Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 39, Pages 10398-10402Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201405658
Keywords
electron microscopy; microporous materials; structure elucidation; X-ray diffraction; zeolites
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Funding
- Swiss National Science Foundation
- Chevron Energy Technology Company
- Swedish Research Council (VR)
- Knut and Alice Wallenberg Foundation
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The synthesis of the high-silica zeolite SSZ-61 using a particularly bulky polycyclic structure-directing agent and the subsequent elucidation of its unusual framework structure with extra-large dumbbell-shaped pore openings are described. By using information derived from a variety of X-ray powder diffraction and electron microscopy techniques, the complex framework structure, with 20 Si atoms in the asymmetric unit, could be determined and the full structure refined. The Si atoms at the waist of the dumbbell are only three-connected and are bonded to terminal O atoms pointing into the channel. Unlike the six previously reported extra-large-pore zeolites, SSZ-61 contains no heteroatoms in the framework and can be calcined easily. This, coupled with the possibility of inserting a catalytically active center in the channel between the terminal O atoms in place of H+, afford SSZ-61 intriguing potential for catalytic applications.
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