Vapor adsorption on coal- and wood-based chemically activated carbons -: (III) -: NH3 and H2S adsorption in the low relative pressure range

NH3 and H2S adsorption studies on coal- and wood-based chemically activated carbons were carried out at room temperature using a gravimetric adsorption technique. The adsorption capacity of NH3 and H2S in the very low relative pressure range was independent of the surface area development, Activated carbons with lower surface area generally adsorbed more of these vapors than those with higher surface area. This can be attributed to the presence of smaller average micropore sizes and a greater number of active adsorption sites on the low surface area chemically activated carbons. (C) 1998 Elsevier Science Ltd. All rights reserved.