Will Nay molecular sieve be affected by temperature changes?

Will Nay molecular sieve be affected by temperature changes?

In the synthesis of molecular sieves, the template or structure directing agent is located in the pores or cages of the molecular sieve, which plays a vital role in the formation of a molecular sieve with a specific pore structure. In recent years, the types of structure-directing agents used in the synthesis of molecular sieves have become more and more abundant, such as various organic amines, quaternary ammonium salt cations, metal complexes, quaternary phosphazenes and proton sponges. The structure-directing agent mainly plays a role in the formation of specific holes or cage-like structures: ①Space filling function; ②Structural guidance function; ③Template function. Take AIPO4-5, EMT and ZSM-18 as examples to illustrate these three functions.
 
Molecular sieve has strong moisture absorption capacity and can be used for gas purification treatment. Avoid direct exposure to air during storage. Molecular sieves that have been stored for a long time and have absorbed moisture should be regenerated before use. Molecular sieve avoids oil and liquid water. Try to avoid contact with oil and liquid water when in use. Activated alumina balls are mainly used for the dehydration and drying of industrial gases such as chemistry, metallurgy, electronics and petroleum, such as permanent gas smelting gases such as air, oxygen, nitrogen and petroleum cracking gas.
 
Adsorption under low partial pressure or low concentration: When the relative humidity is 30%, the water absorption rate of molecular sieve is higher than that of silica gel and activated alumina. With the decrease of relative humidity, the superiority of molecular sieve becomes more and more obvious, while the adsorption capacity of silica gel and activated alumina increases with the increase of humidity. When the relative humidity is very low, their adsorption capacity is very small.
 
The water purification effect of high-efficiency molecular sieve will be affected by temperature. High temperature and high turbidity have less impact, while low temperature and low turbidity have a greater impact. When the temperature reaches 10°C, the adsorption is affected. From the internal structure analysis, when the temperature is 15-25℃, the molecular structure of the high-efficiency molecular sieve is the most stable. When the temperature drops below zero, the molecules begin to flow. The suspension of activity will also affect the purification effect of the molecular sieve. The most direct manifestation is that the adsorption effect is not obvious, and it is difficult to form alum, which further affects its deposition. In winter, when the temperature is very low and drops below zero, high-efficiency molecular sieves are difficult to play a role.