RESEARCH OF THE ACID PROPERTIES OF THE AMMONIUM FORM OF ZEOLITE (CLINOPTILOLITE) (NH4X)
The work involved methods for assessing the acidity of the surface of oxide catalysts, since acid sites play a significant role in a number of catalytic reactions. To date, the most studied and widespread of natural centers is ammonium salts with an aqueous solution of 0.1 NNH4 clinoptilolite. It is known that in a homogeneous liquid medium, Brønsted or Lewis acids and bases behave as rather nonspecific catalysts in relation to most of the reactions listed above. It has been established that preliminary thermal dehydroxylation of catalysts stabilizes their surface with respect to ammonia. The study showed that the decomposition of the ammonium form of zeolite begins at 373 K and ends almost at 573 K.
Keywords: catalyst, clinoptilolite, ammonium, zeolite, proton, alkaline earth.