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Synthesis temperature effect on Na-Mica-4 crystallinity and heteroatom distribution

AutorNaranjo, Moisés; Castro, Miguel A.; Cota, Agustín; Osuna, Francisco J. ; Pavón, Esperanza ; Alba, María D.
Palabras claveSwelling mica
XRD
MAS
NMR
Charge distribution
Fecha de publicación2015
EditorElsevier
CitaciónMicroporous and Mesoporous Materials, 204: 282-288 (2015)
ResumenThe discovery of swelling brittle mica, Na-Mica-4, has been one of the most significant advances in the pursuit for a material with high ion-exchange capacity. For technical applications, the control of the phase evolution during the synthesis is crucial. The main aim of this study was to investigate the effect of Na-Mica-4 synthesis temperature on the crystalline phase evolution, Si–Al distribution in the tetrahedral sheet, the Al occupancy between tetrahedral and octahedral sites and their effects on the interlayer space composition. The synthesis temperature range between 600 °C and 900 °C was explored. At low temperature (600 °C), the precursors were transformed in a low-charged swelling 2:1 phyllosilicate, saponite type, which was progressively aluminum enriched with temperature. The high-charged swelling mica was completely formed at 700 °C, although a minor anhydrous contribution remained up to 850 °C. Up to 800 °C, silicates and fluorides secondary phases were detected as a minor contribution.
Versión del editorhttp://dx.doi.org/10.1016/j.micromeso.2014.11.026
URIhttp://hdl.handle.net/10261/117338
DOI10.1016/j.micromeso.2014.11.026
ISSN1387-1811
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