High performance of zeolite molecular sieves used in industrial catalysis is the basic requirement and goal .

High performance of zeolite molecular sieves used in industrial catalysis is the basic requirement and goal High-efficiency catalysis of zeolite molecular sieves is very important.The type and number of active centers of catalytic materials, as well as the micropore diffusion performance are the intrinsic factors that affect their catalytic activity. Catalysis Selectivity is closely related to the shape selectivity of micropore channels, the occurrence of side reactions, and the diffusion speed of each reaction molecule. Lifetime has always been an important indicator to measure the performance of catalytic materials. How to prolong the life of the catalyst as much as possible is the catalytic process. The eternal topic of . On the premise that the catalyst activity meets the requirements, deactivate the catalyst

If it is easy to regenerate and the structure can be recovered, that is, it can be regenerated repeatedly, and then with a suitable reaction process, the purpose of prolonging the life of the catalyst will be achieved. Therefore, high performance not only puts forward higher requirements for zeolite molecular sieve materials, but also requires catalytic materials and reaction process

The multi-scale combination and coordination of the process system will ultimately enable the catalyst to achieve high performance in industrial applications.

In the following, industrial molecular sieve catalysts for (MTO) reactions are discussed in terms of grain size and shape control, efficient utilization of molecular sieve channels, and surface modification and functionalization of molecular sieves.

The effect of SAPO-34 molecular sieve on the olefin yield and catalyst life. It was found that the particle morphology of the molecular sieve had a great influence on the catalytic performance. The molecular sieve with flakes and small grains had a higher olefin yield than the one with large grains. Slow deactivation rate. So-called "multilayer" and "monolayer" MFI nano-zeolite sheets were successfully synthesized with diquaternary ammonium cationic surfactant. greatly reduced. However, small-grained or nano-zeolites were synthesized and used.

There are still many problems, such as they are easy to agglomerate during synthesis, and the composition and reaction conditions of the synthesis system need to be strictly controlled. In addition, agglomeration often occurs during post-processing such as drying and high-temperature calcination, which usually reduces the efficiency of nano-zeolites. . The synthesis of nano-zeolite often requires a large amount of expensive structure-directing agents, resulting in low synthesis efficiency and a corresponding increase in cost. In addition, in the use of nano-zeolite, especially in the liquid reaction system, the catalyst and product It is not easy to separate, which is not conducive to the recycling of the catalyst. The above problems are all problems that need to be solved for the further application of small-grained or nano-zeolite.