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5A Molecular Sieve with Excellent Water Adsorption

  5A molecular sieve is an artificially synthesized alkali metal aluminosilicate with a pore size of 5A (about 0.5 nanometers) and a chemical formula of 3/4CaO·1/4Na₂O·Al₂O₃·2SiO₂·9/2H₂O. With its unique pore structure and surface chemistry, 5A molecular sieve has shown outstanding performance in the fields of gas drying, liquid purification and separation, especially in water absorption performance. The following analyzes its technical characteristics from four aspects: adsorption mechanism, performance advantages, industrial applications and regeneration technology.

Molecular Sieve Zeolite for Psa Oxygen Concentrator
 

一、The core mechanism of water absorption performance

1、Selective adsorption of pore size

The pore size of the 5A molecular sieve is precisely matched with water molecules (kinetic diameter about 0.26 nanometers), allowing them to freely diffuse into the pores, while blocking molecules with diameters greater than 0.5 nanometers (such as hydrocarbons above C3). This "molecular sieving" effect allows it to preferentially adsorb water in the mixed gas, achieving deep dehydration.

2、Polar interaction

The aluminum-oxytetrahedron in the aluminosilicate framework is negatively charged and forms strong electrostatic attraction with water molecules (polar molecules). Experimental data show that the adsorption heat of 5A molecular sieve to water reaches 50-60 kJ/mol, which is much higher than the typical value of physical adsorption (20-40 kJ/mol), indicating a significant contribution of chemisorption.

3、High specific surface area and pore volume

The specific surface area of ​​5A molecular sieve can reach 700-800 m²/g, and the pore volume is 0.3-0.4 cm³/g, providing a large number of adsorption sites for water molecules. Its three-dimensional pore structure promotes rapid mass transfer, and the adsorption of static water can reach 20%-22% of its own weight, far exceeding 3A (about 19%) and 4A molecular sieve.

  5A molecular sieve is an artificially synthesized alkali metal aluminosilicate with a pore size of 5A (about 0.5 nanometers) and a chemical formula of 3/4CaO·1/4Na₂O·Al₂O₃·2SiO₂·9/2H₂O. With its unique pore structure and surface chemistry, 5A molecular sieve has shown outstanding performance in the fields of gas drying, liquid purification and separation, especially in water absorption performance. The following analyzes its technical characteristics from four aspects: adsorption mechanism, performance advantages, industrial applications and regeneration technology.

Molecular Sieve Zeolite for Psa Oxygen Concentrator
 

一、The core mechanism of water absorption performance

1、Selective adsorption of pore size

The pore size of the 5A molecular sieve is precisely matched with water molecules (kinetic diameter about 0.26 nanometers), allowing them to freely diffuse into the pores, while blocking molecules with diameters greater than 0.5 nanometers (such as hydrocarbons above C3). This "molecular sieving" effect allows it to preferentially adsorb water in the mixed gas, achieving deep dehydration.

2、Polar interaction

The aluminum-oxytetrahedron in the aluminosilicate framework is negatively charged and forms strong electrostatic attraction with water molecules (polar molecules). Experimental data show that the adsorption heat of 5A molecular sieve to water reaches 50-60 kJ/mol, which is much higher than the typical value of physical adsorption (20-40 kJ/mol), indicating a significant contribution of chemisorption.

3、High specific surface area and pore volume

The specific surface area of ​​5A molecular sieve can reach 700-800 m²/g, and the pore volume is 0.3-0.4 cm³/g, providing a large number of adsorption sites for water molecules. Its three-dimensional pore structure promotes rapid mass transfer, and the adsorption of static water can reach 20%-22% of its own weight, far exceeding 3A (about 19%) and 4A molecular sieve.