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- W4229582357 abstract "Open, crystalline, well-defined microporous structures of zeolites (general formula Mxn[(AlO2)x(SiO2)y]-mH2O) can be converted, either by hydrothermal treatment or by exposure to gaseous SiCl4, to their highly siliceous analogues (idealised formula SiO2) in which the crystallinity and microporosity of the parent material is retained. Such dealuminated solids yield more structural information than do their aluminous precursors when investigated by high-resolution electron microscopy (HREM) and by 29Si magic-angle-spinning NMR (MASNMR). Thus, intergrowths of ZSM-5 and ZSM-11 structures are readily identified (by HREM) at the sub-unit cell level as are ultrafine recurrent twins in faujasitic zeolites, coincidence boundaries (of a hitherto unknown kind) in zeolite L and unusual structural features in offretite. Likewise, MASNMR spectra of dealuminated zeolites yield, in a direct manner, the number and distribution of non-equivalent tetrahedral sites per unit cell of the framework." @default.
- W4229582357 created "2022-05-11" @default.
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- W4229582357 date "1984-11-01" @default.
- W4229582357 modified "2023-09-26" @default.
- W4229582357 title "Dealuminated zeolites" @default.
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- W4229582357 doi "https://doi.org/10.1016/0304-5102(84)85070-1" @default.
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