Zeolites are extensively used in many applications as ion exchange agents, adsorbents, and catalysts. Characterizing the acidity of a zeolite is important to design and optimize it for a catalytic activity of interest. Among many methods developed for characterizing the acid sites of a zeolite, the Temperature Programmed Desorption technique is one of the most widely used in the industry. It provides quick and reproducible means to characterize the number of acid sites present, relative acidity, and heat of desorption of each site when ammonia is employed as the basic probe. Furthermore, the Bronsted acid site concentration can be characterized using an alkyl amine as the probe, which undergoes Hofmann elimination only by the Bronsted acid sites present on the surface of a zeolite.
Zeolites are extensively used in many applications as ion exchange agents, adsorbents, and catalysts. Characterizing the acidity of a zeolite is important to design and optimize it for a catalytic activity of interest. Among many methods developed for characterizing the acid sites of a zeolite, the Temperature Programmed Desorption technique is one of the most widely used in the industry. It provides quick and reproducible means to characterize the number of acid sites present, relative acidity, and heat of desorption of each site when ammonia is employed as the basic probe. Furthermore, the Bronsted acid site concentration can be characterized using an alkyl amine as the probe, which undergoes Hofmann elimination only by the Bronsted acid sites present on the surface of a zeolite.
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