CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES

Substituted La1-xCe xCoO3 perovskite-type oxides (0.0≤x≤0.9), prepared by the self-combustion method, have been investigated as catalysts in soot combustion. The characterization results indicate modification in the specific surface area, crystal structure, oxygen mobility and re...

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Autores principales:	PECCHI,GINA, MORALES,RUDDY, DELGADO,EDUARDO J, JIMENEZ,ROMEL, FRAGA,MARCO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2014
Materias:	cobalt ceria lanthanum perovskite soot combustion
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072014000400020
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spelling	oai:scielo:S0717-970720140004000202015-01-09CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITESPECCHI,GINAMORALES,RUDDYDELGADO,EDUARDO JJIMENEZ,ROMELFRAGA,MARCO cobalt ceria lanthanum perovskite soot combustion Substituted La1-xCe xCoO3 perovskite-type oxides (0.0≤x≤0.9), prepared by the self-combustion method, have been investigated as catalysts in soot combustion. The characterization results indicate modification in the specific surface area, crystal structure, oxygen mobility and reducibility of cobaltite upon cerium substitution. Cobaltite structure does not tolerate more than 50% substitution of La by Ce. For higher Ce substitution the perovskite structure is lost and mixed oxides are detected. Further destruction of the perovskite structure in a reductive process indicates a lower catalytic role of the perovskite structure in the catalytic combustion of soot regarding to the chemical composition of the La1-xCe xCoO3 system. After the reductive process, only a slight increase in the catalytic activity of the samples with low Ce content (x≤0.3) while a larger increased was detected for those with larger amount of Ce(x≥0.5). These results suggest that the activity of these materials for soot combustion is improved by two factors: i) the increasing of CeO2 content, closely related to higher material capacity for oxygen transfer from catalyst to carbonaceous surface and ii) the formation of larger CeO2 crystals in the higher-Ce-content samples after H2 reduction, responsible of the improvement of the oxygen exchange and number of contact points between catalyst and soot.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.59 n.4 20142014-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072014000400020en10.4067/S0717-97072014000400020
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	cobalt ceria lanthanum perovskite soot combustion
spellingShingle	cobalt ceria lanthanum perovskite soot combustion PECCHI,GINA MORALES,RUDDY DELGADO,EDUARDO J JIMENEZ,ROMEL FRAGA,MARCO CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES
description	Substituted La1-xCe xCoO3 perovskite-type oxides (0.0≤x≤0.9), prepared by the self-combustion method, have been investigated as catalysts in soot combustion. The characterization results indicate modification in the specific surface area, crystal structure, oxygen mobility and reducibility of cobaltite upon cerium substitution. Cobaltite structure does not tolerate more than 50% substitution of La by Ce. For higher Ce substitution the perovskite structure is lost and mixed oxides are detected. Further destruction of the perovskite structure in a reductive process indicates a lower catalytic role of the perovskite structure in the catalytic combustion of soot regarding to the chemical composition of the La1-xCe xCoO3 system. After the reductive process, only a slight increase in the catalytic activity of the samples with low Ce content (x≤0.3) while a larger increased was detected for those with larger amount of Ce(x≥0.5). These results suggest that the activity of these materials for soot combustion is improved by two factors: i) the increasing of CeO2 content, closely related to higher material capacity for oxygen transfer from catalyst to carbonaceous surface and ii) the formation of larger CeO2 crystals in the higher-Ce-content samples after H2 reduction, responsible of the improvement of the oxygen exchange and number of contact points between catalyst and soot.
author	PECCHI,GINA MORALES,RUDDY DELGADO,EDUARDO J JIMENEZ,ROMEL FRAGA,MARCO
author_facet	PECCHI,GINA MORALES,RUDDY DELGADO,EDUARDO J JIMENEZ,ROMEL FRAGA,MARCO
author_sort	PECCHI,GINA
title	CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES
title_short	CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES
title_full	CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES
title_fullStr	CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES
title_full_unstemmed	CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES
title_sort	catalytic combustion of soot on ce-doped lanthanum cobaltites
publisher	Sociedad Chilena de Química
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072014000400020
work_keys_str_mv	AT pecchigina catalyticcombustionofsootoncedopedlanthanumcobaltites AT moralesruddy catalyticcombustionofsootoncedopedlanthanumcobaltites AT delgadoeduardoj catalyticcombustionofsootoncedopedlanthanumcobaltites AT jimenezromel catalyticcombustionofsootoncedopedlanthanumcobaltites AT fragamarco catalyticcombustionofsootoncedopedlanthanumcobaltites
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CATALYTIC COMBUSTION OF SOOT ON Ce-DOPED LANTHANUM COBALTITES

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