Synthesis and Preparation of ZSM-5 series zeolite
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ZSM-5 series 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 series zeolite is limited by its micro-pore size, so it will affect the macromolecules entering the micro-pore channels for reaction, and at the same time, it will also increase the diffusion resistance of some macromolecular reactants and products in the molecular sieve channels. Large, resulting in some petrochemical catalytic reaction processing, ZSM-5 series zeolite will be affected by carbon deposition, resulting in lower processing efficiency.
Faced with this kind of problem, researchers usually process the mesoporous molecular sieve of ZSM-5 series zeolite or prepare nano-scale ZSM-5 series zeolite by optimizing the synthesis method. The stability and hydrothermal stability are poor and the separation is difficult. Therefore, the preparation of ZSM-5 series zeolite molecular sieves with multi-level pores has become the most effective method at present.
The hierarchically porous ZSM-5 series zeolite molecular sieve can effectively retain the adjustable acidity and hydrothermal stability of the microporous molecular sieve, and can also introduce some mesopores through the zeolite molecular sieve to overcome the zeolite itself, which is easy to transfer mass and diffuse. Therefore, it is currently widely used in different petrochemical catalysis fields.
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