CO(2) Capture from High-Humidity Flue Gas Using a Stable Metal–Organic Framework

The flue gas from fossil fuel power plants is a long-term stable and concentrated emission source of CO(2), and it is imperative to reduce its emission. Adsorbents have played a pivotal role in reducing CO(2) emissions in recent years, but the presence of water vapor in flue gas poses a challenge to the stability of adsorbents. In this study, ZIF-94, one of the ZIF adsorbents, showed good CO(2) uptake (53.30 cm(3)/g), and the calculated CO(2)/N(2) (15:85, v/v) selectivity was 54.12 at 298 K. Because of its excellent structural and performance stability under humid conditions, the CO(2)/N(2) mixture was still well-separated on ZIF-94 with a separation time of 30.4 min when the relative humidity was as high as 99.2%, which was similar to the separation time of the dry gas experiments (33.2 min). These results pointed to the enormous potential applications of ZIF-94 for CO(2)/N(2) separation under high humidity conditions in industrial settings.