Solid with infused reactive liquid (SWIRL): A novel liquid-based separation approach for effective CO<sub>2</sub> capture.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35138903.
- Also identified by DOI 10.1126/sciadv.abm0144 and PMC identifier 8827647.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Economical CO<sub>2</sub> capture demands low-energy separation strategies. We use a liquid-infused surface (LIS) approach to immobilize reactive liquids, such as amines, on a textured and thermally conductive solid substrate with high surface-area to volume ratio (A/V) continuum geometry. The infused, micrometer-thick liquid retains that high A/V and directly contacts the gas phase, alleviating mass transport resistance typically encountered in mesoporous solid adsorbents. We name this LIS class "solid with infused reactive liquid" (SWIRL). SWIRL-amine requires no water dilution or costly mixing unlike the current liquid-based commercial approach. SWIRL-tetraethylenepentamine (TEPA) shows stable, high capture capacities at power plant CO<sub>2</sub> concentrations near flue gas temperatures, preventing energy-intensive temperature swings needed for other approaches. Water vapor increases CO<sub>2</sub> capacity of SWIRL-TEPA without compromising stability.