Silica gel

Silica gel is composed of SiO2 units with high porosity. Silica gel is a three-dimensional polymer composed of four-dimensional silicon dioxide units. It is a porous material. Silica gel is a suitable adsorbent for water, alcohol, nols, amines, and so on. That does this through hydrogen bonds. The adsorption capacity of silica gel at low temperatures is higher than that of alumina and zeolite; however, if the moisture content is low, it is less adsorbent than zeolite. In contrast, silica gel is easier to reduction can be heated to as low as 150°C, while zeolite must be heated to about 350°C. Due to these properties, silica gel is used in environments where a low temperature, moderate water vapor pressure, and high adsorption capacity are required. Silica gel is a porous, amorus form and is composed of SiO2. Due to its unique internal structure, silica gel is radically different to other SiO2-based materials. It has a network of interconnected pores and channels.