Mössbauer and XPS spectroscopies studies of SMSI effect on Fe/Nb2O5 catalysts for the Fischer-Tropsch synthesis

Mössbauer and XPS spectroscopies studies of SMSI effect on Fe/Nb2O5 catalysts for the Fischer-Tropsch synthesis

In order to study if the SMSI effect produces benefitial results on the Fischer-Tropsch (FT) reaction using the Fe/Nb2O5 system we prepared two catalysts by reduction at two different temperatures. The solids were characterized by Mossbauer spectroscopy, XRD, XPS, N2 adsorption, atomic absorption, C...

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Bibliographic Details
Published in:Applied catalysis. A, General Vol. 326; no. 1; pp. 113 - 119
Main Authors: CAGNOLI, M. V, ALVAREZ, A. M, GALLEGOS, N. G, BENGOA, J. F, DUARTE DE SOUZA, C. D, SCHMAL, M, MARCHETTI, S. G
Format: Journal Article
Language:English
Published: Amsterdam Elsevier 30-06-2007
Subjects:
Catalysis
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Fe/Nb2O5 catalysts
Fischer Tropsch synthesis
Iron
X ray
Moessbauer spectrometry
Supported catalyst
Heterogeneous catalysis
SMSI effect
Fischer-Tropsch synthesis
Niobium Oxides
Mössbauer spectroscopy
Photoelectron spectrometry
Catalyst
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Summary:In order to study if the SMSI effect produces benefitial results on the Fischer-Tropsch (FT) reaction using the Fe/Nb2O5 system we prepared two catalysts by reduction at two different temperatures. The solids were characterized by Mossbauer spectroscopy, XRD, XPS, N2 adsorption, atomic absorption, CO chemisorption and volumetric oxidation. It was demonstrated that the support is partially reduced leading to a covering of the Fe deg crystals by NbOx species. At the higher reduction temperature studied (773K) this effect produced a very important activity decrease, an increase in methane production and a shift of the product distribution towards to higher molecular weight hydrocarbons.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2007.04.005