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Crystallization mechanism of Fe-MFI from wetness impregnated Fe2O3-SiO2

dc.contributor.authorMelero, J. A.
dc.contributor.authorCalleja, G.
dc.contributor.authorMartínez, F.
dc.contributor.authorMolina, R.
dc.contributor.authorLázár, K.
dc.identifier.citationMicroporous and Mesoporous Materials 74 (2004) 11-21es
dc.description.abstractThe crystallization mechanism of Fe-MFI zeolite synthesized from amorphous Fe2O3- SiO2 xerogels wetness impregnated with aqueous TPAOH solutions has been studied. Samples with different degrees of crystallinity were prepared and characterized by means of conventional techniques. Activity and stability of these iron-containing samples has been tested in the catalytic wet peroxide oxidation (CWPO) of phenolic aqueous solutions. The crystallization mechanism involves a partial dissolution of the initial xerogel to yield an amorphous material. Nucleation and growth of the MFI phase is effected by reorganisation of the amorphous phase, although crystal growth also involves the incorporation of iron and silicon species during the last stage of the crystallization. A highly crystalline Fe-silicalite material is obtained after 3 hours of synthesis at 170 ºC. Spectroscopic studies reveal that iron species are in framework positions (isomorphously substituted) in this highly crystalline material. In addition, the environment of Fe atoms as well as textural properties of the samples is dramatically modified along the crystallization affecting significantly to their catalytic activity and stability in CWPO
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subjectMedio Ambientees
dc.titleCrystallization mechanism of Fe-MFI from wetness impregnated Fe2O3-SiO2es
dc.subject.unesco2391 Química Ambientales
dc.description.departamentoTecnología Química y Ambiental

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Atribución-NoComercial-SinDerivadas 3.0 EspañaExcept where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 España