title: (17)O DOR and other solid-state NMR studies concerning the basic properties of zeolites LSX.
abstract: 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.
authors.affiliation: Bruker BioSpin GmbH, Silberstreifen, 76287 Rheinstetten, Germany.
authors.forename: Denis
authors.initials: D
authors.lastname: Schneider
authors.forename: Helge
authors.initials: H
authors.lastname: Toufar
authors.forename: Ago
authors.initials: A
authors.lastname: Samoson
authors.forename: Dieter
authors.initials: D
authors.lastname: Freude
mesh_terms: 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*
chemical_list: D010103:Oxygen Isotopes; D011208:Powders; D017641:Zeolites