A scalable metal-organic framework as a durable physisorbent for carbon dioxide capture

• Published in: Science (American Association for the Advancement of Science) Vol. 374; no. 6574; pp. 1464 - 1469
• Main Authors: Lin, Jian-Bin, Nguyen, Tai T. T., Vaidhyanathan, Ramanathan, Burner, Jake, Taylor, Jared M., Durekova, Hana, Akhtar, Farid, Mah, Roger K., Ghaffari-Nik, Omid, Marx, Stefan, Fylstra, Nicholas, Iremonger, Simon S., Dawson, Karl W., Sarkar, Partha, Hovington, Pierre, Rajendran, Arvind, Woo, Tom K., Shimizu, George K. H.
• Format: Journal Article
• Language: English
• Published: United States The American Association for the Advancement of Science 17.12.2021; AAAS
• Subjects: Amines; Binding sites; Carbon dioxide; Carbon sequestration; Chemisorption; Composite materials; Computer applications; Durability; Engineering Materials; Flue gas; Fossil fuels; Fuel combustion; Humidity; Hydrogen bonding; Hydrophobicity; Materialteknik; Metal-organic frameworks; Regeneration; Relative humidity; Science & Technology - Other Topics; Sorbents; Water; Water chemistry; Zinc
• ISSN: 0036-8075; 1095-9203; 1095-9203
• DOI: 10.1126/science.abi7281

Most materials for carbon dioxide (CO 2 ) capture of fossil fuel combustion, such as amines, rely on strong chemisorption interactions that are highly selective but can incur a large energy penalty to release CO 2 . Lin et al . show that a zinc-based metal organic framework material can physisorb CO 2 and incurs a lower regeneration penalty. Its binding site at the center of the pores precludes the formation of hydrogen-bonding networks between water molecules. This durable material can preferentially adsorb CO2 at 40% relative humidity and maintains its performance under flue gas conditions of 150°C. —PDS A metal-organic framework captures CO 2 with high capacity and selectivity over steam with only a modest regeneration penalty. Metal-organic frameworks (MOFs) as solid sorbents for carbon dioxide (CO 2 ) capture face the challenge of merging efficient capture with economical regeneration in a durable, scalable material. Zinc-based Calgary Framework 20 (CALF-20) physisorbs CO 2 with high capacity but is also selective over water. Competitive separations on structured CALF-20 show not just preferential CO 2 physisorption below 40% relative humidity but also suppression of water sorption by CO 2 , which was corroborated by computational modeling. CALF-20 has a low enthalpic regeneration penalty and shows durability to steam (>450,000 cycles) and wet acid gases. It can be prepared in one step, formed as composite materials, and its synthesis can be scaled to multikilogram batches.