Improvement of thermal stability of highly active species on SiO2supported copper-ceria catalysts

Gonzalo Aguila*, Rafael Calle, Sichem Guerrero, Patricio Baeza, Paulo Araya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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

Original languageEnglish
Pages (from-to)33271-33275
Number of pages5
JournalRSC Advances
Volume11
Issue number53
DOIs
StatePublished - 28 Sep 2021

Bibliographical note

Funding Information:
The authors acknowledge gratefully the nancial support of this work under Fondecyt project 1161227 and PUCV project 039.376.

Publisher Copyright:
© The Royal Society of Chemistry.

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