Iron exchanged natural mordenite: UV-Vis diffuse reflectance and Mössbauer spectroscopy characterisation Online publication date: Thu, 04-Feb-2016
by Daria Tito-Ferro; Inocente Rodríguez-Iznaga; Beatríz Concepción-Rosabal; Gloria Berlier; Fernando Chávez-Rivas; Arbelio Penton-Madrigal; Felipe F. Castillón-Barraza; Vitalii Petranovskii
International Journal of Nanotechnology (IJNT), Vol. 13, No. 1/2/3, 2016
Abstract: Purified natural mordenite (ZP) from Palmarito de Cauto deposit, Cuba, was modified with Fe2+ and Fe3+cations through ion-exchange in acid medium and characterised by UV-Vis diffuse reflectance, FTIR and Mössbauer spectroscopies. Fe2+ exchange is less favoured than Fe3+ exchange, which may be due to higher Fe3+ valence. In the Fe2+ exchanged samples, Fe2+ZP, all incorporated Fe2+ is found in octahedral coordination and it should be mainly in cationic extra-framework positions inside mordenite channels as a charge compensating cation. In the case of the Fe3+ exchanged samples, Fe3+ZP, the incorporated Fe3+ is present in both octahedral and tetrahedral coordination and it can be in both cationic extra-frameworks positions as a charge compensating cation and in form of oxy-hydroxides originated by Fe3+ hydrolysis.
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