An inexpensive K-Fe-based. sorbent using K2CO3 and nanoporotis FeOOH was developed, and its CO2 separation performance was investigated in a fixed-bed tube reactor under differing conditions. Because of its high surface area and porous structure, FeOOH can increase CO2 capture capability by more than 70 times compared to pure K2CO3. The sorption capacity of the K-Fe sorbent reaches its peak when its K2CO3 content is 33.33 wt %, under the tested sorption conditions. The CO2 sorption capacity of the sorbent increases with an increase of moisture in gas but decreases dramatically with the, elevation of the sorption temperature. The total CO2 capture capability of the K-Fe sorbent is similar to 49 mg of CO2/g of sorbent at 60 degrees C in a 10 vol % moisture. environment. The sorbent is regenerable, and its multicycle sorption capacity remains at similar to 30 mg of CO2/g of sorbent When the regeneration temperature is 125 degrees C. Catalysis plays an important role in improving CO2 desorption, thug reducing the energy required for the CO2 separation technology.