Abstract
E.s.r. spectra are measured for Y zeolites exchanged with cerium and copper ions after several dehydration treatments. Comparison of the results with those obtained for Cu-exchanged zeolites shows differences in the intensity and stability of some of the copper (II) species. A scheme is proposed for interpretation of these results, based on the formation of oxygen-bridged structures with CeIII and CuII ions in neighbouring S I′ positions. On the basis of this model, an explanation is given for the changes in Brönsted acidity and catalytic activity reported previously for the same samples.
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Schedule a callMore From: Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
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