Zeolite molecular sieves have the structure and characteristics of crystals.

Molecular sieve, the substance of that has a uniform microporous channel structure. Molecules that are smaller than the pore size can be sucked into the pores, and molecules that are larger than the pore size are blocked out of the pores. According to the size of the molecules, various components are separated. At present,such substances are called zeolites or zeolite molecular sieves. The early research of zeolite molecular sieve originated in the nineteenth century,which is industrialization beginning in the 1960s. In recent years, the rapid development of zeolite molecular sieves in science and industry also promotes its wide application in scientific fields such as gas separation, catalysis, and materials.

Zeolite molecular sieves have the structure and characteristics of crystals. The surface is a solid framework, and the internal pores can play the role of adsorbing molecules. The pores are connected with each other by channels, and the molecules pass through the channels. Due to the crystalline nature of the pores, the pore size distribution of molecular sieves is very uniform. Molecular sieves selectively adsorb molecules according to the size of the internal pores of their crystals. They adsorb molecules of a certain size and reject molecules of larger substances, so they are vividly called "molecular sieves".

The function of molecular sieve adsorption or repulsion is affected by the electrical properties of the molecule. Synthetic zeolite has the special function of selective adsorption according to the size and polarity of the molecule, so it can dry or purify the gas or liquid, which is also the basis for the separation of molecular sieves. Synthetic zeolite can meet the broad demands of the industry for products with adsorption and selective properties, and it is also widely used in synthetic zeolite molecular sieves in industrial separations.