Abstract
We demonstrate complementary 1H, 17O, 27Al and 29Si 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. 17O DOR NMR spectra exhibit at least four lines, which are broadened by a distribution of chemical shifts in a similar extend as the 29Si MAS NMR spectra are broadened by distribution of Si–O–Al angles. A strong cation influence upon 17O shifts was observed. But there was no strong influence of the acid molecules on the mean value of the 17O shift of the spectra.
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