421498 Hierarchical LTA Zeolites with Amine-Functionalized Mesoporous Domain for Post-Combustion Carbon Dioxide Capture

Thursday, November 12, 2015: 4:15 PM
255D (Salt Palace Convention Center)
Tae-Hyun Bae, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore

Owing to global concern on climate change caused by rising atmospheric CO2 concentration, the technologies for capturing CO2 from anthropogenic sources, such as coal-fired power plants, have attracted a great amount of interests. Among various methods available, capturing CO2 with solid adsorbents has been considered as an energy-efficient alternative to conventional amine scrubbing that consumes a large amount of energy for the regeneration of media. Efforts to develop solid adsorbents performing at conditions relevant to the flue gas released from coal-fired power plants lead to synthesis of various alkylamine-functionalized mesoporous materials including MCM-41 and SBA-15. Even though amine groups in such materials can effectively capture CO2 molecules, the substrates typically have thick pores walls that cannot contribute to CO2 uptake while increasing the mass of sorbent. Thus, optimizing the substrate structure can significantly improve the CO2 uptake property of resultant materials.

  In this work, we synthesized hierarchical LTA zeolites containing amine-functionalized mesoporous domain. Gas adsorption study revealed that CO2 molecules are effectively captured by both alkylamine groups in the mesopore domain and active sites in the LTA zeolite. Hence, the amount of CO2 uptake on this material was much greater than that for conventional aminosilicas at the conditions relevant to post-combustion CO2 capture.

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