Suitability of a Solid Amine Sorbent for CO2 Capture by Pressure Swing Adsorption

This study showed that a solid amine, composed of poly(ethylenimine) immobilized into a CARiACT G10 silica substrate, is a feasible sorbent for applications in a pressure swing adsorption (PSA) process for postcombustion CO2 capture. This deduction materialized from an extensive study of the behavior of this material over a wide range of industrially relevant conditions using thermogravimetric analysis. The temperature ranged from 40 to 100 °C, the CO2 partial pressure ranged from 1.2 to 100 vol % with the total pressure fixed at 1 atm, the relative humidity ranged from dry conditions to 2 vol %, and the number of consecutive adsorption and desorption cycles ranged from 4 to 76. The results revealed that this solid amine sorbent was very stable under the conditions investigated. Water vapor at a low relative humidity exhibited only a minor and reversible effect on both the thermodynamics and kinetics of the CO2 uptake and release. The isothermal CO2 working capacity ranged between 0.25 and 2.8 mol/kg, inc...

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