Type X and Y are representative molecular sieve of mid silicon series, which are applied as catalyst and catalyst carrier. It has the double abilities of solid acid and metal. It also has high activity and selection because of the uniform aperture system. It can choose the shape to catalyse the reactant and the reacted result by itself. It is widely used in pyrolysis gas, hydrocracking, isomerization reforming, toluene dispropornation, aviation kerose dewaxing, desulfurization, dehydration, air separation, oxyen separation as well as carbon dioxide, etc.