Abstract
Synthetic high-silica zeolites (typified by ZSM-5) are powerful catalysts used extensively in the petroleum industry. The channels and cavities of their aluminosilicate framework render their catalytic activity very shape-specific. The varying attributes of individual members of this family depend primarily on subtle changes in framework topology. Unfortunately, these high-silica zeolites are difficult to synthesize as large, that is >100 µm, single crystals, so conventional X-ray structural methods are not appropriate. We have used a combination of techniques to elucidate the framework topology of a new, synthetic high-silica zeolite, Theta-1, which was first prepared as small <2 µm crystals in our laboratories. It exhibits a novel unidimensional 10-T-ring channel system with a medium pore structure, thereby differing from other known structure-types that classify zeolites and suggesting unique shape-selective properties.
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Barri, S., Smith, G., White, D. et al. Structure of Theta-1, the first unidimensional medium-pore high-silica zeolite. Nature 312, 533–534 (1984). https://doi.org/10.1038/312533a0
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DOI: https://doi.org/10.1038/312533a0
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