Beta-cage

Zeolite A Three-dimensional 4.2 into alfa-cage 2.2 into beta-cage 2 7.0... 

Zeolite X Three-dimensional 7.4 into supercage 2.2 into beta-cage 2.5 6.4... 

B. Beagley, J. O. Titiloye, Modeling the Similarities and Differences between the Sodalite Cages (Beta-Cages) in the Generic Materials - Sodalite, Zeolites of Type-A, and Zeolites with Faujasite Frameworks Struct. Chem. 1992, 3, 429-448. 

P-08 - Encapsulated guest atoms within the basic beta cage of sodalitic zeolite. A theoretical ab-initio study... 

NiO in super cage (reducible at low temperatures), monolayer NiO in super cage and beta cage (reducible at high temperatures), NiO-Al203 complex oxides such as spinel in zeolite mesopores (not reduced in TPR experiments). 

The dynamic character of the template-zeolite interactions has only been studied recently [39]. Experimental data (solid state and NMR between -120 C and 20°C), as well as molecular dynamic (MD) calculations at -150 C, -120 C and 0 C, indicate that the tetramethylammonium (TMA) ion occluded in the beta cage of sodalite has a considerable degree of rotational freedom. Figure 10, even at low temperature. MD shows that this rotational freedom originates from the dynamics of the zeolite lattice the distance between... 

The structural unit in Type A zeolite (Linde Type A or LTA), as well as in Types X and Y (faujasite or FAU), is the truncated octahedron shown in Figure 7.1(a). This unit is also called sodalite cage or beta cage, as sodalite is formed by directly... 

Figure 7.1. Line representations of zeolite structure (a) sodalite cage, or beta cage ortruncated octahedron (b) type A zeolite unit cell (c) unit cell of types X and Y, or faujasite (d) cation sites in type A (there are eight I, three II, and twelve III sites per unit cell) (e) cation sites in types X and Y (16 I, 32 I , 32 II, 32 II , 48 III, and 32 IN sites per unit cell).

In faujasite zeolites, the cations in the beta-cages and the double six-ring (SD6R, the hexagonal prism) (i.e., at sites SI, SI", and SIT) are sterically inaccessible to nitrogen, and so only the supercage cations (i.e., those at SII and... 

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