Effects of CaCl2 on cyclic carbonation-calcination kinetics of CaO-based composite for potential application to solar thermochemical energy storage

Choi, Dasol; Shin, Jiwoo; Park, Youngjune

doi:10.1016/j.ces.2020.116207

Cited by 27 publications

(9 citation statements)

References 43 publications

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“…However, CaCl 2 also makes the surface area decrease and sintering more serious, and adding MgO to the system at the same time can solve the sintering problem. 31 In previous studies, we have verified that adding alkali metal salts in the CaL process can effectively improve the stability of the absorbent. Meanwhile, the properties of molten sodium sulfate on the surface of calcium-based absorbents have been innovatively studied, including the rheological behavior of sodium sulfate on the heterogeneous surface 32 and the wettability of sodium sulfate on perfect and defective surfaces.…”

Section: ■ Introductionmentioning

confidence: 77%

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Influence of Vacancy Defects of the Calcium Oxide Surface on the Nonequilibrium Phase Transition of Alkali Metal Salts

et al. 2022

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Molten alkali metal salt effectively promotes the performance of calcium looping (CaL). Deep insight into the nonequilibrium phase-transition characteristic of alkali metal salt is better for the control of the temperature in CaL, which not only ensures the complete melting of metal salt but also prevents the reaction from inhibiting caused by higher temperatures. In this work, therefore, the molecular dynamics simulation method is used to explore the nonequilibrium phase-transition characteristic of Na 2 SO 4 . The results show that the equilibrium melting temperature of nanosodium sulfate on the calcium oxide surface is 810 K, which is lower than the macroscopic melting temperature. Meanwhile, the high heating rates led to the atoms in Na 2 SO 4 unable to break through the thermal stability limit, resulting in overheating of the crystal. Both the surface premelting and overheating melting temperature of the crystal are increased. When the heating rates are 0.25, 0.5, and 1.0 K/ps, the overheating melting temperatures are 845, 885, and 930 K, respectively. More than that, the surface defects enhance the interaction between CaO and Na 2 SO 4 because of the surface being charged. The increases in the interaction not only effectively break the stability of the crystal lattice of Na 2 SO 4 on the defective surfaces but also promote the energy transport inside Na 2 SO 4 . Therefore, as the defect concentration increases from 0 to 3% and 5%, the overheating melting temperature of Na 2 SO 4 gradually decreases from 845 to 836 and 815 K.

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Section: ■ Introductionmentioning

confidence: 77%

“…Choi et al analyzed the influence of CaCl 2 on the CaL process, and the results showed that CaCl 2 improves the diffusion behavior of CO 2 in the absorbent. However, CaCl 2 also makes the surface area decrease and sintering more serious, and adding MgO to the system at the same time can solve the sintering problem …”

Section: Introductionmentioning

confidence: 99%

Influence of Vacancy Defects of the Calcium Oxide Surface on the Nonequilibrium Phase Transition of Alkali Metal Salts

et al. 2022

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“…The absorption rate of each absorbent decreases gradually with increasing cycling time, and the lowest rate occurs in the second cycle. This results from the self-activation phenomenon associated with the Mg content of an absorbent . The self-activation of carbide slag absorbents occurred after the first cycle, and hence the CO 2 absorption rate was low in the second cycle and then increased after the third cycle.…”

Section: Resultsmentioning

confidence: 99%

“…The first step is a short and fast process, where a CO 2 injection reaction occurs directly on the surface of the absorbents. The second step is a mass transfer process involving CO 2 and/or ion diffusion through the crust of the absorbent . The pore size of the CMZ absorbent remained almost the same after 10 cycles and was conducive to the diffusion reaction of CO 2 but had some impact on the absorption rate.…”

Section: Resultsmentioning

confidence: 99%

“…This results from the self-activation phenomenon associated with the Mg content of an absorbent. 33 The self-activation of carbide slag absorbents occurred after the first cycle, and hence the CO 2 absorption rate was low in the second cycle and then increased after the third cycle. However, the CO 2 absorption decreased slightly with increasing cycle number.…”

Section: Resultsmentioning

confidence: 99%

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Highly Cyclic Stability and Absorbent Activity of Carbide Slag Doped with MgO and ZnO for Thermochemical Energy Storage

et al. 2022

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Carbide slag is a solid waste with a high content of reactive CaO, which can be used as an active material for the chemical absorption of CO2 and calcium looping. Calcium looping of CaO-based absorbents is one of the most promising methods of thermochemical energy storage. However, the sintering of pores and a reduction in the CO2 diffusion rates as the carbonization/calcination cyclic reaction progresses have posed challenges to the practical application of CaO-based absorbents. This study proposes a method for alleviating the sintering of the pore structure by improving the activity and cycling stability of such absorbents by doping carbide slag with MgO and ZnO powders. Results showed that the raw material ratio, reaction temperature, and reaction time have a considerable influence on the CO2 absorption rate. Furthermore, the specific surface area and pore volume of the absorbents increased with increasing ZnO and MgO doping levels in the carbide slag. Thus, the problems of sintering and clogging of pores in CaO-based absorbents were effectively alleviated, and the MgO and ZnO-doped absorbents CMZ85 and CMZ90 maintained 41–42% CO2 absorption after 10 cycles. These results confirmed that the cyclic stability and absorbent activity improved significantly with the MgO and ZnO doping of carbide slag for the calcium looping process.

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Li/Na/K carbonate solar salts for enhanced and integrated carbon capture and utilization via reverse water gas shift (ICCU-RWGS)

Zhao,

Hu,

Zong

et al. 2025

Applied Catalysis B: Environment and Energy

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Effects of CaCl2 on cyclic carbonation-calcination kinetics of CaO-based composite for potential application to solar thermochemical energy storage

Cited by 27 publications

References 43 publications

Influence of Vacancy Defects of the Calcium Oxide Surface on the Nonequilibrium Phase Transition of Alkali Metal Salts

Influence of Vacancy Defects of the Calcium Oxide Surface on the Nonequilibrium Phase Transition of Alkali Metal Salts

Highly Cyclic Stability and Absorbent Activity of Carbide Slag Doped with MgO and ZnO for Thermochemical Energy Storage

Li/Na/K carbonate solar salts for enhanced and integrated carbon capture and utilization via reverse water gas shift (ICCU-RWGS)

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