碱式碳酸镁催化酚醛聚合制备多孔炭及其CO_2吸附性能

利用碱式碳酸镁的催化功能及易分解特性,实现间苯二酚、甲醛的快速凝胶,炭化得到孔隙发达的整体式多孔炭(MCM-Mg),其轴向抗压强度达9.4 MPa。与普通碳酸盐催化的样品相比,MCM-Mg孔隙更为发达。273K下该系列样品的静态CO2吸附量可达3.49~4.50 mmol·g-1(0.1 MPa),0.015 MPa最高可达1.87 mmol·g-1。研究发现,微孔对材料吸附性能起主导作用;MCM-Mg的单位微孔比表面积可吸附7.15μmol CO2,超过了大部分活化法制备的炭材料。多组分动态穿透实验表明,该系列材料可实现CO2/N2的完全分离;材料具有良好的耐水汽性能和循环吸附-脱附性能,室温下经惰性气体吹扫即可实现再生。

Synthesis of porous carbon through polymerization catalyzed by basic magnesium carbonate and their CO2 adsorption performance

By taking the advantages of easy decomposition and catalytic function of basic magnesium carbonate, the mechanically stable porous carbon materials (MCM-Mg) are synthesized through rapid gelation of resorcinol with formaldehyde and subsequently carbonization. Compared with samples catalyzed by traditional carbonates, the synthesis process can obtain a well-developed porous structure. The resulted samples can withstand a pressure of up to 9.4 MPa. At 273 K, the equilibrium CO₂ adsorption capacities of MCM-Mg are in the range of 3.49-4.50 mmol·g^-1 at 0.1 MPa and can reach 1.87 mmol·g^-1 at 0.015 MPa. Experimental test of the MCM-Mg shows that the micropores play a major role in contribution of the amount of adsorbed CO₂. Importantly, MCM-Mg can adsorb 7.15 μmol CO₂ per S_micro, which surpasses most of the carbons prepared by activation. Dynamic breakthrough tests show that over such series of samples, CO₂/N₂ streams can be fully separated. The CO₂ release is achieved facilely in Ar purge at 298 K. The samples also exhibit stable performance for CO₂ separation under humid conditions and exhibit good regeneration capability.