The difference between aluminum silica gel and ws aluminum silica gel - I

The core difference between ordinary silica-alumina gel and water-resistant silica-alumina gel lies in the composition structure, water resistance and application scenarios. The following is a specific comparison:

1. Composition and structure

Ordinary silica-alumina gel:

The gel structure formed by the condensation reaction of silicic acid (SiO₂·nH₂O) and aluminate (Al₂O₃), with the chemical formula of mSiO₂·nAl₂O₃·xH₂O. It is transparent or translucent granular, with high porosity but relatively loose structure.

Water-resistant silica-alumina gel:

Based on ordinary silica-alumina gel, a denser gel network is formed by optimizing the silicon-aluminum ratio (such as SiO₂ accounts for about 97%, Al₂O₃ accounts for about 3%) and pore distribution. Some products may add hydrophobic groups or perform surface modifications to further block water penetration.

2. Water resistance

Ordinary silica-alumina gel:

When exposed to water or high humidity, the gel structure may partially collapse due to hydrolysis, resulting in a decrease in adsorption and pulverization of particles. Long-term contact with liquid water is prone to loss of activity and requires frequent regeneration or replacement.

Water-resistant silica-alumina gel:

Structural stability: compressive strength ≥80N/particle, water-resistant cracking rate ≥90%, can withstand liquid water impact without breaking.

Adsorption durability: maintain stable adsorption in humidity cycles (such as RH=10%→80%), and higher performance recovery rate after regeneration.

Chemical stability: insoluble in water and inorganic acids (except hydrofluoric acid and concentrated alkali), suitable for complex working conditions.