Healey, A. M., Johnson, G. M. and Weller, M. T.
The synthesis and characterisation of JBW-type zeolites. Part A: Sodium/potassium aluminosilicate, Na2K Al3Si3O12 center dot 0.5H(2)O
Microporous and Mesoporous Materials, 37, (1-2), . (doi:10.1016/S1387-1811(99)00262-0).
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Bulk zeolite JBW, Na2K[Al3Si3O12]. 0.5H(2)O, has been synthesised under hydrothermal conditions (225 degrees C) from a solution containing both sodium and potassium ions. The structure has been refined, at room temperature and at 4 K, from powder neutron diffraction data. Sodium ions occupy sites in the non-hydrated cristabolite layers while the eight-ring channels contain lines of alternating potassium ions and water molecules. The positions of the water molecules have been fully determined, including their hydrogen bonding interaction with the framework. The dual templating effect of sodium and potassium at different sites in the JBW structure seems to be a prerequisite for the formation of pure JBW from aqueous solution.
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