Common desiccant for chemical adsorption are quick lime desiccant, magnesium chloride, calcium chloride, soda lime or phosphorus pentoxide, silicic acid and so on. They are chemical substances that absorb water molecules and change their chemical structure to become another substance.
Common physical desorption desiccant silica gel desiccant, clay desiccant, molecular sieve desiccant, mineral desiccant, fiber desiccant, montmorillonite desiccant and so on.