Title: CO 2 Capture by Hybrid Ultramicroporous TIFSIX‐3‐Ni under Humid Conditions Using Non‐Equilibrium Cycling

Journal Article · · Angewandte Chemie
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [1]
  1. Department of Physics and Center for Functional Materials Wake Forest University Winston-Salem NC 27109 USA
  2. Department of Materials Science &, Engineering University of Texas at Dallas Richardson TX 75080 USA
  3. Bernal Institute Department of Chemical Sciences University of Limerick Limerick V94 T9PX Ireland
  4. Department of Chemistry and Chemical Biology Rutgers University Piscataway NJ 08854 USA
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Abstract Although pyrazine‐linked hybrid ultramicroporous materials (HUMs, pore size <7 Å) are benchmark physisorbents for trace carbon dioxide (CO 2 ) capture under dry conditions, their affinity for water (H 2 O) mitigates their carbon capture performance in humid conditions. Herein, we report on the co‐adsorption of H 2 O and CO 2 by TIFSIX‐3‐Ni—a high CO 2 affinity HUM—and find that slow H 2 O sorption kinetics can enable CO 2 uptake and release using shortened adsorption cycles with retention of ca. 90 % of dry CO 2 uptake. Insight into co‐adsorption is provided by in situ infrared spectroscopy and ab initio calculations. The binding sites and sorption mechanisms reveal that both CO 2 and H 2 O molecules occupy the same ultramicropore through favorable interactions between CO 2 and H 2 O at low water loading. An energetically favored water network displaces CO 2 molecules at higher loading. Our results offer bottom‐up design principles and insight into co‐adsorption of CO 2 and H 2 O that is likely to be relevant across the full spectrum of carbon capture sorbents to better understand and address the challenge posed by humidity to gas capture.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0019902
OSTI ID:
1875615
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 35 Vol. 134; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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