Abstract
A study has been made of temperature programmed desorption (TPD) of NH3 and H2O from samples of NH4X and CoNH4X zeolites of various degree of exchange. NH3 TPD peaks could be explained by interaction of NH3 with different Bronsted and Lewis acidic centers. Moreover a water peak at high temperatures allowed interpretations of the dehydroxylation, and by reason of the characteristic desorption temperatures a particular state of the Co2+ ions in the CoNH4X zeolites is postulated.
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