CO和CH2F可能为反应的主要产物.根据从头算的结果,用RRKM-TST理论计算该反应的速率常数.总包反应速率常数与温度存在弱的依赖关系,与总压力无关.

关键词: 从头算, 反应机理, 动力学, 乙烯酮

Abstract: G3(MP2) theory is used to study the F+CH2COreaction. The calculations reveal a typical addition elimination mechanism for the title reaction. The reaction starts with Fand (CH2CO) reacting with each other to form the activated intermediate (CH2FCO)*. This association reaction is found to be a barrierless process. CH2FCO* can undergo further decomposition and isomerization reactions leading to various possible products. COand CH2Fare found to be the dominant products. RRKM-TST method is used to calculate the total and individual rate constants. The total rate constant shows a weak temperature dependence and a pressure independence.

Key words: Ab initio, Reaction mechanism, Kinetics, Ketene

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