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- W2086318995 abstract "A numerical analysis of the 1H MAS NMR sideband pattern of the bridging OH groups in various zeolites of the aluminosilicate type (LTA, faujasite, erionite, mordenite, pentasil) and of the silicoaluminophosphate type (SAPO-5, −17, −34, −37) yields H-Al distances of the hydroxyl protons to the adjacent framework aluminium nucleus which cover a range between 0.234 and 0.252 nm. From the results, a relation between the H-Al distance and the size of the oxygen rings (6−, 8−, 10− and 12-membered oxygen rings) could be derived. Using 29Si CP/MAS NMR it was shown that the bridging OH groups in zeolites of the aluminosilicate type are located at the Si(nAl) sites with the largest possible number n. While the second coordination sphere of the T positions of the bridging OH groups in zeolites of the silicoaluminophosphate type (Si/(Al + P + Si) < 0.12) is occupied by the same number of phosphorus and aluminium atoms, the bridging OH groups in zeolites of the aluminosilicate type with medium framework aluminium densities are located at the Si(nAl) sites with n = 3, 2 and 1." @default.
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- W2086318995 date "1993-02-01" @default.
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- W2086318995 title "Study of the geometry and location of the bridging OH groups in aluminosilicate and silicoaluminophosphate type zeolites using 1H MAS NMR sideband analysis and CP/MAS NMR" @default.
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- W2086318995 doi "https://doi.org/10.1016/0927-6513(93)80005-f" @default.
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