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

Amine-functionalized metal-organic framework (MOF) material is a promising CO(2) captor in the post-combustion capture process owing to its large CO(2) working capacity as well as high CO(2) 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(2) from N(2). The results show that ED@MOF-520 adsorbent displays a superior CO(2) capture performance with a CO(2)/N(2) separation factor of 50 at 273 K, 185% times increase in the CO(2)/N(2) separation efficiency in comparison with blank MOF-520. Furthermore, ED@MOF-520 exhibits a moderate-strength interaction with 29 kJ mol(−1) adsorption heat for CO(2) uptake, which not only meets the requirement of CO(2) adsorption but also has good cycle stability. This work provides a promising adsorbent with a high CO(2)/N(2) separation factor to deal with carbon peak and carbon neutrality.