Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (11): 20230276.doi: 10.7503/cjcu20230276

• Physical Chemistry • Previous Articles     Next Articles

Molecular Dynamics Simulation Study on High Temperature Oxidation Mechanism of n-Propylbenzene

ZHOU Zihao, WANG Sihao, HUANG Daichuan, LIU Bo, NING Hongbo()   

  1. Key Laboratory of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China
  • Received:2023-06-10 Online:2023-11-10 Published:2023-09-04
  • Contact: NING Hongbo E-mail:hbning@swjtu.edu.cn
  • Supported by:
    the Natural Science Foundation of Sichuan Province, China(2023NSFSC1105);the Fundamental Research Funds for the Central Universities, China(2682023ZTPY019);the Project of Key R&D Program of Sichuan Province, China(2022YFG0033)

Abstract:

n-Propylbenzene is a typical aromatic substitute component of Jet A, Jet A-1 and RP-3 aviation kerosene. In this work, the main oxidation reaction networks and the product distributions of n-propylbenzene at different temperatures, densities and equivalence ratios were investigated by ReaxFF based on reactive molecular dynamics simulation. The reaction kinetics theory was also employed to calculate the rate constants of n-propylbenzene oxidation. The results show that the consumption of n-propylbenzene mainly occurs in the alkyl side chain including six C—C and C—H bond fissions of unimolecular reactions and three H-abstraction reactions by O2 and other small radicals. Due to the lowest bond dissociation energy, the C—C bond fission adjacent to benzyl radical is the most important consumption channel but the contributions of all H-abstraction reactions are similar. The simulated temperature and density/pressure are positively correlated with the oxidation rate of n-propylbenzene, while the effect of equivalence ratio is heavily dependent on the system temperature. Additionally, the calculated apparent activation energies and pre-exponential factors are acceptable compared to the reported experimental results.

Key words: n-Propylbenzene, Reaction mechanism, High temperature oxidation, ReaxFF, Molecular dynamics simulation

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