Investigation on One-step Synthesis of CaO/CuO Composite Pellets and their CO₂ Capture Performance

Calcium-copper composite absorber particles(CaO/CuO) were prepared by a one-step synthesis method, and the influence of preparation parameters on the molar ratio of calcium to copper within these particles was investigated. The results indicate that CaO/CuO composite absorbent particles with a molar ratio of one and uniform elemental distribution can be obtained by adjusting the molar ratio of Ca to Cu in the precursor solution and optimizing the adsorption duration. The calcining/reducing-oxidizing-carbonating cycle experiments were carried out on a fixed-bed reactor, and the oxidation performance of the composite pellets is highly stable, while the CO₂ capture performance is relatively consistent. The initial CO₂ adsorption capacity, measured as the mass of CO₂ adsorbed per gram of absorbent, is 0.18 g/g. After ten cycles, the composite pellets maintain 56% of their initial CO₂ capture efficiency, demonstrating sustained and reliable performance.