Abstract
In thermometric titrations of acidic, decationized zeolites with n-butylamine, pore volume limitations restricted the titer of activated NH 4-Y to approximately 80% of its ion exchange capacity, whereas neutralization of both Brönsted and Lewis sites caused activated, ultrastable Y to exhibit a titer of 160% of its precursor's ion exchange capacity. Because of pore mouth blockage by strongly adsorbed base, activated large-port mordenite exhibited only a very small titer. In titrations with the weak, sterically hindered base, 2,6-dimethylpyridine, activated ultrastable Y exhibited approximately twice the titer of activated NH 4-Y.
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