Carbon dioxide adsorption/desorption performance of single- and blended-amines-impregnated MCM-41 mesoporous silica in post-combustion carbon capture

Abstract High-surface-area, hexagonal-structured mesoporous silica, MCM-41, was synthesized and wet impregnated with three different amines of 2-(ethylamino) ethanol (EAE), ethylenediamine (EDA), tetraethylenepentamine (TEPA) for use as solid adsorbents in post-combustion CO2 capture application. The adsorption test performed at 25°C atmospheric pressure using 15/85 vol% CO2/N2 a 20-mL/minute flow rate. Desorption carried out 100°C under 20 mL/minute N2 flow. results show that the capacity rate obtained from all amine-modified were significantly increased increasing amine loading due to carbamate formation. efficiency heat duty regeneration also affected by amount loading. more stable produced, higher energy required. They exhibited highest adsorption–desorption performance 60 wt% used impregnation. Blended EAE/TEPA weight ratios total concentration on MCM-41 adsorbent. Sorbent 50%/10% showed best 4.25 mmolCO2/g high rate, low 12 kJ/mmolCO2 9.4% reduction after five repeated cycles.