Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China.
Molecules. 2022 Aug 31;27(17):5608. doi: 10.3390/molecules27175608.
The flue gas from fossil fuel power plants is a long-term stable and concentrated emission source of CO, and it is imperative to reduce its emission. Adsorbents have played a pivotal role in reducing CO 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 uptake (53.30 cm/g), and the calculated CO/N (15:85, /) selectivity was 54.12 at 298 K. Because of its excellent structural and performance stability under humid conditions, the CO/N 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/N separation under high humidity conditions in industrial settings.
燃煤电厂的烟气是 CO 的长期稳定且集中的排放源，减少其排放量迫在眉睫。吸附剂在近年来减少 CO 排放方面发挥了关键作用，但烟道气中水蒸气的存在对吸附剂的稳定性提出了挑战。在这项研究中，沸石咪唑酯骨架结构 94（ZIF-94）作为 ZIF 吸附剂之一，表现出良好的 CO 吸收能力（53.30 cm/g），在 298 K 下计算出的 CO/N（15:85，/）选择性为 54.12。由于其在潮湿条件下具有出色的结构和性能稳定性，即使在相对湿度高达 99.2%的情况下，CO/N 混合物仍能在 ZIF-94 上很好地分离，分离时间为 30.4 分钟，与干燥气体实验的分离时间（33.2 分钟）相似。这些结果表明，ZIF-94 在工业环境中高湿度条件下用于 CO/N 分离具有巨大的应用潜力。
