Abstract
The changes in the structures of ammonium-exchanged forms of zeolite Y under conditions of prolonged exposure in air are studied by IR spectroscopy. It is established that the cation distribution in freshly prepared samples is nonequilibrium: the cations migrate with time to the most energetically stable sites. In addition, partial decomposition (no more than 3 to 6%) of the NH4+-form is also observed, which results in a decrease in the ionic character of the framework bonds that is equivalent to an apparent increase in the framework silicate modulus.
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