Catalyst acidity is a vital property, especially for acid-catalyzed reactions. Temperature-Programmed Ammonia Desorption (TPAD) is a common technique used to measure the acidity of solid catalysts. In this method, ammonia is adsorbed onto the catalyst surface, and the temperature is increased to desorb the ammonia. The amount and profile of desorbed ammonia provide insights into the strength and distribution of acidic sites on the catalyst.
