By J. Van De Loosdrecht, P. J. Van Berge, M. W. J. Crajé, A. M. Van Der Kraan (auth.), Desmond C. Cook, Gilbert R. Hoy (eds.)
ISIAME 2000 used to be geared up by way of the Condensed subject and fabrics Physics study workforce at outdated Dominion collage, Norfolk, Virginia. It introduced jointly a global crew of study scientists and engineers from academia and to offer information of the latest investigations on industrially comparable themes and tasks utilizing Mössbauer Spectroscopy as a chief analytical process. those complaints inciude the papers provided below the extensive issues of Chemistry, Surfaces, fabrics Processing, commercial Processing, and Magnetic and digital fabrics. particular learn components drawing a lot curiosity comprise corrosion, catalysis, mechanical alloying, petrochemical, metal and mineralogical processing, nano-phase fabrics and environmental and pollutants tracking.
The ebook is of specific curiosity to school researchers and a truly large variety of business R&D teams who wish to increase their wisdom of the most recent purposes and techniques of hugely resolved spectroscopic research in their items.
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Extra info for Industrial Applications of the Mössbauer Effect: Proceedings of ISIAME 2000 held in Virginia Beach, USA, 13–18 August 2000
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A small part of Fe(IT) species is obviously not reoxidized. This phenomenon reminds of the resistance to oxidation of Fe(II) cations occupying hidden sites in zeolites inaccessible to oxygen. Similar reasons may account for the limited oxidizability of iron(ll) in MCM41. Nevertheless, the reduction/reoxidation cycle has to be regarded as reversible since the reoxidized Fe(III) species can be reduced again to the ferrous state. In the present study direct experimental proves are presented for the coexistence of iron in different oxidation and coordination states in Fe-MCM41 and for the reversibility of successive reduction/oxidation cycles.
FeIMCM-41 is a very active catalyst for the Fischer-Tropsch reaction, with a high methane production. The high C 1 selectivity may be linked to the very small size of the metallic crystals that cannot sustain the chain growth although the pores are big enough not to impose steric constraints. Acknowledgements This work has been partially supported by Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) (PIP 4326), ANPCyT (PICT 4315), Comision de Investigaciones Cientificas Pcia.
FeIMCM-41 showed a high methane production, which can be justified taking into account that on small metallic particles the hydrocarbon chain growth finishes at low molecular weigh products, obtaining compounds up to C4 [10]. Although there are no steric constraints inside the pore structure, the very small metallic crystallite size does not allow enough CH x neighbors to sustain the chain growth. Besides, when the iron crystal size decreases, the activation energy and the amount of weakly chemisorbed hydrogen increases [II].