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Dehydrated Cs-Y and Cs-X zeolites have been studied by variable temperature 133 Cs MAS NMR spectroscopy from -150 to 150 o C, in nitrogen, dry air and oxygen atmospheres. Large 133 Cs shifts were observed at low temperatures due to O 2 -Cs interactions for 133 Cs resonances from cations in the supercages, but not from cations in...
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