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Structure of the First Silicate Molecular Sieve with 18-Ring Pore Openings, ECR-34
Abstract
The three-dimensional microporosity of zeolite frameworks have allowed their widespread use in industry as heterogeneous catalysts, absorbents, and ion-exchangers. While the phosphate analogues of zeolites having up to 24 tetrahedral atoms in the pore openings are known, silicate-based zeolites have, until now, been limited to 14-membered ring pore openings. We now disclose the structure and characterization of the synthetic zeolite ECR-34, which can be prepared from a mixed alkali metal reaction gel containing tetraethylammonium (TEA) cations. Its structure has been determined from powder diffraction data and shows ECR-34 to be hexagonal with the dimensions a, b = 21.030(1) A, c = 8.530(1) A, containing one-dimensional, 18-ring pores with 10 A diameter free openings. ECR-34 is stable to 800 degrees C and is able to absorb and ion-exchange large organic molecules. The existence of ECR-34 suggests the potential of preparing other thermally stable silicate molecular sieves with extra-large pores.
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Metadata
- Authors
- Strohmaier, K. G., & Vaughan, D. E. W.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2003-12-01
- Volume
- 125
- Issue
- 51
- Pages
- 16035-16039
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W1984479151
- Cited by
- 191
- References
- 0
- FWCI
- 11.27
- Type
- journal article
- Language
- en
- Open access
- closed
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