期刊
COMBUSTION SCIENCE AND TECHNOLOGY
卷 193, 期 3, 页码 470-484出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00102202.2019.1661999
关键词
Reactive molecular dynamics; mechanism; nitroglycerin (NG); reaction pathway
The decomposition processes of nitroglycerin at various temperatures were simulated and analyzed, showing that the reactions accelerate with increasing temperature, resulting in NO2, NO, HNO, CO2, N-2, and H2O as the main products with CO2, N-2, and H2O as final products. Kinetic parameters were calculated for different stages, and a detailed mechanism of initial thermal decomposition of NG under high temperatures was proposed.
The decomposition processes of nitroglycerin (NG) at various temperatures (2500, 2750, 3000, 3250 and 3500 K) are simulated by the reactive molecular dynamics simulations with ReaxFF-lg. The initial decomposition pathway of NG, the evolution of the main products and the reaction kinetic parameters for the different stages are analyzed. The results show that the main initial decomposition mechanisms of NG are O-NO2 bond dissociation and the hydrogen capture reaction of NO2. The main products of NG thermal decomposition are NO2, NO, HNO, CO2, N-2, and H2O, while CO2, N-2,N- and H2O are the final products. As the temperature increases, the processes of O-NO2 bond dissociation and the hydrogen capture reaction of NO2 accelerate, resulting in accelerated decomposition of NG. The reaction kinetic parameters are calculated for three different reaction stages. The activation energy and the pre-exponential factor obtained in the initial decomposition stage are 69.58 kcal mol(-1) and 32.53 s(-1). The activation energy and the pre-exponential factor obtained in the intermediate decomposition stage are 111.78 kcal mol(-1) and 29.12 s(-1). At 3250 K, the rate constants of N-2 and CO2 reach maximum while the rate constant of H2O increases continuously with increasing temperature. Accordingly, the mechanism of initial thermal decomposition of NG under the high temperatures is proposed detailedly.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据