Activated coke

Activated coke is a carbon-based adsorbent that is usually obtained from brown or hard coal. It is mainly used for exhaust gas cleaning.

Activated coke is obtained through the pyrolysis of brown or hard coal with subsequent thermal activation. Compared to activated carbon , activated coke has a lower specific surface and a different pore size distribution; the volume of micropores is lower, whereas activated coke has two frequency peaks for meso- and macropores. It is characterized by a pore volume of less than 25 cubic centimeters per 100 grams and a specific surface area of ​​less than 400 square meters per gram. Due to its pore distribution, activated coke is well suited to separate polychlorinated dibenzodioxins and dibenzofurans (PCDD / F) .

Activated coke is often used when the adsorbent cannot be regenerated. It is often processed with hydrated lime to make so-called mixed sorbents.

literature

• Margit Löschau: Cleaning exhaust gases. TK Verlag Karl Thomé-Kozmiensky, 2014, ISBN 978-3-944310-13-8 , pp. 209-211.
• VDI 3674: 2013-04 Exhaust gas cleaning through adsorption; Process gas and waste gas cleaning (Waste gas cleaning by adsorption; Process gas and waste gas cleaning). Beuth Verlag, Berlin. ( Summary online , table of contents and scope )