Effect of Exposed Facets and Oxidation State of CeO(2) Nanoparticles on CO(2) Adsorption and Desorption.

CeO(2) nanoparticles exhibit potential as solid adsorbents for carbon dioxide (CO(2)) capture and storage (CCS), offering precise control over various facets and enhancing their efficiency. This study investigated the adsorption and desorption behaviors of two types of CeO(2) nanoparticles: cubic CeO(2) with primarily {001} facets and polyhedral CeO(2) with mainly {111} facets. The results showed that despite polyhedral CeO(2)'s lower quantity, it demonstrated successful adsorption-desorption cycles in both oxidized and reduced states. However, reduced CeO(2-x) exhibited a higher adsorption capacity but displayed irreversible adsorption-desorption cycles. Reversible adsorption occurred through weak bond formation with CO(2), while cubic CeO(2) with a high oxygen vacancy concentration exhibited irreversible adsorption due to strong bond formation. These insights contribute significantly to understanding CeO(2) nanoparticle characteristics and their impact on the CO(2) adsorption and desorption processes, aiding in the development of advanced CCS techniques.