Investigation of the solid state reaction of LaMnO3 with Feº and its effect on the catalytic reactions with H2O2
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , , , |
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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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 |
institution |
SBQ |
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 |
_version_ |
1750318167809327104 |