Evaluation of ammonia modified and conventionally activated biomass based carbons as CO2 adsorbents in postcombustion conditions

摘要: Abstract Low cost carbons obtained from biomass residues, olive stones and almond shells, were evaluated as CO2 adsorbents in postcombustion conditions (low partial pressure). These prepared chars by means of two different methods: physical activation with amination. All the present a high adsorption capacity at 303 K, although developed shells show superior CO2/N2 selectivity (lower N2 adsorption) than those stones. In general, activated samples faster kinetics due to presence transport pores, they have lower densities. On other hand, aminated narrower porosities but higher volumetric capacities. Among studied, selected most promising adsorbent, their good kinetics. To assess performance these cyclic adsorption/desorption processes, basic two-step cycle configurations following regeneration strategies: temperature swing (TSA), vacuum (VSA) combination both (VTSA). Aminated showed no sign deactivation after 13 h continuous TSA cycling between 303 373 K, nor during VSA or VTSA cycling.