(400o) Evaluation of CO2 Adsorption Performance of Ce-CaO Synthesized By Sol-Gel Method with Different Ce Ratios

Since the Industrial Revolution, increasing greenhouse gas emissions have intensified global efforts to mitigate climate change. Carbon Capture and Storage (CCS) technology has emerged as a prominent strategy for reducing carbon emissions. Among CCS processes, the capture step constitutes the majority of overall operational costs, underscoring the necessity for efficient carbon dioxide (CO₂) separation technologies. Adsorption is one such promising separation method, with optimal adsorption temperatures and adsorbents varying based on specific process requirements. For instance, calcium oxide (CaO)-based adsorbents selectively capture CO₂ at high temperatures ranging from approximately 500 to 700°C; however, repeated use leads to performance degradation due to sintering caused by particle agglomeration. To address this issue, cerium (Ce), a metal capable of inhibiting particle agglomeration was introduced into the CaO-based adsorbent. Incorporating Ce is expected to enhance cyclic adsorption performance significantly. Furthermore, the introduction of Ce can induce oxygen vacancies, potentially further improving CO₂ adsorption efficiency. Therefore, this study focused on optimizing CO₂ adsorption performance by varying the molar ratio of metal precursors (Ca/Ce).