Optical Investigations of Intergrowth Effects in the Zeolite Catalysts ZSM-5 
and ZSM-8

Weidenthaler, C.; Fischer, R. X.; Shannon, R. D.; Medenbach, O.

doi:10.1021/j100099a036

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Optical Investigations of Intergrowth Effects in the Zeolite Catalysts ZSM-5 and ZSM-8

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Citation

Weidenthaler, C., Fischer, R. X., Shannon, R. D., & Medenbach, O. (1994). Optical Investigations of Intergrowth Effects in the Zeolite Catalysts ZSM-5 and ZSM-8. The Journal of Physical Chemistry, 98(48), 12687-12694. doi:10.1021/j100099a036.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-2207-3

Abstract

X-ray precession photographs and optical investigations of TPA-ZSM-5 (silicalite) and TEA-ZSM-8 zeolites
reveal that ZSM-8 consists of two interpenetrating species rotated by 90° round the crystallographic c axis
similarly to ZSM-5. The c axis of ZSM-5 coincides with refractive index n_x, the c axis of ZSM-8 coincides
with n_y. The intergrowth species are differently shaped in ZSM-5 and ZSM-8. ZSM-5 consists of an
orthorhombic prism penetrated by two pyramidal fragments. The ZSM-8 crystals studied here consist of
species with two-dimensional hourglass-like shapes embedded in orthorhombic prisms. The orientations of
the optical indicatrices of ZSM-5 and ZSM-8 are identical after calcination, Le., after removing or decomposing
the template. This confirms recent work which showed that the framework structures of ZSM-5 and ZSM-8
are essentially identical.