3A 4A 5A 13X Molecular Sieve Zeolite

Molecular sieve (also known as synthetic zeolite) is an aluminosilicate microporous crystal. It is a basic skeleton structure composed of silicon-oxygen and aluminum-oxygen tetrahedra, and metal cations (such as Na+, K+, Ca2+, etc.) exist in the crystal lattice to balance the excess negative charges in the crystal. The types of molecular sieves are mainly divided into: A type, X type, Y type and so on according to their crystal structure.

The main component of A-type molecular sieve is aluminosilicate, which is composed of silicon-oxygen and aluminum-oxygen tetrahedron to form an LTA-type skeleton structure, and the main crystal pore is an eight-membered ring structure. The main crystal pore diameter is 4A (1A=0.1nm), which is called 4A type (also known as nano-A type) molecular sieve; exchange Na+ in 4A molecular sieve with Ca2+ to form a 5A pore size, which is 5A type (also known as calcium type). A type) molecular sieve; exchange Na+ of 4A molecular sieve with K+ to form a pore size of 3A, which is 3A type (also known as potassium A type) molecular sieve.

The main component of X-type molecular sieve is aluminosilicate, which is composed of silicon-oxygen and aluminum-oxygen tetrahedron. The crystal structure is different (the ratio of silicon to aluminum is different), forming a molecular sieve crystal with a pore size of 9-10A, which is called 13X (also known as sodium X type) molecular sieve; Exchange Na+ in the 13X molecular sieve with Ca2+ to form a molecular sieve with a pore size of 8-9A Crystal, called 10X (also known as calcium X type) molecular sieve.

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