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Activated carbon; For the purification of air streams containing odours or toxic gases and vapors, activated carbon filters are applied. The performance of activated carbon is based on the principle of adsorption and chemical sorption. In particular hydrocarbons (VOC`s) are trapped by adsorption. These molecules bind through vanderWaals forces to the activated carbon. The porous structure of activated carbon has a very large contact area and hence high gas adsorption capacity.
Chemisorption
Substances other than hydrocarbons are mostly captured by means of chemi-sorption. In that case, activated carbon is impregnated with chemicals and the molecules in the gas or vapour reacts with these chemicals and remain captured in the activated carbon.
Because dust distorts the functionality of activated carbon, it is necessary to place a dust filter in front of the activated carbon bed.