Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications
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Título: | Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications |
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Autor/es: | Giménez-Mañogil, Javier | Garcia-Garcia, Avelina |
Grupo/s de investigación o GITE: | Materiales Carbonosos y Medio Ambiente |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | Soot combustion kinetics | NO2 | Activation energy | Copper/ceria–zirconia | Platinum-based catalyst | Active oxygen |
Área/s de conocimiento: | Química Inorgánica |
Fecha de publicación: | ene-2015 |
Editor: | Elsevier |
Cita bibliográfica: | Fuel Processing Technology. 2015, 129: 227-235. doi:10.1016/j.fuproc.2014.09.018 |
Resumen: | The aim of this paper is to study the activities of ceria–zirconia and copper/ceria–zirconia catalysts, comparing with a commercial platinum/alumina catalyst, for soot combustion reaction under different gas atmospheres and loose contact mode (simulating diesel exhaust conditions), in order to analyse the kinetics and to deduce mechanistic implications. Activity tests were performed under isothermal and TPR conditions. The NO oxidation to NO2 was studied as well. It was checked that mass transfer limitations were not influencing the rate measurements. Global activation energies for the catalysed and non-catalysed soot combustion were calculated and properly discussed. The results reveal that ceria-based catalysts greatly enhance their activities under NOx/O2 between 425 °C and 450 °C, due to the “active oxygen”-assisted soot combustion. Remarkably, copper/ceria–zirconia shows a slightly higher soot combustion rate than the Pt-based catalyst (under NOx/O2, at 450 °C). |
Patrocinador/es: | The authors gratefully acknowledge the financial support of Generalitat Valenciana (PROMETEOII/2014/010 project) and the Spanish Ministry of Economy and Competitiveness (CTQ2012-30703 project, UE-FEDER funding). |
URI: | http://hdl.handle.net/10045/57889 |
ISSN: | 0378-3820 (Print) | 1873-7188 (Online) |
DOI: | 10.1016/j.fuproc.2014.09.018 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2014 Elsevier B.V. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.fuproc.2014.09.018 |
Aparece en las colecciones: | INV - MCMA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2015_Gimenez_Garcia_FPT_final.pdf | Versión final (acceso restringido) | 1,02 MB | Adobe PDF | Abrir Solicitar una copia |
2015_Gimenez_Garcia_FPT_preprint.pdf | Preprint (acceso abierto) | 622,84 kB | Adobe PDF | Abrir Vista previa |
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