Buscar

 

RI UFLA (Universidade Federal de Lavras) >
DCA - Departamento de Ciência dos Alimentos >
DCA - Artigos publicados em periódicos >

Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/4774

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
???metadata.dc.creator???: Nunes, C. A.
Resende, E. C.
Aes, I. G.
Anastácio, A. S.
Guerreiro, M. C.
Keywords: 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
Publisher: Society for Applied Spectroscopy
Issue Date: 1-Mar-2011
Citation: 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.
Abstract: 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)).
URI: http://www.ncbi.nlm.nih.gov/pubmed/21639992
http://repositorio.ufla.br/jspui/handle/1/4774
???metadata.dc.language???: en
Appears in Collections:DCA - Artigos publicados em periódicos

Files in This Item:

There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.


View Statistics

 


DSpace Software Copyright © 2002-2010  Duraspace - Feedback