Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts

Titania-supported iron (1wt%) catalysts were prepared by the sol-gel method using different gelation pH (3 and 9), metal precursors (FeCl2 and FeCl3) and calcination temperatures (873 and 1073K). Characterization data of calcined catalysts revealed that in all samples the dominant iron species is Fe...

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Autores: López, Tessi, Pecchi, Gina, Moreno, Abel, García Fierro, José Luis, Gómez, R., Reyes, P.
Tipo de recurso: artículo
Fecha de publicación:2002
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/2189
Acceso en línea:http://hdl.handle.net/10261/2189
Access Level:acceso abierto
Palabra clave:Iron catalysts
Sol-gel
Titanium oxide
Combustion
Methane
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spelling Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 CatalystsLópez, TessiPecchi, GinaMoreno, AbelGarcía Fierro, José LuisGómez, R.Reyes, P.Iron catalystsSol-gelTitanium oxideCombustionMethaneTitania-supported iron (1wt%) catalysts were prepared by the sol-gel method using different gelation pH (3 and 9), metal precursors (FeCl2 and FeCl3) and calcination temperatures (873 and 1073K). Characterization data of calcined catalysts revealed that in all samples the dominant iron species is Fe3+ and the crystalline phase of the TiO2 substrate depends on the gelation pH and the metal precursor used. It was found that in the Fe/TiO2 ex-FeCl3 samples an important part of the iron ions became inserted in titania lattice, which makes the anatase phase stable even at high calcination temperatures. The solids were tested in the combustion of methane under stoichiometric conditions at atmospheric pressure. It was observed that the Fe/TiO2 ex-FeCl2 sample displays the highest activity. This behaviour is explained on the basis of the highest fraction of iron oxide deposited on the external surface of the catalyst particlesSe prepararon catalizadores de hierro soportados sobre titania utilizando el método sol-gel y contenido de metal de 1% en peso. Se utilizaron diferentes pH de gelación (3 y 9), precursores metálicos (FeCl2 y FeCl3) y temperaturas de calcinación (873 y 1073K). Los resultados de caracterización indican que en todos los casos el hierro está presente fundamentalmente como Fe3+ y la fase cristalina de titanio presente depende del pH de gelación y de la naturaleza del precursor utilizado. Se encontró que cuando se usa FeCl3 como precursor de hierro, hay una mayor inserción de iones hierro en la red de la titania que estabiliza a la fase anatasa aún a altas temperaturas de calcinación. Se midió la actividad catalítica de los sólidos preparados en la reacción de combustión de metano en relaciones estequiométricas metano/oxígeno y a presión atmosférica. Los catalizadores preparados a partir de FeCl2 mostraron la mayor actividad. Este comportamiento se explica considerando que en estos catalizadores la mayor parte del hierro se encuentra en la superficie externa del sólido presentando sólo una pequeña fracción de iones hierro insertos en la red de titanio.The authors thank FONDECYT, Grant 1990484 for the financial support.Peer reviewedSociedad Chilena de Química200720072002info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/2189reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/21892026-05-22T06:33:51Z
dc.title.none.fl_str_mv Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts
title Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts
spellingShingle Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts
López, Tessi
Iron catalysts
Sol-gel
Titanium oxide
Combustion
Methane
title_short Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts
title_full Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts
title_fullStr Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts
title_full_unstemmed Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts
title_sort Effect of Chlorine precursor in surface and cataytic properties of Fe/TiO2 Catalysts
dc.creator.none.fl_str_mv López, Tessi
Pecchi, Gina
Moreno, Abel
García Fierro, José Luis
Gómez, R.
Reyes, P.
author López, Tessi
author_facet López, Tessi
Pecchi, Gina
Moreno, Abel
García Fierro, José Luis
Gómez, R.
Reyes, P.
author_role author
author2 Pecchi, Gina
Moreno, Abel
García Fierro, José Luis
Gómez, R.
Reyes, P.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Iron catalysts
Sol-gel
Titanium oxide
Combustion
Methane
topic Iron catalysts
Sol-gel
Titanium oxide
Combustion
Methane
description Titania-supported iron (1wt%) catalysts were prepared by the sol-gel method using different gelation pH (3 and 9), metal precursors (FeCl2 and FeCl3) and calcination temperatures (873 and 1073K). Characterization data of calcined catalysts revealed that in all samples the dominant iron species is Fe3+ and the crystalline phase of the TiO2 substrate depends on the gelation pH and the metal precursor used. It was found that in the Fe/TiO2 ex-FeCl3 samples an important part of the iron ions became inserted in titania lattice, which makes the anatase phase stable even at high calcination temperatures. The solids were tested in the combustion of methane under stoichiometric conditions at atmospheric pressure. It was observed that the Fe/TiO2 ex-FeCl2 sample displays the highest activity. This behaviour is explained on the basis of the highest fraction of iron oxide deposited on the external surface of the catalyst particles
publishDate 2002
dc.date.none.fl_str_mv 2002
2007
2007
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/2189
url http://hdl.handle.net/10261/2189
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Sociedad Chilena de Química
publisher.none.fl_str_mv Sociedad Chilena de Química
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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