Ammonia modified biomass-based carbons as CO_2 adsorbents

摘要

In this work a nitrogen enriched activated carbon has been obtained from a biomass residue, almond shells, by a first step of carbonisation followed by a second step of heat treatment with ammonia gas at 800 °C. The prepared carbon presented 4.5 wt.% of nitrogen and a total pore volume of 0.26 cm~3 g~(-1), mostly in the micropore domain. The adsorption capacities of CO_2 and N_2 at 30 °C were compared to those of a commercial activated carbon used to adsorb CO_2 in cold warehouses, obtaining similar results.