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- W2056522575 abstract "Abstract Rb-exchange and thermal stability of the microporous titanosilicate AM-2 were analysed by powder X-ray diffraction, thermo-gravimetric analysis, and chemical analysis of the mother liquid after exchange. The dehydration and thermal stability of the exchanged structure were monitored with in situ high temperature powder X-ray diffraction. Crystal structures were refined with Rietveld methods at 25 and 400 °C. The AM-2 structure was found to incorporate Rb + by replacing K + . After four exchange cycles and 166 h reaction time at 90 °C, the chemical composition was refined to K 0.18 Rb 1.82 TiSi 3 O 9 ·H 2 O. Extrapolation suggests that higher exchange ratios may be obtained after further cycles. H 2 O was expelled by heating, leading to a dehydrated structure at 360 °C. Dehydration was associated with a change of space group symmetry from orthorhombic P 2 1 2 1 2 1 to monoclinic P 2 1 , which proved to be reversible after rehydration. This change of symmetry leaves the AM-2 characteristic structural topology uninfluenced and causes only minor distortions. The monoclinic AM-2 structure breaks down above 600 °C to become X-ray amorphous, and at 750 °C a wadeite-type phase (K x Rb 2− x TiSi 3 O 9 ) crystallises. This transformation is irreversible and leads to immobilisation of Rb + ." @default.
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- W2056522575 date "2007-01-01" @default.
- W2056522575 modified "2023-09-25" @default.
- W2056522575 title "Microporous titanosilicate AM-2: Rb-exchange and thermal behaviour" @default.
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- W2056522575 doi "https://doi.org/10.1016/j.materresbull.2006.05.006" @default.
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