Por favor, use este identificador para citar o enlazar este ítem: http://repositoriodigital.ipn.mx/handle/123456789/11148
Título : Solid state multinuclear NMR study of iron species in natural and modified clinoptilolite from Tasajera deposit (Cuba)
Palabras clave : Natural clinoptilolite
129Xe NMR
Fecha de publicación : 16-ene-2013
Editorial : ScienceDirect
Descripción : The present study has been conducted to elucidate the Fe-sites in natural clinoptilolite, and the possibility to produce a reversible replacement of these atoms in the zeolite framework. In order to achieve these results we have tried to introduce iron in clinoptilolite structure after the almost total extraction of the natural iron species. A sample of the purified natural clinoptilolite from Tasajeras deposit, Central region of Cuba, was modified by a hydrothermal treatment with orthophosphoric acid. Iron exchange forms of the orthophosphoric zeolite were obtained using FeSO4 and Fe2(SO4)3 solutions. The modified zeolites were studied by multinuclear magnetic resonance (27Al, 29Si, 31P MAS NMR and 129Xe NMR). Other analytical techniques as Electron Paramagnetic Resonance, X-ray diffraction, Mo¨ssbauer and Infrared spectrometry, volumetric measurements and chemical analysis by Induced Plasma Coupled spectroscopy were used to support the results of NMR studies. The presence of iron species with tetrahedral and octahedral coordination in the structure of a natural clinoptilolite has been confirmed. The influence of iron in tetrahedral coordination in the thermal stability of the clinoptilolite structure was also confirmed
URI : http://www.repositoriodigital.ipn.mx/handle/123456789/11148
Otros identificadores : Microporous and Mesoporous Materials 111 (2008) 577–590
Aparece en las colecciones: Doctorado

Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
2008MicropMesoGRF 2.pdf64.59 kBAdobe PDFVisualizar/Abrir

Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.