Abstract
Publisher Summary This chapter discusses the acidity characterization of dealuminated H-ZSM-5 zeolites by isopropanol dehydration. A series of dealuminated ZSM-5 zeolites with various framework silicon/aluminium (Si/Al) ratios are prepared by different methods. The number of acid sites that correspond to the high-temperature desorption peak of the ammonia-temperature-programmed desorption (TPD) spectra of all the dealuminated samples is in 1:1 mole analogy to the framework Al (FAl), irrespective the degree and the type of dealumination method. The catalytic activity of the H-ZSM-5 zeolites for isopropanol dehydration is linearly related to the number of acid sites that correspond to the FAl-content (Bronsted acidity). The Si–Al amorphous phase that is formed in the high-temperature steamed samples affects activity and induces different product selectivity for propene and diisopropyl ether.
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