Journal
MOLECULES
Volume 27, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/molecules27175608
Keywords
CO2 capture; ZIF; high humidity; stable structure
Funding
- National Natural Science Foundation of China [22090062, 21922810, 21908155]
- Shanxi Scholarship Council of China [2021-053]
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This study demonstrates the promising potential of ZIF-94 for CO2/N-2 separation under high humidity conditions, indicating its potential applications in industrial settings.
The flue gas from fossil fuel power plants is a long-term stable and concentrated emission source of CO2, and it is imperative to reduce its emission. Adsorbents have played a pivotal role in reducing CO2 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 CO2 uptake (53.30 cm(3)/g), and the calculated CO2/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 CO2/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 CO2/N-2 separation under high humidity conditions in industrial settings.
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