Mathematical modelling of complex oscillations during ethylene oxidation over nickel catalyst

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The article is devoted to the experimental and theoretical study of complex oscillations during ethylene oxidation on the nickel foil. Mathematical model was based on the 14-stage mechanism of reaction including the stages of oxidation and reduction of the Ni catalyst. An essential condition for the occurrence of an oscillatory behavior of the system was the adsorption of C2H4 and CO from the mobile pre-adsorption state. It was shown that for real values of the parameters, the mathematical model can describe both regular and irregular oscillations, as well as the “mixed-mode” oscillations observed in the experiment. For the first time oscillations with different properties and distinct mechanisms of their occurrence were detected in the same model. It was demonstrated that oscillations occurred as a result of a strong dependence of the reaction rate on the concentration of active sites both due to a variation in the concentration of the surface oxide or the surface carbon.

Sobre autores

M. Slinko

N.N. Semenov Federal Research Center for Chemical Physics RAS

Email: slinko@polymer.chph.ras.ru
Kosygina str. 4, Moscow, 119991 Russia

N. Semendyaeva

Faculty of Computational Mathematics and Cybernetics, Moscow State University; Shenzhen MSU-BIT University, Faculty of Computational Mathematics and Cybernetics

Email: slinko@polymer.chph.ras.ru
Leninskie Goru 1, b. 52, Moscow, 119991 Russia; International University Park Road, Dayun New Town, Longgang District, Shenzhen, 518172 China

A. Makeev

Faculty of Computational Mathematics and Cybernetics, Moscow State University

Email: slinko@polymer.chph.ras.ru
Leninskie Goru 1, b. 52, Moscow, 119991 Russia

V. Bychkov

N.N. Semenov Federal Research Center for Chemical Physics RAS

Autor responsável pela correspondência
Email: slinko@polymer.chph.ras.ru
Kosygina str. 4, Moscow, 119991 Russia

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