CeO₂ nanoparticles exhibit potential as solid adsorbents for carbon dioxide (CO₂) 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 CeO₂ nanoparticles: cubic CeO₂ with primarily {001} facets and polyhedral CeO₂ with mainly {111} facets. The results showed that despite polyhedral CeO₂’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 CO₂, while cubic CeO₂ with a high oxygen vacancy concentration exhibited irreversible adsorption due to strong bond formation. These insights contribute significantly to understanding CeO₂ nanoparticle characteristics and their impact on the CO₂ adsorption and desorption processes, aiding in the development of advanced CCS techniques.

中文翻译：

---

CeO2 纳米粒子的暴露面和氧化态对 CO2 吸附和解吸的影响

CeO ₂纳米颗粒具有作为二氧化碳 (CO ₂ ) 捕获和储存 (CCS) 固体吸附剂的潜力，可提供对各个方面的精确控制并提高其效率。本研究研究了两种类型的CeO ₂纳米颗粒的吸附和解吸行为：主要具有{001}面的立方CeO ₂和主要具有{111}面的多面体CeO ₂ 。结果表明，尽管多面体 CeO ₂的含量较低，但它在氧化态和还原态下都表现出成功的吸附-解吸循环。然而，还原的CeO _{2– x}表现出更高的吸附容量，但表现出不可逆的吸附-解吸循环。通过与CO ₂形成弱键而发生可逆吸附，而具有高氧空位浓度的立方CeO ₂由于形成强键而表现出不可逆吸附。这些见解有助于了解 CeO ₂纳米颗粒的特性及其对 CO ₂吸附和解吸过程的影响，有助于先进 CCS 技术的开发。