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
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , |
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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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 |
_version_ |
1815439058639257600 |