Heterogeneous Decomposition of a Hydrogen Sulfide-Methane Sour Mixture Flowing in a Rectangular Channel

J. C. Martínez1, F. Méndez*, 2, C. Treviño3
1 Facultad de Ingeniería, Universidad Autónoma de Campeche 24030 Campeche, Mexico
2 Facultad de Ingeniería, Universidad Nacional Autónoma de México 04510 México DF, Mexico
3 Facultad de Ciencias, Universidad Nacional Autónoma de México 04510 México DF, Mexico

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© 2008 Méndez et al.; Licensee Bentham Open

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Facultad de Ingeniería, Universidad Nacional Autónoma de México 04510 México DF, Mexico; Tel: +52-55-56228103; Fax: +52-55-56228106; E-mail:


In this work, we analyze the heterogeneous conversion process of hydrogen sulfide acid, H2S, to atomic hydrogen, H0 , in a binary gas mixture composed by the above acid component and methane gas. We consider that the sour mixture flows in a horizontal rectangular channel under a laminar, hydrodynamically fully-developed flow regime and the decomposition process takes place on the internal walls of the channel made by iron. The heterogeneous chemical activity on the metallic walls is conducted by a reactive scheme based on four reactions: one adsorption, two electrochemical, and an exothermic reaction needed to complete the conversion process. The longitudinal profiles of the species H2S and H0 on the surfaces of the channel as functions of the nondimensional parameters involved in the present model, are shown. In addition, the surface coverages of the chemical products HS , H+ and H0 , together with the surface coverage of the vacancies derived from the chemical and electrochemical reactions are presented.

Keywords: Adsorption, Laminar flow, Electrochemistry, Hydrogen Sulfide, Heterogeneous reactions, Corrosion.