The selective separation of CO2
from gas mixtures representative of flue gas generated in waste incineration systems is studied on two activated carbons obtained from pine sawdust and compared to a commercial activated carbon. Dynamic adsorption experiments were conducted in a fixed-bed adsorption column using a binary mixture (N2
) with a composition representative of incineration streams at temperatures from 30 to 70 °C. The adsorption behavior of humid mixtures (N2
O) was also evaluated in order to assess the influence of water vapor in CO2
adsorption at different relative humidity in the feed gas: 22% and 60%. Moreover, CO2
adsorption was studied in less favorable conditions, i.e., departing from a bed initially saturated with H2
O. In addition, the effect of CO2
O adsorption was examined.
Experimental results showed that the CO2
adsorption capacity can be reduced significantly by the adsorption of H2
O (up to 60% at high relative humidity conditions). On the other hand, the breakthrough tests over the adsorbent initially saturated with water vapor indicated that H2
O is little affected by CO2
adsorption. The experimental results pointed out the biomass based carbons as best candidates for CO2
separation under incineration flue gas conditions.