These series of activated carbo are made from coal.
?The activated carbon?processes are accomplished by using one combination of the following steps:
1.) Carbonization: Material with carbon content is pyrolyzed at temperatures in the range of 600–900℃, in absence of oxygen (usually in inert atmosphere with gases like argon or nitrogen).
2.)Activation/ Oxidation: Raw material or carbonised material is exposed to oxidizing atmospheres (carbon monoxide, oxygen, or steam) at temperatures above 250℃, usually in the temperature range of 600–1200 ℃.