1. Basic Properties
Molecular sieves are crystalline porous materials with regularly distributed, uniform nano-scale micropore channels inside. Compared with ordinary porous materials, they feature precisely controllable pore sizes and robust structural stability. With outstanding thermal and hydrothermal resistance, they can sustain long-term continuous industrial operation. Integrating molecular sieving, selective adsorption, ion exchange and catalysis as one multifunctional material, molecular sieves serve as essential base materials for chemical, energy and environmental protection industries.
2. Core Functions
Molecular sieves deliver reliable molecular sieving performance. Thanks to fixed pore dimensions, they realize selective separation based on molecular size: small molecules diffuse into pore channels and get adsorbed, while large molecules are blocked, achieving material purification and component separation. In addition, the polar framework of molecular sieves generates stronger adsorption affinity toward polar substances such as water and acid gases, making them suitable for deep drying and purification of various medium systems.
Modification via ion exchange allows adjustment of pore size, surface acidity and adsorption capacity to match diverse process requirements. Modified molecular sieves form stable active sites and exhibit superior shape-selective catalysis, directing chemical reactions toward target products, lowering byproduct generation and improving raw material conversion efficiency and product selectivity. Coke accumulated on catalyst surfaces during industrial service can be eliminated through high-temperature regeneration, enabling recyclable use of the material.
3. Main Application Fields
In petrochemical industry, molecular sieves act as core catalysts for catalytic cracking, hydrocarbon isomerization and oil upgrading processes, widely applied in heavy oil lightening and finished gasoline quality improvement. In coal chemical industry, their excellent shape-selective catalytic property supports key processes including methanol-to-olefin for manufacturing fundamental chemical feedstocks.
For gas treatment, molecular sieves function as primary adsorbents for deep dehydration of industrial gas, CO₂ and sulfide removal, as well as air oxygen-nitrogen separation in gas refining workflows.
In environmental protection, they adsorb and catalytically decompose volatile organic compounds for industrial flue gas purification to meet emission standards, playing a vital role in clean production and clean energy development.