Zeolite templates are organic or inorganic molecules or complexes that are used in the synthesis of zeolites. Zeolites are crystalline materials that are characterized by their porous structures and high surface areas. They have many applications, including as catalysts, adsorbents, and ion exchange materials. Zeolite templates are used to direct the synthesis of zeolites and to control their crystal structure and pore size. They act as a framework around which the zeolite crystals can grow. The template is usually removed from the final product by calcination or other methods, leaving behind the desired zeolite structure.
Organic templates are typically quaternary ammonium ions, such as tetramethylammonium (TMA) or tetrapropylammonium (TPA). Inorganic templates include metal cations, such as sodium or potassium, or complex ions, such as hexamethylene diammonium (HMDA) or triethylenetetramine (TETA). The choice of template depends on the desired zeolite structure and properties. The use of different templates can lead to the synthesis of different zeolite structures and morphologies. Zeolite templates are an important tool in the synthesis of zeolites and in the development of new zeolite materials with tailored properties.