Nickel and iron impregnated alkali-modified fly ash nanoparticle for improved CO2 capture performance in MDEA aqueous solutions

doi:10.1016/j.cjche.2025.06.011

Chinese Journal of Chemical Engineering ›› 2025, Vol. 87 ›› Issue (11): 182-196.DOI: 10.1016/j.cjche.2025.06.011

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Nickel and iron impregnated alkali-modified fly ash nanoparticle for improved CO₂ capture performance in MDEA aqueous solutions

Bing Gao¹, Yiran Gao¹, Yue Zhao¹, Lemeng Wang¹, Liqiang Qi¹, Kun Zhao¹, Dong Fu¹, Jiaqi Wang², Pan Zhang¹

1. Department of Environmental Science and Technology, North China Electric Power University, Baoding 071003, China;
2. China Environmental United Certification Center Co., Ltd., Beijing 100029, China

Received:2025-03-05 Revised:2025-06-04 Accepted:2025-06-11 Online:2025-07-16 Published:2025-11-28
Contact: Pan Zhang,E-mail:zhangpan01@ncepu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (52106009 and 52206011), the Natural Science Foundation of Hebei Province (E2021502024), the Fundamental Research Funds for the Central Universities (2024MS170, 2023MS142, 2022MS109).

Nickel and iron impregnated alkali-modified fly ash nanoparticle for improved CO₂ capture performance in MDEA aqueous solutions

Bing Gao¹, Yiran Gao¹, Yue Zhao¹, Lemeng Wang¹, Liqiang Qi¹, Kun Zhao¹, Dong Fu¹, Jiaqi Wang², Pan Zhang¹

1. Department of Environmental Science and Technology, North China Electric Power University, Baoding 071003, China;
2. China Environmental United Certification Center Co., Ltd., Beijing 100029, China

通讯作者: Pan Zhang,E-mail:zhangpan01@ncepu.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (52106009 and 52206011), the Natural Science Foundation of Hebei Province (E2021502024), the Fundamental Research Funds for the Central Universities (2024MS170, 2023MS142, 2022MS109).

Abstract

Abstract: The use of amine-based absorbers, such as N-methyldiethanolamine (MDEA), for CO₂ capture presents a promising strategy for emission reduction as global warming intensifies. However, high energy consumption and limited absorption/desorption efficiencies constrain its application. To address these challenges, this study developed a composite catalyst derived from fly ash (FA), which is alkali-modified and incorporates nickel (Ni) and iron (Fe) elements, with the aim of enhancing CO₂ absorption and desorption performance while reducing energy consumption. Experimental results indicated that the Ni/FA-AM catalyst significantly improved adsorption and absorption efficiencies, achieving an 8% increase in capacity, a 63% increase in peak adsorption rate, and a reduction of 6000 s in saturation time. Studies conducted in a wetted-wall column revealed that the absorption process predominantly occurs in the liquid phase. Additionally, the catalyst demonstrated a 19% improvement in desorption performance, a 10% increase in peak desorption rate, and a 24% reduction in energy consumption, while maintaining stability over five consecutive cycles. The alkali-modified and Ni/Fe-enriched fly ash was confirmed to form active acid-base sites, facilitating the formation and disappearance of bicarbonate, thereby enhancing CO₂ capture efficiency. This was validated through XRD, BET, TPD, PY-IR, TEM, and FT-IR with ¹³C NMR characterization. This study highlights the potential of modified fly ash as a low-cost and efficient catalyst for CO₂ capture.

Key words: CO₂ absorption and desorption, Alkali-modified fly ash, MDEA, Nickel, Energy consumption

摘要： The use of amine-based absorbers, such as N-methyldiethanolamine (MDEA), for CO₂ capture presents a promising strategy for emission reduction as global warming intensifies. However, high energy consumption and limited absorption/desorption efficiencies constrain its application. To address these challenges, this study developed a composite catalyst derived from fly ash (FA), which is alkali-modified and incorporates nickel (Ni) and iron (Fe) elements, with the aim of enhancing CO₂ absorption and desorption performance while reducing energy consumption. Experimental results indicated that the Ni/FA-AM catalyst significantly improved adsorption and absorption efficiencies, achieving an 8% increase in capacity, a 63% increase in peak adsorption rate, and a reduction of 6000 s in saturation time. Studies conducted in a wetted-wall column revealed that the absorption process predominantly occurs in the liquid phase. Additionally, the catalyst demonstrated a 19% improvement in desorption performance, a 10% increase in peak desorption rate, and a 24% reduction in energy consumption, while maintaining stability over five consecutive cycles. The alkali-modified and Ni/Fe-enriched fly ash was confirmed to form active acid-base sites, facilitating the formation and disappearance of bicarbonate, thereby enhancing CO₂ capture efficiency. This was validated through XRD, BET, TPD, PY-IR, TEM, and FT-IR with ¹³C NMR characterization. This study highlights the potential of modified fly ash as a low-cost and efficient catalyst for CO₂ capture.

关键词: CO₂ absorption and desorption, Alkali-modified fly ash, MDEA, Nickel, Energy consumption

Bing Gao, Yiran Gao, Yue Zhao, Lemeng Wang, Liqiang Qi, Kun Zhao, Dong Fu, Jiaqi Wang, Pan Zhang. Nickel and iron impregnated alkali-modified fly ash nanoparticle for improved CO₂ capture performance in MDEA aqueous solutions[J]. Chinese Journal of Chemical Engineering, 2025, 87(11): 182-196.

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Nickel and iron impregnated alkali-modified fly ash nanoparticle for improved CO₂ capture performance in MDEA aqueous solutions

Nickel and iron impregnated alkali-modified fly ash nanoparticle for improved CO₂ capture performance in MDEA aqueous solutions

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