Effect of CO2 Additives on the Non-Catalytic Conversion of Natural Gas into Syngas and Hydrogen
- Authors: Akhunyanov A.R.1, Arutyunov A.V.1, Vlasov P.A.1, Smirnov V.N.1, Arutyunov V.S.1
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Affiliations:
- Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
- Issue: Vol 64, No 2 (2023)
- Pages: 153-172
- Section: Articles
- URL: https://journals.rcsi.science/0453-8811/article/view/136993
- DOI: https://doi.org/10.31857/S0453881123020016
- EDN: https://elibrary.ru/GMLYME
- ID: 136993
Cite item
Abstract
Abstract—
A kinetic analysis of the non-catalytic carbon dioxide reforming of CH4 has been carried out in the temperature range of 1500–1800 K under conditions of variable temperature behind the reflected shock wave. The stages of conversion of methane into synthesis gas, the characteristic time intervals corresponding to these stages, and the most important elementary reactions have been established. At the first stage, as a result of thermal pyrolysis, methane molecules are sequentially converted into ethane, ethylene, and then acetylene, the most stable hydrocarbon in this temperature range. At the second stage, acetylene is normally converted into CO and H2, being accompanied by the formation soot particles in the case of rich mixtures. The conversion of CO2 proceeds at the second and third stages, when CH4 conversion is almost complete. It occurs as a result of the interaction of CO2 molecules with H● atoms arising in the reacting system and leads to the formation of CO molecules and OH● radicals. Acetylene is predominantly consumed in the reaction with OH radicals. A high concentration of acetylene during methane reforming promotes the intensive formation of soot nuclei, for which acetylene makes the highest contribution to the rate of their surface growth. At the same time, acetylene itself is not a precursor of soot particle nuclei, which are mainly formed from \({{{\text{C}}}_{{\text{3}}}}{\text{H}}_{3}^{\centerdot }\) radicals.
About the authors
A. R. Akhunyanov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: shocktube@yandex.ru
Russia, 119991, Moscow, Kosygin st., 4
A. V. Arutyunov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: shocktube@yandex.ru
Russia, 119991, Moscow, Kosygin st., 4
P. A. Vlasov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Author for correspondence.
Email: shocktube@yandex.ru
Russia, 119991, Moscow, Kosygin st., 4
V. N. Smirnov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: shocktube@yandex.ru
Russia, 119991, Moscow, Kosygin st., 4
V. S. Arutyunov
Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
Email: shocktube@yandex.ru
Russia, 119991, Moscow, Kosygin st., 4
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