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CaOCaO-based carbonCarbon capture is a promising strategy for mitigating global warming due to its high capacity and low cost. However, performance degradation occurs due to particle sintering. To address this, Al2O3 can be used as a structural support to promote the formation of calcium aluminates, thereby enhancing structural stability. In this study, the particle size of Al2O3 was optimized to improve the performance of calcium-based sorbents. It was found that the particle size of Al2O3 significantly influences CO₂ capture performance. Among the tested samples, CaOCaO@Al2O3-20 exhibited the best performance, achieving a capture capacity of 0.44 g-CO2/g-sorbent and a conversion rate of 69.8% after 20 cycles. The increased formation of calcium aluminates, as evidenced by XRD, XPS, and solid-state 27Al MAS-NMR analyses, was identified as the main factor contributing to the improved cyclic stability and sintering resistance. This finding aligns with our previous studies, which also emphasized the significant influence of Al2O3 sources and phases on the CO2 captureCO capture performance of sorbents.

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Optimizing Al2O3 Particle Size to Enhance CO2 Capture Performance of CaO-Based Sorbents

  • 会议论文

  • 发表日期：

    2026年

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  • Xingyue Ma,
  • Jianqi Cao,
  • Wanlin Wang,
  • Yongqi Sun

摘要

CaOCaO-based carbonCarbon capture is a promising strategy for mitigating global warming due to its high capacity and low cost. However, performance degradation occurs due to particle sintering. To address this, Al2O3 can be used as a structural support to promote the formation of calcium aluminates, thereby enhancing structural stability. In this study, the particle size of Al2O3 was optimized to improve the performance of calcium-based sorbents. It was found that the particle size of Al2O3 significantly influences CO₂ capture performance. Among the tested samples, CaOCaO@Al2O3-20 exhibited the best performance, achieving a capture capacity of 0.44 g-CO2/g-sorbent and a conversion rate of 69.8% after 20 cycles. The increased formation of calcium aluminates, as evidenced by XRD, XPS, and solid-state 27Al MAS-NMR analyses, was identified as the main factor contributing to the improved cyclic stability and sintering resistance. This finding aligns with our previous studies, which also emphasized the significant influence of Al2O3 sources and phases on the CO2 captureCO capture performance of sorbents.