Development of New Potassium Carbonate Sorbent for CO2 Capture under Real Flue Gas Conditions

In this paper, the development of a new potassium carbonateon alumina support sorbent prepared byimpregnating K2CO3 with an industrial grade of Al2O3 support was investigated. The CO2 capturecapacity was measured using real flue gas with 8% CO2 and 12% H2O in a fixed-bed reactor at atemperature of 65 °C using breakthrough curves. The developed sorbent showed an adsorptioncapacity of 66.2 mgCO2/(gr sorbent). The stability of sorbent capture capacity was higher than thereference sorbent. The SO2 impurity decreased sorbent capacity about 10%. The free carbon had asmall effect on sorbent capacity after 5 cycles. After 5 cycles of adsorption and regeneration, thechanges in the pore volume and surface area were 0.020 cm3/gr and 5.5 m2/gr respectively. Smallchanges occurred in the pore size distribution and surface area of sorbent after 5 cycles.

Keywords:

Flue Gas , CO2 Capture , K2CO3/Al2O3 , Solid Sorbent