NDLI: An ethylenediamine-grafted Y zeolite: a highly regenerable carbon dioxide adsorbent <i>via</i> temperature swing adsorption without urea formation

Content Provider	Royal Society of Chemistry (RSC)
Author	Choi, Minkee Cho, Sung June Chang, Shuai Kim, Chaehoon Cho, Hae Sung
Copyright Year	2016
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 H2O 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 H2O 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.
Starting Page	1803
Ending Page	1811
Page Count	9
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	9
Issue Number	5
Journal	Energy & Environmental Science
DOI	10.1039/c6ee00601a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	TSA Flue gas Urea Adsorption Water Zeolite Hydrophile Dehydration reaction
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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