Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2

Detalhes bibliográficos
Autor(a) principal: Moura,Flávia C. C.
Data de Publicação: 2007
Outros Autores: Araujo,Maria H., Ardisson,José D., Macedo,Waldemar A. A., Albuquerque,Adriana S., Lago,Rochel M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Journal of the Brazilian Chemical Society (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532007000200012
Resumo: In this work, the reaction of the perovskite LaMnO3.15 with Feº has been promoted by thermal treatment of the mixture Feº/LaMnO3.15 at 200, 400 and 600 ºC. Mössbauer spectroscopy, X-ray diffraction (XRD), temperature programmed reduction (TPR) and temperature programmed desorption (O2-TPD) analyses suggested that at 400 and 600 ºC oxygen from perovskite is transferred to Feº to produce an oxygen deficient perovskite, LaMnO3-d, and highly dispersed iron oxides, mainly Fe3O4 and FeO. XRD lattice parameters and crystallite size showed that LaMnO3 suffers a strong lattice distortion after reaction but no collapse of the perovskite structure. Reactivity studies pointed to a special interface effect of Feº/LaMO3 towards two reactions with H2O2, the decomposition to O2 and the oxidation of the model molecule, the methylene blue dye. As the treatment temperature of the Feº/LaMnO3.15 increased, the activity for H2O2 decomposition decreased, whereas the activity for the dye oxidation increased. These results are discussed in terms of a decrease in the concentration of Mn4+surf and Mn3+surf species, active for the H2O2 decomposition, with the formation of Mn2+surf and Fe2+surf species, active for the Fenton reaction.
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spelling Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2perovskitesiron oxidesFentonMössbauer spectroscopyIn this work, the reaction of the perovskite LaMnO3.15 with Feº has been promoted by thermal treatment of the mixture Feº/LaMnO3.15 at 200, 400 and 600 ºC. Mössbauer spectroscopy, X-ray diffraction (XRD), temperature programmed reduction (TPR) and temperature programmed desorption (O2-TPD) analyses suggested that at 400 and 600 ºC oxygen from perovskite is transferred to Feº to produce an oxygen deficient perovskite, LaMnO3-d, and highly dispersed iron oxides, mainly Fe3O4 and FeO. XRD lattice parameters and crystallite size showed that LaMnO3 suffers a strong lattice distortion after reaction but no collapse of the perovskite structure. Reactivity studies pointed to a special interface effect of Feº/LaMO3 towards two reactions with H2O2, the decomposition to O2 and the oxidation of the model molecule, the methylene blue dye. As the treatment temperature of the Feº/LaMnO3.15 increased, the activity for H2O2 decomposition decreased, whereas the activity for the dye oxidation increased. These results are discussed in terms of a decrease in the concentration of Mn4+surf and Mn3+surf species, active for the H2O2 decomposition, with the formation of Mn2+surf and Fe2+surf species, active for the Fenton reaction.Sociedade Brasileira de Química2007-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532007000200012Journal of the Brazilian Chemical Society v.18 n.2 2007reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532007000200012info:eu-repo/semantics/openAccessMoura,Flávia C. C.Araujo,Maria H.Ardisson,José D.Macedo,Waldemar A. A.Albuquerque,Adriana S.Lago,Rochel M.eng2007-06-13T00:00:00Zoai:scielo:S0103-50532007000200012Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2007-06-13T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
title Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
spellingShingle Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
Moura,Flávia C. C.
perovskites
iron oxides
Fenton
Mössbauer spectroscopy
title_short Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
title_full Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
title_fullStr Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
title_full_unstemmed Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
title_sort Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
author Moura,Flávia C. C.
author_facet Moura,Flávia C. C.
Araujo,Maria H.
Ardisson,José D.
Macedo,Waldemar A. A.
Albuquerque,Adriana S.
Lago,Rochel M.
author_role author
author2 Araujo,Maria H.
Ardisson,José D.
Macedo,Waldemar A. A.
Albuquerque,Adriana S.
Lago,Rochel M.
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Moura,Flávia C. C.
Araujo,Maria H.
Ardisson,José D.
Macedo,Waldemar A. A.
Albuquerque,Adriana S.
Lago,Rochel M.
dc.subject.por.fl_str_mv perovskites
iron oxides
Fenton
Mössbauer spectroscopy
topic perovskites
iron oxides
Fenton
Mössbauer spectroscopy
description In this work, the reaction of the perovskite LaMnO3.15 with Feº has been promoted by thermal treatment of the mixture Feº/LaMnO3.15 at 200, 400 and 600 ºC. Mössbauer spectroscopy, X-ray diffraction (XRD), temperature programmed reduction (TPR) and temperature programmed desorption (O2-TPD) analyses suggested that at 400 and 600 ºC oxygen from perovskite is transferred to Feº to produce an oxygen deficient perovskite, LaMnO3-d, and highly dispersed iron oxides, mainly Fe3O4 and FeO. XRD lattice parameters and crystallite size showed that LaMnO3 suffers a strong lattice distortion after reaction but no collapse of the perovskite structure. Reactivity studies pointed to a special interface effect of Feº/LaMO3 towards two reactions with H2O2, the decomposition to O2 and the oxidation of the model molecule, the methylene blue dye. As the treatment temperature of the Feº/LaMnO3.15 increased, the activity for H2O2 decomposition decreased, whereas the activity for the dye oxidation increased. These results are discussed in terms of a decrease in the concentration of Mn4+surf and Mn3+surf species, active for the H2O2 decomposition, with the formation of Mn2+surf and Fe2+surf species, active for the Fenton reaction.
publishDate 2007
dc.date.none.fl_str_mv 2007-04-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532007000200012
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532007000200012
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50532007000200012
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Journal of the Brazilian Chemical Society v.18 n.2 2007
reponame:Journal of the Brazilian Chemical Society (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
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reponame_str Journal of the Brazilian Chemical Society (Online)
collection Journal of the Brazilian Chemical Society (Online)
repository.name.fl_str_mv Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv ||office@jbcs.sbq.org.br
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