STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHOD

Perovskites are very thermally stable mixed oxides, frequently used as oxidation catalysts in spite of their relatively low surface area. In order to increase the area the sol-gel method has been used, with malic acid as complexing agent and pH adjustment of the starting solution, to prepare the LaC...

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Autores principales:	BOUYSSIÉRES,LILIAN, SCHIFFERLI,RENÉ, URBINA,LORETO, ARAYA,PAULO, PALACIOS,JOSÉ MARIA
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2005
Materias:	perovskites CO oxidation perovskite preparation sol-gel method
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072005000100007
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spelling	oai:scielo:S0717-970720050001000072005-05-27STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHODBOUYSSIÉRES,LILIANSCHIFFERLI,RENÉURBINA,LORETOARAYA,PAULOPALACIOS,JOSÉ MARIA perovskites CO oxidation perovskite preparation sol-gel method Perovskites are very thermally stable mixed oxides, frequently used as oxidation catalysts in spite of their relatively low surface area. In order to increase the area the sol-gel method has been used, with malic acid as complexing agent and pH adjustment of the starting solution, to prepare the LaCoO3 perovskite, used as a reference, and other perovskites in which the La cation has been partially replaced (20% molar) by Ca, Sr or Ba cations. Additionally, the cooling rate of the fresh catalysts, from the calcination temperature to room temperature, has been used as a parameter in the method of preparation. The catalysts were characterized by BET area, DRX, TG, DTA, and SEM-EDX. Catalytic activity was tested in a fixed bed flow reactor using the oxidation of CO with O2 reaction. The DRX studies confirmed the presence of a single phase with perovskite structure in the catalysts calcined at 550 C, and the additional studies confirmed that very uniform catalysts with great thermal stability were obtained. Substitution of La by group II cations and the method of preparation make it possible to obtain perovskites with large surface area and excellent catalytic activity for CO oxidation, reaching maximum conversion values, close to 100%, at temperatures of about 200 C. Changes in post-calcination cooling rate did not produce significant changes in the surface area or in the catalytic activity of the catalysts, except when Ba-substituted catalysts were usedinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.50 n.1 20052005-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072005000100007en10.4067/S0717-97072005000100007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	perovskites CO oxidation perovskite preparation sol-gel method
spellingShingle	perovskites CO oxidation perovskite preparation sol-gel method BOUYSSIÉRES,LILIAN SCHIFFERLI,RENÉ URBINA,LORETO ARAYA,PAULO PALACIOS,JOSÉ MARIA STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHOD
description	Perovskites are very thermally stable mixed oxides, frequently used as oxidation catalysts in spite of their relatively low surface area. In order to increase the area the sol-gel method has been used, with malic acid as complexing agent and pH adjustment of the starting solution, to prepare the LaCoO3 perovskite, used as a reference, and other perovskites in which the La cation has been partially replaced (20% molar) by Ca, Sr or Ba cations. Additionally, the cooling rate of the fresh catalysts, from the calcination temperature to room temperature, has been used as a parameter in the method of preparation. The catalysts were characterized by BET area, DRX, TG, DTA, and SEM-EDX. Catalytic activity was tested in a fixed bed flow reactor using the oxidation of CO with O2 reaction. The DRX studies confirmed the presence of a single phase with perovskite structure in the catalysts calcined at 550 C, and the additional studies confirmed that very uniform catalysts with great thermal stability were obtained. Substitution of La by group II cations and the method of preparation make it possible to obtain perovskites with large surface area and excellent catalytic activity for CO oxidation, reaching maximum conversion values, close to 100%, at temperatures of about 200 C. Changes in post-calcination cooling rate did not produce significant changes in the surface area or in the catalytic activity of the catalysts, except when Ba-substituted catalysts were used
author	BOUYSSIÉRES,LILIAN SCHIFFERLI,RENÉ URBINA,LORETO ARAYA,PAULO PALACIOS,JOSÉ MARIA
author_facet	BOUYSSIÉRES,LILIAN SCHIFFERLI,RENÉ URBINA,LORETO ARAYA,PAULO PALACIOS,JOSÉ MARIA
author_sort	BOUYSSIÉRES,LILIAN
title	STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHOD
title_short	STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHOD
title_full	STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHOD
title_fullStr	STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHOD
title_full_unstemmed	STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHOD
title_sort	study of perovskites obtained by the sol-gel method
publisher	Sociedad Chilena de Química
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072005000100007
work_keys_str_mv	AT bouyssiereslilian studyofperovskitesobtainedbythesolgelmethod AT schifferlirene studyofperovskitesobtainedbythesolgelmethod AT urbinaloreto studyofperovskitesobtainedbythesolgelmethod AT arayapaulo studyofperovskitesobtainedbythesolgelmethod AT palaciosjosemaria studyofperovskitesobtainedbythesolgelmethod
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STUDY OF PEROVSKITES OBTAINED BY THE SOL-GEL METHOD

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