Kentgens, A.p.m.; Scholle, K.f.m.g.j.; Veeman, W.s.:
Effect of hydration on the local symmetry around aluminum in ZSM-5 zeolites studied by aluminum-27 nuclear magnetic resonance.
1983
In: Journal of Physical Chemistry (J.Phys.Chem.), Jg. 87 (1983), Heft 22, S. 4357 - 4360
Artikel/Aufsatz in Zeitschrift / Fach: Chemie
Titel:
Effect of hydration on the local symmetry around aluminum in ZSM-5 zeolites studied by aluminum-27 nuclear magnetic resonance.
Autor(in):
Kentgens, A.p.m.; Scholle, K.f.m.g.j.; Veeman, W.s. im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen
Erscheinungsjahr:
1983
Erschienen in:
Journal of Physical Chemistry (J.Phys.Chem.), Jg. 87 (1983), Heft 22, S. 4357 - 4360
ISSN:

Abstract:

The effect of hydration and dehydration on the elec. field gradient at the 27Al nucleus in ZSM-5 zeolites was studied by magic angle spinning NMR at 3 different magnetic field strengths. Dehydration causes an increase of the 27Al NMR line width due to an increased quadrupole interaction. The dehydration causes a redistribution of elec. charges and/or a conformation change of the Al-O tetrahedra. The latter possibility seems to be most important since the effect is cation dependent, as shown by results on Na-ZSM-5 and H-ZSM-5. Similar effects are obsd. for faujasite H-Y and amorphous SiO2/Al2O3.