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By Wheeler P. Davey

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8. The numbering scheme for T positions introduced by [66V1] is used. 8 Zeolites having MOR-, FER-, BOG-, EPI-, and TER-type framework [Ref. p. 155 and T4 positions are switched. Ferrierite contains 10-, 8-, 6-, and 5-membered rings of tetrahedra in its structure [66V1]. The atoms in these channels are highly disordered. The zeolitic channel system of ferrierite framework is characterized by 10-membered-ring channels running parallel to the crystallographic [001] direction and by 8-membered-ring channels running parallel to the [010] direction.

The projections of the maricopaite structure on (001) and (010) are shown in Fig. 7. Maricopaite, in contrast to mordenite, has only a one-dimensional channel system consisting of two channel types, one of which is permanently obstructed. However, single-ring interchannel ports may allow some diffusion in a second dimension. The elliptical 12-membered-ring channels, parallel to c in mordenite, are retained in maricopaite but have a somewhat different shape in cross section. 1007/978-3-642-30612-9_1 © Spr inger 2013 Lando lt -Börnst ein New Series III/27I6γ Ref.

The siliceous mordenites were obtained by a dealumination treatment [92C2, 95W1]. A polycrystalline mordenite membrane with a small crystallite size was prepared using tetraethylammonium bromide as a template and by aging. The smallest crystals obtained were around 4…5 m [02Z1]. Mordenite with crystal diameter smaller than 100 nm has been obtained by [04H1]. The influences of synthesis parameters, including seed crystal, silicon precursor, as well as SiO2/Al2O3, Na2O/SiO2, and H2O/SiO2 ratios, on mordenite crystallization were investigated [11Z2].

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A study of crystal structure and its applications by Wheeler P. Davey


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