Zeolite MCM-22: Synthesis, Dealumination and Structural Characterization

Unverricht, S.; Hunger, M.; Ernst, S.; Karge, Hellmut G.; Weitkamp, J.

doi:10.1016/S0167-2991(08)64087-2

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Zeolite MCM-22: Synthesis, Dealumination and Structural Characterization

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Karge, Hellmut G.
Fritz Haber Institute, Max Planck Society;

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Citation

Unverricht, S., Hunger, M., Ernst, S., Karge, H. G., & Weitkamp, J. (1994). Zeolite MCM-22: Synthesis, Dealumination and Structural Characterization. In J. Weitkamp, H. G. Karge, & H. Pfeifer (Eds.), Zeolites and Related Microporous Materials: State of the Art 1994 - Proceedings of the 10th International Zeolite Conference, Garmisch-Partenkirchen, Germany, 17-22 July 1994 (pp. 37-44). Amsterdam: Elsevier.

Cite as: https://hdl.handle.net/21.11116/0000-0009-9462-1

Abstract

Zeolite MCM-22 was synthesized and characterized by selected physico-chemical methods. MAS NMR spectroscopic studies reveal that at least five crystallographically non-equivalent T-sites exist in the structure of MCM-22 and that they are affected to different degrees by dealumination with Sicl₄vapors. From IR and TPDA experiments it can be concluded that the acidic properties of HMCM-22 are very similar to HZSM-5. A Spaciousness Index of ca. 8 is indicative of an effective pore width in the intermediate region between 10- and 12-membered ring zeolites.