Characterization of zeolite acidity. A gas-chromatographic study using n-butylamine and ammonia

Abstract

The acidity of a hydrogen mordenite and two dealuminated hydrogen mordenites has been determined by gas chromatography using ammonia and n-butylamine. In the case of hydrogen mordenite the results show a higher acidity value when ammonia was used than when n-butylamine was used as base, whereas for the dealuminated mordenites the results for both bases are in good agreement. However, in the case of all the mordenites the acidity values have been found to be higher than those determined by either calorimetry or the Benesi method and this has been interpreted as being due to the fact that the gas-chromatographic method includes some physical adsorption.