AI Article Synopsis
- Typical aerogels have high surface areas suitable for CO adsorption but lack specific porosity and selectivity, which limits their effectiveness.
- A new type of aerogel, called hierarchical metal-organic aerogel (HMOA), is developed with defined micropores through the integration of chromium(III) and organic ligands.
- HMOA demonstrates excellent features for CO adsorption, including high capacity, selectivity, and the ability to regenerate completely after 20 cycles, while being easy to produce through simple drying methods.
Article Abstract
Typical amorphous aerogels pose great potential for CO adsorbents with high surface areas and facile diffusion, but they lack well-defined porosity and specific selectivity, inhibiting utilization of their full functionality. To assign well-defined porous structures to aerogels, a hierarchical metal-organic aerogel (HMOA) is designed, which consists of well-defined micropores ( ∼ 1 nm) by coordinative integration with chromium(III) and organic ligands. Due to its hierarchical structure with intrinsically flexible coordination, the HMOA has excellent porous features of a high surface area and a reusable surface with appropriate binding energy for CO adsorption. The HMOA features high CO adsorption capacity, high CO/N IAST selectivity, and vacuum-induced surface regenerability (100% through 20 cycles). Further, the HMOA could be prepared via simple ambient drying methods while retaining the microporous network. This unique surface-tension-resistant micropore formation and flexible coordination systems of HMOA make it a potential candidate for a CO adsorbent with industrial scalability and reproducibility.
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| http://dx.doi.org/10.1021/acsami.2c14453 | DOI Listing |
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