Adsorption of Carbon Dioxide by MIL-101(Cr): Regeneration Conditions and Influence of Flue Gas Contaminants

Abstract

MIL-101(Cr) has drawn much attention due to its high stability compared with other metal-organic frameworks. In this study, three trace flue gas contaminants (H₂O, NO, SO₂) were each added to a 10 vol% CO₂/N₂ feed flow and found to have a minimal impact on the adsorption capacity of CO₂. In dynamic CO₂ regeneration experiments, complete regeneration occurred in 10 min at 328 K for temperature swing adsorption-N₂-stripping under a 50 cm³/min N₂ flow and at 348 K for vacuum-temperature swing adsorption at 20 KPa. Almost 99% of the pre-regeneration adsorption capacity was preserved after 5 cycles of adsorption/desorption under a gas flow of 10 vol% CO₂, 100 ppm SO₂, 100 ppm NO, and 10% RH, respectively. Strong resistance to flue gas contaminants, mild recovery conditions, and excellent recycling efficiency make MIL-101(Cr) an attractive adsorbent support for CO₂ capture.