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  • Local environment of isolated iron in mesoporous silicate catalyst FeTUD-1
    Novak Tušar, Nataša ...
    Mesoporous silicate catalyst FeTUD-1 containing only isolated iron was synthesized. Local environment of iron was investigated by X-ray Absorption and Mössbauer spectroscopies. XANES (X-ray ... Absorption Near Edge Structure) studies show that iron in the as-synthesized and template-free FeTUD-1 is present in the form of Fe3+ ions in coordination geometries posses an inversion center. EXAFS (X-ray Absorption Fine Structure) analyses reveal thatiron cations in the as-synthesized sample are coordinated to four oxygens at the distance of 1.87 A and in the template-free sample to one oxygen at 1.86 A and five oxygens at 2.0 A distances. Mössbauer spectroscopy proves the presence of iron in Fe3+ form in template-free sample. Moreover, it determinesFe3+ in two types of distorted octahedral coordinations.
    Vrsta gradiva - članek, sestavni del
    Leto - 2007
    Jezik - angleški
    COBISS.SI-ID - 3752986