Abstract
The presence of paramagnetic Fe3+ impurities in zeolites can interfere with electron spin echo studies to decrease echo intensity. To study these effects Fe3+ as iron oxide and as structural Fe3+ was extracted from zeolites with an extraction procedure using ethylenediaminetetraacetic acid in the presence of aluminium nitrate. Comparison of electron spin echo signals of exchanged Cu2+ before and after iron extraction in X, Y and mordenite zeolites is reported. Commonly occurring quantities of Fe3+ influence both three-pulse and two-pulse echo signals by decreasing the echo intensity and by increasing the echo decay rate.
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