SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 36 ›› Issue (8): 157-169.DOI: 10.1016/j.cjche.2020.09.039

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Effect of different organic compounds on the preparation of CaO-based CO2 sorbents derived from wet mixing combustion synthesis

Tong Luo, Shaolong Liu, Cong Luo, Xiaolei Qi, Bowen Lu, Liqi Zhang   

  1. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2020-08-19 Revised:2020-09-15 Online:2021-09-30 Published:2021-08-28
  • Contact: Cong Luo
  • Supported by:
    This work was supported by National Natural Science Foundation of China (51606076), and Analytical and Testing Center of HUST for FSEM measurements.

Effect of different organic compounds on the preparation of CaO-based CO2 sorbents derived from wet mixing combustion synthesis

Tong Luo, Shaolong Liu, Cong Luo, Xiaolei Qi, Bowen Lu, Liqi Zhang   

  1. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • 通讯作者: Cong Luo
  • 基金资助:
    This work was supported by National Natural Science Foundation of China (51606076), and Analytical and Testing Center of HUST for FSEM measurements.

Abstract: CaO based sorbents have great potential for commercial use to capture CO2 of power plants. In the demand of producing sorbents with better cyclic performance, CaO-based sorbents derived from different kinds of calcium precursors, containing calcium carbonate (CC-CaO), calcium gluconate monohydrate (CG-CaO), calcium citrate (CCi-CaO) and calcium acetate monohydrate (CA-CaO), were tested cyclically and compared using simultaneous thermal analyzer (STA). And further study was conducted on the sorbents modified with citric acid monohydrate and 50% gluconic acid solution by wet mixing combustion synthesis. The modified sorbents showed better performance and higher pore parameters as well as porous microstructure with more organic acid added. After 20 cycles of carbonation and calcination, the C2CCi8 (CaO:citric acid=2:8 by mass ratio) and C2G8 (CaO:gluconic acid=2:8 by mass ratio) sorbent possess CO2 capture capacity of 0.45 g·g-1 (g CO2 per g sorbents) and 0.52 g·g-1 respectively. The citric acid was more effective for modification than gluconic acid for extended 50 cycles. Furthermore, good linear relationship between CaO conversion and specific surface area as well as pore volume were determined, of which the specific surface area showed closer correlation with CaO conversion.

Key words: CO2 capture, Calcium precursors, Wet mixing synthesis, Organic additives

摘要: CaO based sorbents have great potential for commercial use to capture CO2 of power plants. In the demand of producing sorbents with better cyclic performance, CaO-based sorbents derived from different kinds of calcium precursors, containing calcium carbonate (CC-CaO), calcium gluconate monohydrate (CG-CaO), calcium citrate (CCi-CaO) and calcium acetate monohydrate (CA-CaO), were tested cyclically and compared using simultaneous thermal analyzer (STA). And further study was conducted on the sorbents modified with citric acid monohydrate and 50% gluconic acid solution by wet mixing combustion synthesis. The modified sorbents showed better performance and higher pore parameters as well as porous microstructure with more organic acid added. After 20 cycles of carbonation and calcination, the C2CCi8 (CaO:citric acid=2:8 by mass ratio) and C2G8 (CaO:gluconic acid=2:8 by mass ratio) sorbent possess CO2 capture capacity of 0.45 g·g-1 (g CO2 per g sorbents) and 0.52 g·g-1 respectively. The citric acid was more effective for modification than gluconic acid for extended 50 cycles. Furthermore, good linear relationship between CaO conversion and specific surface area as well as pore volume were determined, of which the specific surface area showed closer correlation with CaO conversion.

关键词: CO2 capture, Calcium precursors, Wet mixing synthesis, Organic additives