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- W1988413612 abstract "At room temperature, framework aluminum (FAl) is extracted rapidly from the lattice of H-ZMS-5 by molecular fluorine. Ionic fluoro-complexes containing octahedral aluminum are formed within the micropores of the zeolite. The structure remains intact while the Si/FAl increases, for instance from 27 to 233 or from 55.2 to 382. As shown previously, the behavior of HY with respect to molecular fluorine is similar. The terminal SiOH in H-ZSM-5 are also fluorinated. The extent of this reaction was negligible in the case of HY. The quantitative distinction between the fluorine atom in SiF and the aluminum fluoro-complexes is possible using 19F MAS NMR, HETCOR and TRAPDOR. The good agreement between 27Al and 19F NMR data and the quantitative analysis of the infrared spectra in the OH stretching region is outlined. In particular, the disputed assignment of the 3700 cm−1 band to OH on non-framework aluminum moieties is elucidated." @default.
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- W1988413612 date "2001-12-01" @default.
- W1988413612 modified "2023-10-14" @default.
- W1988413612 title "Dealumination and surface fluorination of H-ZSM-5 by molecular fluorine" @default.
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- W1988413612 doi "https://doi.org/10.1016/s1387-1811(01)00433-4" @default.
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