Improvement of thermal stability of highly active species on SiO2supported copper-ceria catalysts
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Fecha
2021-09-28
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Royal Society of Chemistry
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Licencia CC
Attribution 3.0 Unported
CC BY 3.0
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Licencia CC
https://creativecommons.org/licenses/by/3.0/
Resumen
CuO-CeO2/SiO2 catalysts lose activity when they are calcined at 600 °C and temperatures above. This loss of activity was related to a decrease in the amount of highly dispersed Cu species interacting with Ce (CuO-CeO2 interface) over the SiO2 support. These species are highly active in CO oxidation, so this reaction was selected to conduct this study. In order to avoid the activity loss in CuO-CeO2/SiO2 catalysts, the effect of high Ce loads (8, 16, 24, and 36%) on the thermal stability of these catalysts was studied. The results reveal that when increasing calcination temperature from 500 to 700 °C, the catalysts with Ce load equal to or higher than 24% increase the formation of highly dispersed Cu interacting with Ce and therefore the activity (90% of CO conversion at 120 °C). In catalysts with Ce load below 24%, Cu species agglomerate and decrease the activity (less than 5% of CO conversion at 120 °C). This journal is © The Royal Society of Chemistry.
Notas
Indexación: Scopus.
Palabras clave
Calcination, Catalyst activity, Cerium, Cerium oxide, Copper, Copper oxides, Thermodynamic stability
Citación
RSC Advances, Volume 11, Issue 53, Pages 33271 - 33275, 28 September 2021
DOI
10.1039/d1ra06204b