关键词: 多孔炭, 二氧化碳捕集, 碱式碳酸镁, 吸附, 多孔介质, 动态穿透

Abstract:

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.

Key words: porous carbon, CO₂ capture, basic magnesium carbonate, adsorption, porous media, dynamic breakthrough