An ethylenediamine-grafted Y zeolite: a highly regenerable carbon dioxide adsorbent via temperature swing adsorption without urea formation. Issue 5 (4th April 2016)

• Record Type: Journal Article
• Authors: Kim, Chaehoon; Cho, Hae Sung; Chang, Shuai; Cho, Sung June; Choi, Minkee
• Is Part Of: Energy & environmental science. Volume 9:Issue 5(2016)
• Page Start: 1803
• Page End: 1811
• Publication Date: 2016-04-04
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/c6ee00601a
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : An ethylenediamine-grafted Y zeolite effectively adsorbs CO2 from a wet flue gas and it is highly regenerable through a temperature swing adsorption (TSA) process. Abstract : Solid adsorbents including amine-functionalized porous materials and zeolites have been extensively investigated for post-combustion CO2 capture. Amine-functionalized porous materials have shown highly promising CO2 uptake in a wet flue gas, but suffer from significant amine deactivation due to urea formation under desorption conditions ( e.g., desorption under 100% CO2 at >130 °C) of temperature swing adsorption (TSA) cycles. In contrast, purely inorganic zeolites are thermochemically stable but cannot adsorb CO2 from a wet flue gas because of the preferential H2 O adsorption. In the present work, we synthesized an ethylenediamine-grafted Y zeolite, which can synergistically combine the strengths of both adsorbent systems. The amine groups can effectively capture CO2 in a wet flue gas, while the strongly co-adsorbed H2 O within the hydrophilic zeolite micropores suppresses urea formation (dehydration reaction between amines and CO2 ) under desorption conditions according to Le Chatelier's principle. The organic–zeolite hybrid adsorbent retains working capacities higher than 1.1 mmol g −1 over 20 TSA cycles. Because the adsorbent is prepared from a commercially available zeolite, it is also highly cost efficient and suitable for mass production.