ZEOLITE MOLECULAR SIEVE
ZEOLITE MOLECULAR SIEVE is a synthetic hydrated aluminosilicate (zeolite) or natural zeolite that has the function of screening molecules. It has many neatly arranged pores with uniform pore size in structure.
Molecular sieves with different pore sizes can separate molecules of different sizes and shapes. The typical models includs 3A (potassium A type), 4A (sodium A type), 5A (calcium A type), 10X (calcium X type), 13X (sodium X type), Y (sodium Y type), etc. It has high adsorption capacity, strong selectivity and high temperature resistance. It is widely used in organic chemical industry and petrochemical industry, and is also an excellent adsorbent for gas dehydration and purification.
Adsorption: the adsorption of zeolite molecular sieve is a physical change process. The main reason for the adsorption is a kind of "surface force" produced by the molecular gravity causing molecular concentration on the surface. After driving away the molecules concentrated on the surface, the zeolite molecular sieve has adsorption capacity again. This process is the reverse process of adsorption, called regeneration.
Ion Exchange: ion exchange refers to the exchange of compensation cations outside the framework of zeolite molecular sieve. Ions are easier to migrate under certain conditions, such as aqueous solutions or higher temperatures. Through ion exchange, the pore size of the zeolite molecular sieve can be changed, thereby changing its performance and achieving the purpose of shape-selective adsorption and separation of the mixture.
Catalytizing: zeolite molecular sieves have a unique regular crystal structure, each of which has a pore structure of a certain size and shape, and has a large specific surface area. Most zeolite molecular sieves have strong acid centers on the surface, and there is a strong Coulomb field in the crystal pores for polarization. These characteristics make it an excellent catalyst.