High-Selective CO 2 Capture in Amine-Decorated Al-MOFs

Amine-functionalized metal-organic framework (MOF) material is a promising CO captor in the post-combustion capture process owing to its large CO working capacity as well as high CO selectivity and easy regeneration. In this study, an ethylenediamine (ED)-decorated Al-based MOFs (named ED@MOF-520) with a high specific area and permanent porosity are prepared and evaluated to study the adsorption and separation of CO from N . The results show that ED@MOF-520 adsorbent displays a superior CO capture performance with a CO /N separation factor of 50 at 273 K, 185% times increase in the CO /N separation efficiency in comparison with blank MOF-520. Furthermore, ED@MOF-520 exhibits a moderate-strength interaction with 29 kJ mol adsorption heat for CO uptake, which not only meets the requirement of CO adsorption but also has good cycle stability. This work provides a promising adsorbent with a high CO /N separation factor to deal with carbon peak and carbon neutrality.