期刊
NATURE MATERIALS
卷 11, 期 12, 页码 1059-1064出版社
NATURE PORTFOLIO
DOI: 10.1038/NMAT3455
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资金
- Flemish government
- BelSpo
- Research Board of the Ghent University
- European Research Council [240483]
- ERC [246791-COUNTATOMS]
- FWO-Vlaanderen
- Hercules Foundation
- Belgian government
Although the search for new zeolites has traditionally been based on trial and error, more rational methods are now available. The theoretical concept of inverse sigma transformation of a zeolite framework to generate a new structure by removal of a layer of framework atoms and contraction has for the first time been achieved experimentally. The reactivity of framework germanium atoms in strong mineral acid was exploited to selectively remove germanium-containing four-ring units from an UTL type germanosilicate zeolite. Annealing of the leached framework through calcination led to the new all-silica COK-14 zeolite with intersecting 12-and 10-membered ring channel systems. An intermediate stage of this inverse sigma transformation with dislodged germanate four-rings still residing in the pores could be demonstrated. Inverse sigma transformation involving elimination of germanium-containing structural units opens perspectives for the synthesis of many more zeolites.
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