381331 MgO-Based Sorbent Promoted with KNO3 for CO2 Capture at Medium Temperatures

Tuesday, November 18, 2014: 4:27 PM
310 (Hilton Atlanta)
Anh-Tuan Vu1, Keon Ho2 and Chang-Ha Lee2, (1)Chemical and Biomolecular, Yonsei University, Seoul, South Korea, (2)Chemical and Biomolecular Engineering, Yonsei University, Seoul, South Korea

The emission control and capture of CO2 are always being a most challenging environmental issue facing to each country in over the world. The CO2 capture at medium temperature (200-400oC) is one of important area in CCS technology because it can be applied to IGCC effluent gas without cooling step, sorption enhanced reaction or pre-combustion capture.  In this study, MgO was prepared by various synthesis methods of MgO (hydrothermal, polyol, aerogel methods) and the sorption capacity was compared by using sulfur compounds in gas mixture. The optimized MgO nanoparticle was used as a base material for CO2 capture. Then, the developed MgO-based sorbent was promoted by KNO3 to improve CO2 capture capacity at medium temperature range. MgO·KNO3 composites were synthesized using aerogel route and the CO2 sorption capacity of as-prepared composites was evaluated at the intermediate temperature range of 250-400ºC by using a TGA. Effects of MgO/KNO3 molar ratio and calcination method on CO2 sorption capacity were compared and their structural and physical properties were investigated by SEM, XRD and N2 adsorption/desorption isotherm. In addition, the sorption capacity of MgO/KNO3 composite was compared to other MgO composites promoted by alkali metal salts (K2CO3, KOH, NaNO3, Na2CO3, Na2HPO4 and LiNO3) at the same condition. The sorption rate of CO2 on MgO composite during initial 30 min was compared at different sorption temperature conditions, using a Fickian model. The cyclic working capacity and stability of MgO composite was evaluated by cyclic test.

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See more of this Session: CO2 Capture By Adsorption II: Adsorbents
See more of this Group/Topical: Separations Division