Carbonization is thermal decomposition and condensation polymerization of organic. At high temperature, hydrogen and oxygen in organic are decomposed while remaining carbon forms graphitization.
Activation is to remove any impurity in pore space with steam and chemicals, which is caused by carbonization. It helps to improve pore space or surface for better adsorption capacity.
1. Physical Activation
Also named gas activation, carbon is treated at high temp(800-950?) with steam, CO2 or air for oxidation of internal pore to make pore space.
2. Chemical Activation
It makes carbonization and activation at the same time in way of mixing carbon and activating agent. This is helpful to reduce by-product but contamination and recovery of chemical activating agent should be considered. The common agent are ZnCl and H3PO4..
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