物理化学学报 >> 1994, Vol. 10 >> Issue (03): 223-229.doi: 10.3866/PKU.WHXB19940307

研究论文 上一篇    下一篇

异丁烷高温热解反应动力学和机理

应立明, 韩德刚, 杨惠星   

  1. 北京大学化学系,北京 100871
  • 收稿日期:1992-09-08 修回日期:1993-02-04 发布日期:1994-03-15
  • 通讯作者: 应立明

Reaction Kinetics and Mechanism of the Pyrolysis of Isobutane at High Temperature

Ying Li-Ming, Han De-Gang, Yang Hui-Xing   

  1. Department of Chemistry, Peking University, Beijing 100871
  • Received:1992-09-08 Revised:1993-02-04 Published:1994-03-15
  • Contact: Ying Li-Ming

摘要:

用激波管激光纹影技术测定了异丁烷高温热解反应信号,对热解过程中重要单分子反应的降变行为作了理论计算,建立了由五十个基元反应组成的反应机理并进行了计算机模拟,本文得到引发反应i-C_4H_(10)→CH_3+i-C_3H_7在温度为1500-1850 K,压1.00×10~4-2.00×10~4 Pa时的速率常数为k_1=6.22×10~(11) exp(-457000/RT)±50%(S~(-1)).这一结果与降变理论计算符合得很好.

关键词: 热解, 反应动力学, 反应机理, 激波

Abstract:

The pyrolysis reaction signals of isobutane at high temperature have been measured by the shock-tube laser-schlirene technique. The fall-offe of some essential uni molecular reactions occuring in the pyrolysis process have been calculated theoretically. A mechanism including fifty elementary reactions has been established and simulated by computer. Rate constant of the initial reaction i-C_4H_(10)→CH_3+i-C_3H_7 obtained at temperature of 1500—1800 K and pressure of 1.00 ×10~4-2.00×10~4 Pa was k_1=6.22×10~(11) exp (-457000/RT)±50%(s~(-1)). The result was well accordant with the theoretical fall-off calculation.

Key words: Pyrolysis, Reaction kinetics, Reaction mechanism, Shock wave