®®®® SIIA Público

Título del libro: Ecos 2009 - 22nd International Conference On Efficiency, Cost, Optimization, Simulation And Environmental Impact Of Energy Systems
Título del capítulo: CO2-free production of hydrogen using catalytic thermal decomposition

Autores UNAM:
FEDERICO MENDEZ LAVIELLE; CESAR TREVIÑO TREVIÑO;
Autores externos:

Idioma:
Inglés
Año de publicación:
2009
Palabras clave:

Activation analysis; Activation energy; Carbon dioxide; Conservation; Decomposition; Desorption; Environmental impact; Methane; Pyrolysis; Adsorption and desorptions; Decomposition temperature; Endothermic reactions; Energy conservation equations; Heterogeneous reactions; High activation energy; Production of hydrogen; Stagnation-point flow; Hydrogen production


Resumen:

In this work, a theoretical analysis is developed to predict the decomposition temperature of methane gas, CH4, in a planar stagnation-point flow over a catalytic carbon surface. Hydrogen is produced (without CO2 as a byproduct) by means of a heterogeneous reaction mechanism, which is modeled with five heterogeneous reactions, including adsorption and desorption reactions. The mass species, momentum, and energy conservation equations for the gas phase are solved, taking into account that the temperature of decomposition is characterized by the Damkohler number. Therefore, the critical temperature conditions for the catalytic thermal decomposition are found by using a high activation energy analysis for the desorption kinetics of the adsorbed hydrogen component, Hosp. Specifically, the numerical estimations show that, for increasing values of the velocity gradient associated with the stagnation flow, the temperature of decomposition grows, depending on the surface coverages of the product species. © 2009 by ABCM.


Entidades citadas de la UNAM: