Zeolites gallosilicate, framework studies

A series of crystalline gallosilicate molecular sieves with the zeolite P structure synthesised by a rapid method from alkali-free hydrogels have been studied by NMR methods, including Ga MAS NMR (Occelli et al. 1999). The Ga spectra (Figure 10.12B) show that most samples contain only tetrahedral Ga in framework... 

Protons associated with water molecules have been located in a number of systems including sodaUte [86,87], and NAT [88], ABW [74,77] and ANA framework [89] gallosilicates. Hydroxylic proton pomticms have been determined in sodalite [86,90] and in a steam-treated zeolite rho [91,92]. The flexibility of the RHO-framewoik has also been further probed by PND studies cm cation-exchanged matoials [93,94] and cm ammonium-ion exchanged and heat-treated zeolite rho [95]. 

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