Publicación:
CeαMn1-αO2 CATALYSTS SUPPORTED over g-Al2O3 PREPARED by MODIFIED REDOX-COPRECIPITATION METHODS for n-HEXANE COMBUSTION
CeαMn1-αO2 CATALYSTS SUPPORTED over g-Al2O3 PREPARED by MODIFIED REDOX-COPRECIPITATION METHODS for n-HEXANE COMBUSTION
No hay miniatura disponible
Fecha
2020
Autores
Quispe J.R.
Cruz R.
Kou R.S.
Picasso G.
Título de la revista
Revista ISSN
Título del volumen
Editor
Sociedade Brasileira de Quimica
Proyectos de investigación
Unidades organizativas
Número de la revista
Abstracto
A series of CeαMn1-αO2 catalysts supported on g-alumina with various molar concentrations of Ce (α, from 0 to 0.90) was synthesized by coprecipitation, applying two different precipitating agents, namely, sodium hydroxide (method 1) and sodium carbonate (method 2), with the use of sodium permanganate as a redox agent for precipitation. XRD profiles of the supported samples revealed the predominant abundance of a typical fluorite crystalline structure. TPR thermograms of supported samples were displaced towards lower temperatures with increasing Mn concentration, in contrast with the bulk samples. The supported Ce-Mn samples exhibited a greater performance in n-hexane elimination than did the corresponding simple oxides. The sample Ce0.33Mn0.67O2 obtained by method 2 presented the best activity, probably due to the enrichment of Ce4+, Mn3+ and Mn4+ surface species, an excess of superficial oxygen species and an easy reducibility as well as the lowest apparent activation energy.
Descripción
Palabras clave
VOC,
Alumina,
Ce-Mn,
Modified-precipitation,
N-hexane