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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 by M. Hunger; M.W. Anderson; A. Ojo; H. Pfeifer is a Chemistry article available to read on EtoBox.

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A numerlcal analysis of the 'H MAS NMR sldeband pattern of the brldgmg OH groups m various zeohtes of the alummoslhcate type (LTA, fauJaslte, enomte, mordemte, pentasll) and of the slhcoalummophosphate type (SAPO-5, -17, -34, -37) yields H-Al distances of the hydroxyl protons to the adJacent framework alummmm 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 rmgs (6-, 8-, lo-and 12-membered oxygen rings)) could be derived Using 29S1 CP/MAS NMR It was shown that the brldgmg OH groups m zeohtes of the alummoslhcate type are located at the Sl(nA1) sites with the largest possible number n While the second coordmatlon sphere of the T posltlons of the bridging OH groups m zeohtes of the slhcoalummophosphate type (%/(A1 + P + sl) < 0 12) IS occupied by the same number of phosphorus and alummmm atoms, the bridging OH groups m zeohtes of the alummoslhcate type with medium framework alummmm densities are located at the Sl(nA1) sites with n = 3, 2 and 1

Who reads 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?

Author

M. Hunger; M.W. Anderson; A. Ojo; H. Pfeifer

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-6513)

Published

1993

Language

EN

Field

Chemistry (Physical Sciences)