AI Article Synopsis

  • Calcium looping technology using CaO-based sorbents is important for CO capture from flue gas but suffers from instability and sintering issues.
  • The introduction of a high-entropy fluorite oxide (HEFO) improves the performance of these sorbents by enhancing their thermal resistance and anti-sintering properties.
  • The HEFO-modified sorbent pellets, created through a quick synthesis method, exhibit a CO capture capacity significantly higher than pure CaO, indicating strong potential for industrial use.

Article Abstract

The calcium looping technology employing CaO-based sorbents is pivotal for capturing CO from flue gas. However, the intrinsic low thermodynamic stability of CaO-based sorbents and the requisite molding step induce severe sintering issues, diminishing their cyclic stability. Herein, a high-entropy fluorite oxide (HEFO) inert stabilizer premised on entropy stabilization and synergistic effect strategies is introduced. HEFO-modified, CaO-based sorbent pellets are synthesized via a rapid cigarette butt-assisted combustion process (15 min) combined with the graphite molding method. Post-multiple cycles, their CO capture capacity reaches 0.373 g g, which is 2.6-fold superior to that of pure CaO, demonstrating markedly enhanced anti-sintering properties. First, the subtle morphological and crystallographic modifications suggest that the inherent entropy stability of HEFO imparts robust thermal resistance. Concurrently, the disordered structure of single-phase HEFO exhibits a high affinity for CaO, resulting in an interface binding energy of -1.83 eV, in sharp contrast to the -0.112 eV of pure CaO, thereby restricting CaO migration. Additionally, the multi-element synergistic effect of HEFO reduces the energy barrier by 0.15 eV, leading to a 40% and 140% increase in carbonation and calcination rates, respectively. This work presents highly efficient and rapidly synthesized CaO-based sorbent pellets, showcasing promising potential for industrial application.

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Source
http://dx.doi.org/10.1002/smll.202406165DOI Listing

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