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- W2085691323 abstract "Steamed zeolite Y samples were examined by 27Al MAS NMR, 1H spin−echo editing MAS NMR, and 1H27Al} double-resonance MAS NMR in order to evaluate the dealumination process during steaming. Framework-related Al−OH groups are observed in the 1H MAS NMR spectrum after steaming at low partial pressure (3166 Pa). These species manifest themselves in the 27Al MAS NMR spectrum as a sharp signal due to the octahedrally coordinated species. Ammonia adsorption converts the coordination of these Al species from octahedral to tetrahedral. Steaming at high partial pressure generates a 27Al MAS NMR spectrum that does not show the sharp line due to the octahedrally coordinated framework-related Al−OH. Therefore, the framework-related Al−OH are considered as intermediate species in the full hydrolysis of Al from the framework." @default.
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- W2085691323 date "2001-01-18" @default.
- W2085691323 modified "2023-09-26" @default.
- W2085691323 title "Steaming of Zeolite Y: Formation of Transient Al Species" @default.
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- W2085691323 doi "https://doi.org/10.1021/jp001620p" @default.
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