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

doi:10.1016/j.cjche.2020.09.039

Abstract

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

Tong Luo, Shaolong Liu, Cong Luo, Xiaolei Qi, Bowen Lu, Liqi Zhang. Effect of different organic compounds on the preparation of CaO-based CO₂ sorbents derived from wet mixing combustion synthesis[J]. Chinese Journal of Chemical Engineering, 2021, 36(8): 157-169.

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

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

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