With increasing global attention on environmental protection, reducing CO₂ emissions from shipping is urgent. This study explores post-combustion CO₂ capture using adsorbents for marine exhaust. A SrO-based CO₂ adsorbent supported by CeO₂ was prepared via sol-gel method, and its cyclic adsorption capacity was tested through fixed-bed experiments. The impact of dopants, carbonation temperature, and CO₂ concentration on adsorption performance was studied, and the microstructure was analyzed using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), and Brunauer-Emmett-Teller (BET). Results show that Ce-2SrO demonstrates excellent performance and stability at 880 ℃ and 950 ℃ under adsorption-desorption conditions, retaining about 93% CO₂ adsorption efficiency after 20 cycles. SEM and EDS reveal that CeO₂ is evenly distributed within SrO pores, enhancing pore structure stability, adsorption capacity, and resistance to sintering. SrO-based adsorbents show excellent thermal sintering resistance due to CeO₂. Additionally, CeO₂ promotes ion migration during carbonation, helping maintain adsorption activity. This study presents a novel approach for synthesizing efficient, stable CO₂ adsorbents and offers a new strategy for marine carbon capture.

Keywords: CO₂ capture, Adsorbent, Ce-2SrO, High efficiency, Cyclic stability.