Isotherm and Thermodynamic Analysis of Carbon Dioxide on Activated Carbon

详细信息    查看全文

• 作者：Nor Adilla Rashidi ; Suzana Yusup ; ^{drsuzana_yusuf@petronas.com.my" class="auth_mail" title="E-mail the corresponding author} ; Azry Borhan
• 关键词：Activated carbon ; CO2 adsorption ; Isotherm ; Physisorption ; Thermodynamics
• 刊名：Procedia Engineering
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：148
• 期：Complete
• 页码：630-637
• 全文大小：400 K

文摘

In this study, commercial Norit® SX2 activated carbon has been evaluated as a solid adsorbent for carbon dioxide (CO₂) capture at the post-combustion conditions, which are at an ambient pressure and low temperatures (< 120^oC). The CO₂ equilibrium adsorption capacity is assessed through a static volumetric technique. This solid adsorbent is characterized in terms of elemental analysis, nitrogen physisorption, as well as surface morphology. The CO₂ adsorptive property of the commercial Norit® SX2 demonstrates a reduction in the amount of CO₂ adsorbed at an elevated temperature, and accordingly, it indicates that CO₂ adsorption is a physical adsorption process and demonstrates a behavior of an exothermic reaction, which consistent with the thermodynamics analysis. Different isotherm models are applied to mathematically model the CO₂ adsorption, and on basis of the regression coefficient (R²), the Freundlich model provides a perfect fit to the experimental data, owing to closeness of the R² to unity. The result obtained in this study can serve as a benchmark while searching for inexpensive and superior activated carbon production in future studies.