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<p>This study aimed to develop various CaO/zeolite adsorbents tailored for mid-temperature CO₂ adsorption. It investigated the CO₂ uptake efficiency of these adsorbents during carbonation–decarbonation cycles, highlighting the effect of CaO loading on the adsorption efficiency of adsorbents produced by different synthesis methods. CO₂ temperature-programmed desorption (CO₂-TPD) confirmed the CO₂ uptake capacity of CaO/USY at medium temperatures (300&#xa0;°C). Among the CaO/zeolite adsorbents synthesized, the 10% CaO/USY exhibited the highest adsorption capacity at 300&#xa0;°C, with a CO₂ uptake of 34.94&#xa0;mmol·kg⁻<sup>1</sup> during the first cycle. The adsorbent also maintained its CO₂ capacity at 21&#xa0;mmol·kg⁻<sup>1</sup> over the next nine cycles. Physicochemical analysis revealed that the porous volume of the 10% CaO/USY adsorbent was 0.28 cm<sup>3</sup>·g⁻<sup>1</sup>, and its substantial surface area was 506.20 m<sup>2</sup>·g⁻<sup>1</sup>, as determined through N₂ adsorption measurements. Characterization using FTIR and FESEM confirmed the successful loading and uniform dispersion of CaO on USY, respectively. X-ray diffraction (XRD) analysis revealed that 10% CaO/USY exhibited a smaller CaO crystallite size (29&#xa0;nm) compared to bulk CaO (65&#xa0;nm) and 15% CaO/USY (32&#xa0;nm). Additionally, XRD identified the presence of calcium silicate salts (CaSiO₃ and Ca₂SiO₄) and calcium aluminate salts (Ca₁₂Al₁₄O₃₃), which reduce the CO₂ capture capacity but enhance cyclic stability. This finding suggests a potential approach to enhancing the effectiveness of adsorbents by optimizing the conversion of CaO into these salts. The results provide valuable insights for advancing and scaling up CaO/zeolite adsorbents for CO₂ capture.</p> Graphical abstract <p></p>

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Investigation on medium-temperature carbon dioxide capture performance over zeolite supported CaO adsorbents: synthesis and performance evaluation

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Xing Gang Zhang,
  • Archina Buthiyappan,
  • Abdul Aziz Abdul Raman,
  • Hendrik Simon Cornelis Metselaar,
  • Jegalakshimi Jewaratnam,
  • Yee Seng Tan

摘要

This study aimed to develop various CaO/zeolite adsorbents tailored for mid-temperature CO₂ adsorption. It investigated the CO₂ uptake efficiency of these adsorbents during carbonation–decarbonation cycles, highlighting the effect of CaO loading on the adsorption efficiency of adsorbents produced by different synthesis methods. CO₂ temperature-programmed desorption (CO₂-TPD) confirmed the CO₂ uptake capacity of CaO/USY at medium temperatures (300 °C). Among the CaO/zeolite adsorbents synthesized, the 10% CaO/USY exhibited the highest adsorption capacity at 300 °C, with a CO₂ uptake of 34.94 mmol·kg⁻1 during the first cycle. The adsorbent also maintained its CO₂ capacity at 21 mmol·kg⁻1 over the next nine cycles. Physicochemical analysis revealed that the porous volume of the 10% CaO/USY adsorbent was 0.28 cm3·g⁻1, and its substantial surface area was 506.20 m2·g⁻1, as determined through N₂ adsorption measurements. Characterization using FTIR and FESEM confirmed the successful loading and uniform dispersion of CaO on USY, respectively. X-ray diffraction (XRD) analysis revealed that 10% CaO/USY exhibited a smaller CaO crystallite size (29 nm) compared to bulk CaO (65 nm) and 15% CaO/USY (32 nm). Additionally, XRD identified the presence of calcium silicate salts (CaSiO₃ and Ca₂SiO₄) and calcium aluminate salts (Ca₁₂Al₁₄O₃₃), which reduce the CO₂ capture capacity but enhance cyclic stability. This finding suggests a potential approach to enhancing the effectiveness of adsorbents by optimizing the conversion of CaO into these salts. The results provide valuable insights for advancing and scaling up CaO/zeolite adsorbents for CO₂ capture.

Graphical abstract