Abstract
Sustainable carbon adsorbents have been produced from biomass residues by single-step activation with CO2. The activation conditions were optimised to develop narrow micropores in order to maximise the CO2 adsorption capacity of the carbons under post-combustion conditions. The equilibrium of adsorption of pure CO2 and N2 was measured between 0°C and 50°C up to 120kPa for the outstanding carbons. The CO2 adsorption capacity measured at low pressures is among the highest ever reported for carbon materials (0.6–1.1mmolg−1 at 15kPa and 25–50°C), and the average isosteric heat of adsorption is typical of a physisorption process: 27kJmol−1. Dynamic experiments carried out in a fixed-bed adsorption unit showed fast adsorption and desorption kinetics and a high CO2-over-N2 selectivity. These adsorbents are able to separate a mixture with 14% CO2 (balance N2) at 50°C, conditions that can be considered as representative of post-combustion conditions, and they can be easily regenerated.
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