What is ZSM-5 molecular sieve？
ZSM-5 molecular sieve is a synthetic zeolite-type molecular sieve with unique three-dimensional pore structure and regular cage structure. Due to its excellent physicochemical properties, ZSM-5 molecular sieve has a wide range of applications in many fields.
I. Synthesis and properties
The synthesis of ZSM-5 molecular sieve usually adopts hydrothermal synthesis method, taking sodium silicate, sodium aluminate, sodium carbonate and other raw materials, and is generated through crystallisation reaction under high temperature and high pressure conditions. The key factors of synthesis include raw material proportion, reaction temperature, reaction pressure, crystallisation time and crystallisation temperature.
ZSM-5 molecular sieve has a high SiO2/Al2O3 ratio, low sodium content and regular cage structure, which gives it excellent physicochemical properties. Its crystal structure consists of silica-oxygen tetrahedra and aluminium-oxygen tetrahedra, forming straight-through three-dimensional pores and dodecahedral ring orifices, which results in high adsorption capacity, low abrasiveness and excellent resistance to high temperatures.
Second, application areas
1. Petrochemical industry: ZSM-5 molecular sieve as catalyst can be used in catalytic cracking, isomerisation, alkylation, disproportionation and other reactions to improve the quality and yield of petroleum products. Meanwhile, ZSM-5 molecular sieve can also be used in dewaxing, lubricant refining and other processes.
2. Environmental protection field: ZSM-5 molecular sieve can be used to remove harmful substances in exhaust gas, such as SO2, NOx, etc. It can also be used in wastewater treatment and soil remediation.
3. Pharmaceutical and chemical industry: ZSM-5 molecular sieve also has a wide range of applications in the pharmaceutical and chemical industry, such as synthetic drugs, chiral splitting, separation and purification.
4. Catalyst carrier: ZSM-5 molecular sieve has excellent thermal and hydrothermal stability, and can be used as a carrier for catalysts, such as automobile exhaust catalysts, fuel cell catalysts and so on.
5. High-performance materials: ZSM-5 molecular sieves can be used as high-performance materials, such as adsorbents, ion exchangers, catalyst carriers and so on.
In conclusion, as an important zeolite-type molecular sieve, ZSM-5 molecular sieve has a wide range of applications in many fields due to its unique structure and excellent physicochemical properties. With the continuous progress of science and technology and the growing market demand, the application prospect of ZSM-5 molecular sieve will be more broad.