NDLI: Effect of the Calcination Atmosphere on the Structural Properties of the Reduced Fe/SiO2 System

Content Provider	Springer Nature Link
Author	Alvarez, A. M. Bengoa, J. F. Cagli, M. V. Gallegos, N. G. Marchetti, S. G. Mercader, R. C.
Copyright Year	2005
Abstract	Iron supported systems are frequently used as catalysts in the Fischer–Tropsch synthesis being the Fe0 the active phase for the reaction. We have studied the influence of the calcination atmosphere (air or nitrogen) on the iron oxide reducibility and the metallic iron particle size obtained in Fe/SiO2 system. We have impregnated a silicagel with Fe(NO3)3·9H2O aqueous solution and the solid obtained was calcinated in air or N2 stream. These precursors, with 5% (wt/wt) of Fe, were characterized by Mössbauer Spectroscopy at 298 and 15 K. Amorphous Fe2O3 species with 3 nm diameter in the former, and α-Fe2O3 crystals of 48 nm diameter were detected in the last one. Both precursors were reduced in H2 stream. Two catalysts were obtained and characterized by Mössbauer spectroscopy in controlled atmosphere at 298 and 15 K, CO chemisorption and volumetric oxidation. α-Fe0, Fe3O4 and Fe2+ were identified in the catalyst calcined in air. Instead, only α-Fe0 was detected in the catalyst calcined in N2. The iron metallic crystal sizes were estimated as ≈2 nm for the former and ≈29 nm for the last one. The different oxide crystal sizes, obtained from the diverse calcination atmospheres, have led to different structural properties of the reduced solids. It has been possible to reduce totally the existing iron in an Fe/SiO2 system with iron loading lower than 10% (wt/wt).
Starting Page	3
Ending Page	9
Page Count	7
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	161
Issue Number	1-4
e-ISSN	15729540
Language	English
Publisher	Springer Netherlands
Publisher Date	2005-12-03
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Surfaces and Interfaces, Thin Films Condensed Matter Atoms, Molecules, Clusters and Plasmas Nuclear Physics, Heavy Ions, Hadrons
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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