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Conference Paper

The essential identity of the framework structures of ZSM-8 and ZSM-5

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Citation

Weidenthaler, C., Fischer, R. X., & Shannon, R. D. (1994). The essential identity of the framework structures of ZSM-8 and ZSM-5. In J. Weitkamp, H. G. Karge, H. Pfeifer, & W. Hölderich (Eds.), Studies in Surface Science and Catalysis, Vol. 84 (pp. 551-558). Amsterdam: Elsevier.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-1DD8-2
Abstract
The crystal structures of TEA-ZSM-8 and its calcined template-free form have been studied by Rietveld analyses based on X-ray powder diffraction data. The results show that the aluminosilicate framework structure of ZSM-8 is essentially identical to that of ZSM-5. The tetraethylammonium molecule could be located in the difference Fourier analysis yielding positions similar to its TPA counterpart in ZSM-5. Lattice constants of ZSM-8 are in the same range as for ZSM-5. Contrary results are related to incorrectly indexed powder patterns. Optical investigations of ZSM-5 and ZSM-8 crystals showed that the zeolites studied here are both twinned exhibiting differently shaped twin individuals.