Open Access
Subscription Access
Impregnated Palm Kernel Shell Activated Carbon for CO2 Adsorption by Pressure Swing Adsorption
Objectives: To study the application of impregnated palm kernel shell activated carbon (AC-PKS) as carbon dioxide (CO2) adsorbent for simulated coal-fired power flue gas. Methods/Statistical Analysis: The activated carbon was prepared using chemical (ZnCl2) activation method and impregnated with several types of metal oxides (Cerium, Barium and Titanium). The physico-chemical properties of PKS-ACs such as BET surface area, pore volume, and pore diameter were performed using N2 adsorption isotherm. Both loaded and unloaded ACs were also characterized using X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The adsorption of CO2 from the simulated flue gas was investigated by pressure swing adsorption process in fixed-bed reactor. Findings: AC-PKS impregnated with Cerium Oxide (CeO2) showed the highest sorption capacity of CO2 among other impregnated metal oxides. AC-PKS/CeO2 also displayed the longest breakthrough time of 350 seconds for CO2 with 0.63 mole CO2/kg AC. The CO2 adsorption capacity of AC-PKS, ACPKS- TiO2, PKS-AC/BaO and AC-PKS/CeO2 until complete saturation, were at 0.54 mole CO2/kg AC, 0.78 mole CO2/kg AC, 1.37 mole CO2/kg AC and 1.41 mole CO2/kg AC, respectively. During the desorption process, 99% of CO2 can be recovered and under 2 bar, 3 bar and 4 bar, the purity of CO2 was 25%, 36% and 38%. Interestingly, the purity increased to 93% when purging step with CO2 was added. Application/Improvements: This system will be implemented to capture CO2 from flue gas emissions from coal based power plant.
Keywords
Adsorption, CO2, Metal Oxides, Palm Kernel Shell Activated Carbon
User
Information
Abstract Views: 237
PDF Views: 0