(17)O DOR and other solid-state NMR studies concerning the basic properties of zeolites LSX.
We demonstrate complementary (1)H, (17)O, (27)Al and (29)Si measurements for basic low-silica-X zeolites, which were unloaded and pyrrole and formic acid-loaded. It was found that the acid-base-system is not stabile, if the loading exceeds one pyrrole molecule or two formic acid molecules per supercage.(17)O DOR NMR spectra exhibit at least four lines, which are broadened by a distribution of chemical shifts in a similar extend as the (29)Si MAS NMR spectra are broadened by distribution of Si-O-Al angles. A strong cation influence upon (17)O shifts was observed. But there was no strong influence of the acid molecules on the mean value of the (17)O shift of the spectra.
Schneider
Denis
D
Bruker BioSpin GmbH, Silberstreifen, 76287 Rheinstetten, Germany.
Toufar
Helge
H
Samoson
Ago
A
Freude
Dieter
D
D003198:Computer Simulation; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D010103:Oxygen Isotopes / Q000032:analysis / Q000737:chemistry; D011208:Powders; D017641:Zeolites / Q000737:chemistry*
D010103:Oxygen Isotopes; D011208:Powders; D017641:Zeolites