THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2O

ABSTRACT The effect of the support on the formation of the Cu-CeO2 interface and its thermal stability after calcination at 500, 700 and 900 °C is studied. The supports used are SiO2, because of its inert character, and A2O3, because it can interact with the Cu and Ce species on the surface. The cat...

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Autores principales:	Alvarez,Pablo, Aguila,Gonzalo, Guerrero,Sichem, Araya,Paulo
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2018
Materias:	Cu Ce silica alumina CO oxidation N2O decomposition
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072018000304102
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spelling	oai:scielo:S0717-970720180003041022018-10-03THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2OAlvarez,PabloAguila,GonzaloGuerrero,SichemAraya,Paulo Cu Ce silica alumina CO oxidation N2O decomposition ABSTRACT The effect of the support on the formation of the Cu-CeO2 interface and its thermal stability after calcination at 500, 700 and 900 °C is studied. The supports used are SiO2, because of its inert character, and A2O3, because it can interact with the Cu and Ce species on the surface. The catalysts were characterized by BET, XRD, UV-vis DRS, and TPR with H2. The catalytic activity in the CO oxidation reactions with O2 at low temperature and the decomposition of N2O were selected to visualize the effect of temperature on the concentration of Cu-CeO2 interfacial sites. The results show that at a calcination temperature of 500 °C the formation of the Cu-CeO2 interface is favored over the SiO2 support. However, the stability of the Cu-CeO2 interface on SiO2 is much lower than on Al2O3, causing a substantial decrease of the interfacial sites calcining at 700 °C, and segregation of the Cu and Ce species on the surface of the silica, with complete loss of the catalytic activity in both reactions when calcining at 900 °C. In contrast, on alumina the Cu-CeO2 interface is more stable and presents a significant catalytic activity in both reactions, even when calcining at 900 °C. The characterization results show that the sintering process of Cu species and CeO2 particles is less on the alumina support due to the greater interaction of the Cu and Ce with this support.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.63 n.3 20182018-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072018000304102en10.4067/s0717-97072018000304102
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Cu Ce silica alumina CO oxidation N2O decomposition
spellingShingle	Cu Ce silica alumina CO oxidation N2O decomposition Alvarez,Pablo Aguila,Gonzalo Guerrero,Sichem Araya,Paulo THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2O
description	ABSTRACT The effect of the support on the formation of the Cu-CeO2 interface and its thermal stability after calcination at 500, 700 and 900 °C is studied. The supports used are SiO2, because of its inert character, and A2O3, because it can interact with the Cu and Ce species on the surface. The catalysts were characterized by BET, XRD, UV-vis DRS, and TPR with H2. The catalytic activity in the CO oxidation reactions with O2 at low temperature and the decomposition of N2O were selected to visualize the effect of temperature on the concentration of Cu-CeO2 interfacial sites. The results show that at a calcination temperature of 500 °C the formation of the Cu-CeO2 interface is favored over the SiO2 support. However, the stability of the Cu-CeO2 interface on SiO2 is much lower than on Al2O3, causing a substantial decrease of the interfacial sites calcining at 700 °C, and segregation of the Cu and Ce species on the surface of the silica, with complete loss of the catalytic activity in both reactions when calcining at 900 °C. In contrast, on alumina the Cu-CeO2 interface is more stable and presents a significant catalytic activity in both reactions, even when calcining at 900 °C. The characterization results show that the sintering process of Cu species and CeO2 particles is less on the alumina support due to the greater interaction of the Cu and Ce with this support.
author	Alvarez,Pablo Aguila,Gonzalo Guerrero,Sichem Araya,Paulo
author_facet	Alvarez,Pablo Aguila,Gonzalo Guerrero,Sichem Araya,Paulo
author_sort	Alvarez,Pablo
title	THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2O
title_short	THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2O
title_full	THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2O
title_fullStr	THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2O
title_full_unstemmed	THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2O
title_sort	thermal stability of the cu-ceo2 interface on silica and alumina, and its relation with activity in the oxidation reaction of co and the decomposition of n2o
publisher	Sociedad Chilena de Química
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072018000304102
work_keys_str_mv	AT alvarezpablo thermalstabilityofthecuceo2interfaceonsilicaandaluminaanditsrelationwithactivityintheoxidationreactionofcoandthedecompositionofn2o AT aguilagonzalo thermalstabilityofthecuceo2interfaceonsilicaandaluminaanditsrelationwithactivityintheoxidationreactionofcoandthedecompositionofn2o AT guerrerosichem thermalstabilityofthecuceo2interfaceonsilicaandaluminaanditsrelationwithactivityintheoxidationreactionofcoandthedecompositionofn2o AT arayapaulo thermalstabilityofthecuceo2interfaceonsilicaandaluminaanditsrelationwithactivityintheoxidationreactionofcoandthedecompositionofn2o
_version_	1714200929388986368

THERMAL STABILITY OF THE Cu-CeO2 INTERFACE ON SILICA AND ALUMINA, AND ITS RELATION WITH ACTIVITY IN THE OXIDATION REACTION OF CO AND THE DECOMPOSITION OF N2O

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