Abstract
The thermal decomposition of methane at constant temperatures and densities ranging from 0.05 to 0.524 g/cm3 has been simulated using methods of molecular dynamics and equilibrium thermodynamics. The molecular-dynamics simulation of the initial stage of methane decomposition has been performed using the reaction force field ReaxFF-lg at temperatures of 2500–4000 K. The simulation results showed that the methane decomposition consists of the successive formation and decay of radicals and light hydrocarbons and their replacement with polyatomic hydrocarbons of increasing complexity, similar to polycyclic aromatic hydrocarbons, whose decomposition and aggregation leads to generation of condensed-carbon nucleation centers. In turn, the results of the thermodynamic calculations indicate that the methane decomposition begins and occurs at lower temperatures as compared with the results of ultrashort nonequilibrium calculations by the molecular dynamics method. Thus, the application of molecular dynamics and thermodynamics methods for the same process presents extreme versions of possible sequences of states in the cases of ultrashort nonequilibrium and long-term, similar to equilibrium, processes of methane thermal decomposition.
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Funding
This work was supported by the Ministry of Science and Higher Education of the Russian Federation (agreement with the Joint Institute for High Temperatures of the Russian Academy of Sciences, no. 075-15-2020-785 on September 23, 2020).
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Translated by Yu. Sin’kov
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Kudinov, A.V., Gubin, S.A. & Bogdanova, Y.A. Simulation of the Thermal Decomposition of Methane at Constant Volume and Temperature Using Methods of Molecular Dynamics and Thermodynamics. High Temp 61, 508–516 (2023). https://doi.org/10.1134/S0018151X23040077
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DOI: https://doi.org/10.1134/S0018151X23040077