Chemical adsorption is the transfer, exchange or sharing of electrons between an adsorbate molecule and a solid surface atom (or molecule) to form an adsorption chemical bond. Due to the uneven force field on the solid surface, the atoms on the surface often have the remaining bonding ability. When the gas molecules collide on the solid surface, electrons exchange, transfer or share with the surface atoms to form an adsorption bond. effect.

Typical desiccants of chemical absorption are 

1. calcium chloride desiccant 

2. magnesium chloride desiccant

3. quicklime desiccant, lime desiccant 

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