For half a century, molecular sieves have played an increasingly important role in petroleum processing, petrochemical and fine chemicals, and environmental chemicals as the three main application fields of catalytic materials, adsorption and separation materials and ion exchange materials. Nevertheless, the role of molecular sieves in the above three traditional fields has great development prospects. First, there are 213 types of molecular sieves with known structures up to now (2013), and they are derived from the diversity of component elements and framework structures. Look, there is still a lot of room for development. However, up to now, it has been used in industrial scale A, X and Y faujasite, mordenite, ZSM-5, ZSM-11, MCM-22, L, B, erionite, RHO, CHA, There are less than twenty types of AEL and TS, as well as SAPO-34, SAPO-11, SAPO-31, etc.
It is speculated that in the next twenty years, due to the large-scale development of fine chemicals and intermediate chemicals, as well as the renewal and development of traditional applications in petroleum processing, petroleum processing and coal chemical industries, the application of molecular sieves in catalytic and adsorption separation will be further promoted. Great development in the field.
Secondly, in the past 20 years, due to the development of new catalytic fields of molecular sieves, such as basic catalysis of molecular sieves, microporous molecular sieve catalysis, redox catalysis and chiral catalysis of molecular sieves, as well as the rise of microporous hierarchical pore composite materials, double Functional and even multifunctional molecular sieve catalysts. This will provide a strong foundation for the further development of molecular sieve in the field of catalysis and adsorption separation.
Thirdly, due to the diversity and controllability of the above-mentioned structures and properties, a large number of advanced functional materials based on microporous materials have been developed and developed on this basis. The most important thing is the development of advanced functional materials based on microporous host and guest. .
According to the different assembled guest materials, microporous host-guest composite materials can be divided into the following four categories. It is a composite system composed of a porous body and a metal or metal cluster; a class is a composite material formed by a porous body, a polymer and a carbon material, where the carbon material includes carbon nanotubes and fullerenes; the third type is mainly composed of a porous body Host-guest composite materials composed of functional nanoparticles such as inorganic semiconductors formed in pores or cages; the fourth category is host-guest materials formed by porous hosts and organic molecules, metal complexes, cluster compounds, supramolecular drug molecules, etc. Taking into account the pore size of the host material, the size and properties of the guest molecule, people have developed different methods of assembly, grafting, anchoring, loading, etc. to prepare and synthesize a large number of composite guest materials with specific properties, and their specific aggregation states such as various Function and type of film, nanometer state, morphology and perfect crystal. These materials use the functions of highly dispersed guest species, or the synergistic effects of host and guest species, to develop and open up a large number of specific functions, and form a field with important development prospects.