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

Abstract

Abstract:In this work, we analyze the heterogeneous conversion process of hydrogen sulfide acid, H 2 S , to atomic hydrogen, H 0 , 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 H 2 S and H 0 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 H 0 , together with the surface coverage of the vacancies derived from the chemical and electrochemical reactions are presented.