Abstract Low-cost regenerable MgO-based sorbents were prepared by partial calcinations of dolomite followed by impregnation with a potassium-based salt.  The sorbents have high reactivity and good capacity toward CO2 absorption in the temperature range of 300� to 450�C at 20 atm. and can be easily regenerated at 500�C.  Furthermore, the sorbents were shown to have lower attrition index than the FCC catalysts, making them suitable for removing CO2 from in gasification-based processes such as Integrated Gasification Combined Cycle (IGCC) in moving bed or fluidized bed reactors.  The reaction appears to be first order with respect to CO2 concentration with an activation energy of 44 kJ/mole.  The reactivity and the absorption capacity of the sorbents increase with increasing temperatures, as long as the partial pressure of CO2 is above the equilibrium value for sorbent carbonation.  A two-zone expanding grain model, consisting of a high-reactivity outer shell and a low-reactivity inner core is shown to provide an excellent fit to the TGA experimental data on sorbent carbonation at various operating conditions.

High temperature CO<sub>2</sub> capure in IGCC processes

243rd National Meeting (2012)

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High temperature CO2 capure in IGCC processes

High temperature CO₂ capure in IGCC processes