FAU (faujasite) belongs to the family of aluminosilicate molecular sieves defined by the formula \( \left|{\left(\mathrm{C}\mathrm{a}, \mathrm{Mg}, {\mathrm{Na}}_2\right)}_{29}{\left({\mathrm{H}}_2\mathrm{O}\right)}_{240}\right|\left[{\mathrm{Al}}_{58}{\mathrm{Si}}_{134}{\mathrm{O}}_{384}\right]-\mathrm{F}\mathrm{A}\mathrm{U} \) (www.iza-online.org). Two types of synthetic FAU zeolites referenced as Linde X and Linde Y differ in Si/Al atomic ratio, which is typically in the range from 1 to 1.5. one to two for the X and higher for the Y zeolite. The 24-tetrahedra cuboctahedral units (sodalite cages) in the FAU framework type are connected via hexagonal prisms (double six-rings) forming a three-dimensional porous channel structure along [110]. These are characterized by 12-oxygen ring window openings with the aperture of 8 Å and supercages of approximately 12 Å (McCusker and Baerlocher 2001). The FAU-type zeolite supercage viewed along [111] is shown in Fig. 1(International Zeolite...
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References
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Julbe, A., Drobek, M. (2016). Faujasite. In: Drioli, E., Giorno, L. (eds) Encyclopedia of Membranes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44324-8_689
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