The role of zeolite molecular sieves

The zeolite molecular sieves is heated to about 200 ℃ water to evaporated, to obtain activated zeolite, porous sponge is formed, so that the cation exchange properties of adsorption and to play. And when the water is heated to escape, more open channels and cavities, corresponding to greater internal surface area, and inside the zeolite crystal cave after dehydration with strong Coulomb field and polarity, plus dispersion forces and static electricity and makes zeolite showed a strong adsorption.
3a zeolite molecular sieves has a high temperature properties, but the temperature is too high will destroy its structure so that it loses ion exchange. Under normal circumstances, the ignition 500 ℃ ~ 550 ℃ can improve the mechanical strength of the pore volume can be increased to increase the specific surface area, but also increase locomotor activity cation ion exchange is more fully.
Depends on the thermal stability of the natural zeolite of silicon, aluminum, and the balance 13x zeolite molecular sieves cation ratio, generally within the range of variation in the composition, the high silicon content, the better the stability. Some changes in the balance of cationic nature, for the stability of the crystals have a significant impact, such as calcium-based natural clinoptilolite can decompose below 500 ℃, if the same sample with potassium ion exchange, it is still crystal temperature of 800 ℃ destruction.