Classification and characteristics of molecular sieve catalysts

Classification and characteristics of molecular sieve catalysts

They are divided according to the size of the pores, and there are smaller than 2 nm, 2-50 nm and larger than 50 nm, which are called microporous, mesoporous and macroporous respectively.

They can be divided into three categories according to the pore size: microporous, mesoporous and macroporous

Microporous kinds have the advantages of strong acidity, high hydrothermal stability, and special "shape-selective catalysis" performance, but they also have shortcomings such as narrow pore size and large diffusion resistance, which greatly limit their application in macromolecular catalytic reactions.

Mesoporous kinds have the characteristics of high specific surface area, large adsorption capacity, and large pore size, which solve the problem of mass transfer and diffusion to a certain extent, but their weak acidity and poor hydrothermal stability limit their industrial applications.

In order to solve the above problems, researchers have developed a multi-level porous molecular sieve, which combines the advantages of mesoporous and microporous kinds and has immeasurable application prospects in the petrochemical field.