ABSTRACT

Calcium oxide incorporated porous carbon materials were synthesized by the impregnation method to study CO₂ adsorption and separation of CO₂/CH₄. The X-ray diffraction, Raman analysis, N₂ isotherms at 77 K, and SEM with EDX analysis were used to characterize synthesized materials. XRD and N₂ isotherm results have confirmed that synthesized carbon has porosity, and EDX analysis has reported that the presence of CaO on porous carbon. 10CaO/porous carbon has shown 31 cm³ g⁻¹ of CO₂ adsorption which was higher than bare porous carbon CO₂ adsorption 17.5 cm³ g⁻¹ at 298 K, 1 bar. It was attributed to electrostatic interaction between CaO and CO₂. However, CH₄ adsorption was decreased by a decrease in surface area. The selectivity of CO₂/CH₄ was higher for 10CaO/porous carbon and the heat of CO₂ adsorption was 36 KJ/mol at high adsorption of CO₂. Moreover, CO₂ adsorption was the same in each adsorption cycle.

摘要

采用浸渍法合成掺入氧化钙的多孔碳材料，研究CO ₂吸附分离CO ₂ /CH ₄。X 射线衍射、拉曼分析、77 K 的 N ₂等温线和带有 EDX 分析的 SEM 用于表征合成材料。XRD和N ₂等温线结果证实合成碳具有孔隙率，EDX分析报告称多孔碳上存在CaO。10CaO/多孔碳的CO _{2吸附量为31 cm} ³  g ^-1高于裸多孔碳CO ₂吸附量17.5 cm ³  g ^-1在 298 K，1 巴。_{这归因于CaO和CO 2}之间的静电相互作用。然而，CH ₄吸附因表面积的减少而减少。CO ₂ /CH ₄的选择性对10CaO/多孔碳较高，CO ₂吸附热在高吸附CO ₂时为36 KJ/mol 。此外，CO ₂吸附在每个吸附循环中是相同的。