CO2 Capture Exploration on Potassium Hydroxide Employing Response Surface Methodology, Isotherm and Kinetic Models

In this research, KOH has been evaluated as a solid adsorbent for carbon dioxide (CO2) capture. The effect of pressure, temperature, and KOH loading on CO2 adsorption in a fixed-bed reactor were investigated. Response Surface Methodology (RSM) based on the central composite design (CCD) was used to evaluate the effects of operating parameters on adsorption capacity in order to achieve the optimum conditions. The experimental values of the responses were in decent agreement with the predicted result of regression models. Techniques such as Fourier Transform InfraRed (FT-IR) spectroscopy and X-ray diffraction (XRD) were used to study the consider KOH sorbent. The results show that CO2 adsorption is improved with the loading of 0.5 g of KOH. The maximum CO2 adsorption capacity was acquired for KOH at temperature 45°C and pressure 6 bars. The Freundlich model was found to be the best for fitting the adsorption of CO2 owing to the closeness of the R2 to unity. Furthermore, the kinetic study specified that the first-order model is well-fitted with the experimental data. Overall, the very high surface area of KOH adsorbent makes this adsorbent new promising material for CO2 capture.