ZSM-5 zeolite used in petrochemical catalysis fields

ZSM-5 zeolite has a special three-dimensional pore structure and acid sites that can be continuously adjusted and changed.

So it is an important shape-selective zeolite material. However, the traditional ZSM-5 zeolite is limited by its micro-pore size, 

which will affect the macromolecules entering the micro-pore channels for reaction, 

and will also increase the diffusion resistance of some macromolecular reactants and products in the molecular sieve channels. , 

resulting in the processing of some petrochemical catalytic reactions, the ZSM-5 zeolite will be affected by carbon deposition, 

resulting in lower processing efficiency.

Faced with this problem, researchers usually optimize the synthesis method to process ZSM-5 zeolite with mesoporous molecular sieve 

or prepare nano-scale ZSM-5 zeolite, but combined with practical application, nano-ZSM-5 zeolite has thermal stability.

Due to problems such as poor hydrothermal stability and difficult separation, the preparation of hierarchically porous 

ZSM-5 zeolite molecular sieves has become the most effective method at present.

The hierarchically porous ZSM-5 zeolite molecular sieve can effectively retain the adjustable acidity, hydrothermal stability and other advantages of the microporous molecular sieve, and can also introduce some mesopores through the zeolite molecular sieve to overcome the limitations of the zeolite itself, which is easy to transfer mass and diffuse. Therefore, it is currently widely used in different petrochemical catalysis fields.