Also known as modern water purification activated alumina, it is named Activated Alumina or Reactive Alumina; activated alumin(i)um oxide. Aluminum oxide (AL2O3) used in catalysts is commonly referred to as activated alumina, which is a porous, highly dispersed solid material with a large surface area. Its microporous surface possesses the required characteristics for catalytic action, such as adsorption properties, defluorination, drying properties, surface activity, and excellent thermal stability. Therefore, it is widely used as a household drying agent, as well as a catalyst and catalyst carrier in chemical reactions.