Studies on reduction dynamics of nickel atoms incorporated in MCM-41 by XANES with two-dimensional correlation spectroscopy approaches

Nascimento, Melke Augusto do; Paskocimas, Carlos Alberto; Silva, Arilson José do Nascimento; Ambrosio, Renato Canha

Studies on reduction dynamics of nickel atoms incorporated in MCM-41 by XANES with two-dimensional correlation spectroscopy approaches

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dc.contributor.author	Nascimento, Melke Augusto do
dc.contributor.author	Paskocimas, Carlos Alberto
dc.contributor.author	Silva, Arilson José do Nascimento
dc.contributor.author	Ambrosio, Renato Canha
dc.date.accessioned	2021-04-16T17:52:54Z
dc.date.available	2021-04-16T17:52:54Z
dc.date.issued	2007-03-05
dc.description.resumo	The reduction kinetics of Ni cations incorporated in MCM-41 was investigated by in situ XANES measurements performed at a dispersive beamline. The detailed analysis of XANES spectra was conducted by perturbationcorrelation moving-window 2D correlation spectroscopy (PCMW2D) and generalized 2D correlation spectroscopy (2DCORA) formalisms. PCMW2D results showed important changes on white-line intensities associated with water desorption and dehydroxilation during the heating process. PCMW2D successfully located the onset of nickel reduction during H2-TPR and characterized the pattern of changes on white-line and preedge intensities from rapid to gradual. The contributive character of progressive 2D correlation analysis calculations induced neglecting of variations on rate of spectral feature changes. To circumvent this limitation, we employed an alternative approach, calculating contributions to the 2D correlation function using a subset of spectra to take into account the temporal complexity structure of in situ collected data. The results show that the Ni reduction is a dynamic process in which the rate of spectral variations changes as the reaction progresses	pt_BR
dc.identifier.citation	NASCIMENTO, Melke A. do; PASKOCIMAS, Carlos A.; SILVA, Arilson J. N.; AMBROSIO, Renato C.. Studies on Reduction Dynamics of Nickel Atoms Incorporated in MCM-41 by XANES with Two-Dimensional Correlation Spectroscopy Approaches. The Journal of Physical Chemistry C, [S.L.], v. 111, n. 18, p. 6813-6820, maio 2007. Disponível em: https://pubs.acs.org/doi/10.1021/jp070574r. Acesso em: 12 mar. 2021 http://dx.doi.org/10.1021/jp070574r.	pt_BR
dc.identifier.issn	10.1021/jp070574r
dc.identifier.issn	1388-6150
dc.identifier.issn	1572-8943
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/32256
dc.language	en	pt_BR
dc.publisher	American Chemical Society	pt_BR
dc.rights	Attribution-NonCommercial 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc/3.0/br/	*
dc.subject	X-ray absorption near edge spectroscopy	pt_BR
dc.subject	Redox reactions	pt_BR
dc.subject	Energy	pt_BR
dc.subject	Electron correlation	pt_BR
dc.subject	Nickel	pt_BR
dc.title	Studies on reduction dynamics of nickel atoms incorporated in MCM-41 by XANES with two-dimensional correlation spectroscopy approaches	pt_BR
dc.type	article	pt_BR