In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods

Detalhes bibliográficos
Autor(a) principal: Nunes, C. A.
Data de Publicação: 2011
Outros Autores: Resende, E. C., Aes, I. G., Anastácio, A. S., Guerreiro, M. C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://www.ncbi.nlm.nih.gov/pubmed/21639992
http://repositorio.ufla.br/jspui/handle/1/4774
Resumo: A goethite-based catalyst was evaluated using in-situ X-ray absorption near-edge structure (XANES) spectroscopy during methane oxidation under increasing reaction temperature. Determination of rank by median absolute deviation (DRMAD), evolving factor analysis (EFA), and multivariate curve resolution (MCR) were used to detect the species present in the catalyst during the reaction and determine their concentration profiles and their pure spectra. The reactants and reaction products were monitored on-line by mass spectrometer. The goethite-based catalyst was active for methane oxidation, with CO(2) and H(2)O as the main products. DRMAD and EFA were useful to determine the number of chemical species present in the catalyst structure during reactions. The catalyst presented phase transition during the reaction from goethite to maghemite according to XANES spectra determined by MCR. On the other hand, it was verified that the catalyst presented phase transition from goethite to wüstite in the process in the absence of the oxidant (O(2)).
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spelling In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methodsGoethiteMethane oxidationX-ray absorption near-edgestructure spectroscopyXANES spectroscopyChemometricsDetermination of rank by median absolute deviationDRMADEvolving factor analysisEFAMultivariate curve resolutionMCRA goethite-based catalyst was evaluated using in-situ X-ray absorption near-edge structure (XANES) spectroscopy during methane oxidation under increasing reaction temperature. Determination of rank by median absolute deviation (DRMAD), evolving factor analysis (EFA), and multivariate curve resolution (MCR) were used to detect the species present in the catalyst during the reaction and determine their concentration profiles and their pure spectra. The reactants and reaction products were monitored on-line by mass spectrometer. The goethite-based catalyst was active for methane oxidation, with CO(2) and H(2)O as the main products. DRMAD and EFA were useful to determine the number of chemical species present in the catalyst structure during reactions. The catalyst presented phase transition during the reaction from goethite to maghemite according to XANES spectra determined by MCR. On the other hand, it was verified that the catalyst presented phase transition from goethite to wüstite in the process in the absence of the oxidant (O(2)).Society for Applied Spectroscopy2014-12-04T17:20:11Z2014-12-04T17:20:11Z2011-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleNUNES, C. A. et al . In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods. Applied Spectroscopy, Baltimore, v. 65, n. 6, p. 692-697, June 2011.http://www.ncbi.nlm.nih.gov/pubmed/21639992http://repositorio.ufla.br/jspui/handle/1/4774Applied Spectroscopyreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLANunes, C. A.Resende, E. C.Aes, I. G.Anastácio, A. S.Guerreiro, M. C.info:eu-repo/semantics/openAccesseng2014-12-04T17:20:11Zoai:localhost:1/4774Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2014-12-04T17:20:11Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods
title In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods
spellingShingle In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods
Nunes, C. A.
Goethite
Methane oxidation
X-ray absorption near-edgestructure spectroscopy
XANES spectroscopy
Chemometrics
Determination of rank by median absolute deviation
DRMAD
Evolving factor analysis
EFA
Multivariate curve resolution
MCR
title_short In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods
title_full In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods
title_fullStr In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods
title_full_unstemmed In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods
title_sort In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods
author Nunes, C. A.
author_facet Nunes, C. A.
Resende, E. C.
Aes, I. G.
Anastácio, A. S.
Guerreiro, M. C.
author_role author
author2 Resende, E. C.
Aes, I. G.
Anastácio, A. S.
Guerreiro, M. C.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Nunes, C. A.
Resende, E. C.
Aes, I. G.
Anastácio, A. S.
Guerreiro, M. C.
dc.subject.por.fl_str_mv Goethite
Methane oxidation
X-ray absorption near-edgestructure spectroscopy
XANES spectroscopy
Chemometrics
Determination of rank by median absolute deviation
DRMAD
Evolving factor analysis
EFA
Multivariate curve resolution
MCR
topic Goethite
Methane oxidation
X-ray absorption near-edgestructure spectroscopy
XANES spectroscopy
Chemometrics
Determination of rank by median absolute deviation
DRMAD
Evolving factor analysis
EFA
Multivariate curve resolution
MCR
description A goethite-based catalyst was evaluated using in-situ X-ray absorption near-edge structure (XANES) spectroscopy during methane oxidation under increasing reaction temperature. Determination of rank by median absolute deviation (DRMAD), evolving factor analysis (EFA), and multivariate curve resolution (MCR) were used to detect the species present in the catalyst during the reaction and determine their concentration profiles and their pure spectra. The reactants and reaction products were monitored on-line by mass spectrometer. The goethite-based catalyst was active for methane oxidation, with CO(2) and H(2)O as the main products. DRMAD and EFA were useful to determine the number of chemical species present in the catalyst structure during reactions. The catalyst presented phase transition during the reaction from goethite to maghemite according to XANES spectra determined by MCR. On the other hand, it was verified that the catalyst presented phase transition from goethite to wüstite in the process in the absence of the oxidant (O(2)).
publishDate 2011
dc.date.none.fl_str_mv 2011-03-01
2014-12-04T17:20:11Z
2014-12-04T17:20:11Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv NUNES, C. A. et al . In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods. Applied Spectroscopy, Baltimore, v. 65, n. 6, p. 692-697, June 2011.
http://www.ncbi.nlm.nih.gov/pubmed/21639992
http://repositorio.ufla.br/jspui/handle/1/4774
identifier_str_mv NUNES, C. A. et al . In-situ monitoring of the structure of a goethite-based catalyst during methane oxidation by X-ray absorption near-edge structure (XANES) spectroscopy assisted by chemometric methods. Applied Spectroscopy, Baltimore, v. 65, n. 6, p. 692-697, June 2011.
url http://www.ncbi.nlm.nih.gov/pubmed/21639992
http://repositorio.ufla.br/jspui/handle/1/4774
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Society for Applied Spectroscopy
publisher.none.fl_str_mv Society for Applied Spectroscopy
dc.source.none.fl_str_mv Applied Spectroscopy
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
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