Abstract: Previous study suggested that work in a cyclic regime with alternating CH4 – O2/N2 – CH4 switches can increase the duration of operation of Pt/Mg-Al-O catalysts at 600◦C with close to highest C2-C3 hydrocarbons productivity. In this work, a kinetic model was developed that describes the dynamics of reaction products and coke accumulation. In particular, the model accounts for substantial dependence of the quantity of C2-C3 products formed at repeated CH4 feeding after catalyst treatment in N2 on the reaction duration on pre-reduced catalyst. Such quantity can be even higher than at continuous reaction run. It is determined by the completeness of the support occupation by strongly adsorbed CH3 fragments migrating from the Pt active sites, rate of hydrogen spillover from the support to Pt in the absence of CH4 and concentration of inactive adsorbed [CHx]Pt (x = 0, 1) species be hydrogenated by [H]Pt.

Cite: Pinaeva L.G. , Sadovskaya E.M. , Petrov R.V. , Noskov A.S.
Kinetic Study of non-Oxidative Methane Coupling on Pt/Mg-Al-O Catalysts
Journal of Environmental Chemical Engineering. 2025. V.13. N6. 120291 :1-9. DOI: 10.1016/j.jece.2025.120291

Dates:

Submitted:	Jun 20, 2025
Accepted:	Nov 12, 2025
Published online:	Nov 13, 2025
Published print:	Dec 1, 2025

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