Understanding the catalytic acceleration effect of steam on CaCO3 decomposition by density function theory

He, Dong; Ou, Zhiliang; Qin, Changlei; Deng, Tao; Yin, Junjun; Pu, Ge

doi:10.1016/j.cej.2019.122348

Cited by 138 publications

(52 citation statements)

References 42 publications

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“…During the coupled CO 2 capture and CaO/Ca(OH) 2 tests, the Ac‐CaO and CaO with low CO 2 capture activity were reactivated by the cyclic THS cycles. This phenomenon resulted from the hydration process during THS, which improves the pore structure and reduces the sintering of Ac‐CaO and CaO 37 . Therefore, CO 2 capture and CaO/Ca(OH) 2 THS using Ac‐CaO are promoted by each other, indicating that the novel coupled system shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Sun

Yan

et al. 2020

Greenhouse Gases

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CaO/Ca(OH) 2 thermochemical heat storage (THS) technology is considered to be one of the most promising technologies for large-scale solar energy storage. However, the THS performance of raw CaO-based materials decreases during multiple cycles. In this work, CaO derived from calcium acetate (Ac-CaO) is prepared and applied to a coupled system that achieved simultaneous CaO/Ca(OH) 2 THS and CO 2 capture. The CO 2 capture and THS performances of Ac-CaO are always higher than those of calcined limestone owing to the preferable pore structure, whereas Ac-CaO exhibits decreasing CO 2 capture and THS performance resulting from sintering and the formation of CaCO 3 from CaO or Ca(OH) 2 with ambient CO 2 during air cooling, respectively. In the coupled CaO/Ca(OH) 2 THS and CO 2 capture system, Ac-CaO is subjected to 10 CO 2 capture cycles, 30 THS cycles, 1 CO 2 capture cycle, 10 THS cycles, 1 CO 2 capture cycle, and 10 THS cycles sequentially. The hydration and dehydration conversions of Ac-CaO in the 31st THS cycle reach 91.7 and 93.6%, respectively, which are 1.6 and 1.6 times higher than those recorded prior to the 11th CO 2 capture cycle owing to the decomposition of CaCO 3 during calcination. The carbonation conversion of Ac-CaO achieves 89.9% in the 11th CO 2 capture cycle, which is 22.3% higher than that recorded prior to the 10 THS cycles owing to reactivation from the hydration process during THS. The CO 2 capture and CaO/Ca(OH) 2 THS processes are enhanced in the coupled system using Ac-CaO; therefore, the coupled system appears promising for CaO/Ca(OH) 2 THS and CO 2 capture.

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Section: Resultsmentioning

confidence: 99%

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Sun

Yan

et al. 2020

Greenhouse Gases

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“…Global warming caused by CO 2 emissions has drawn the attention of the scientific community. 1 , 2 Appropriate efforts have been made to eliminate CO 2 from flue gases emitted by power plants, particularly those based on fossil fuel combustion, as they are the primary sources of CO 2 emissions. 3 − 5 The calcium looping (CaL), which applies cyclic carbonation and calcination reactions of a calcium-based sorbent, is one of the potential methods for CO 2 capture technology.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Bromide on CaO-Based Sorbents Derived from Three Kinds of Sources for CO₂ Capture

Cheng

Luo

et al. 2020

ACS Omega

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The calcium looping (CaL), which applies carbonation/calcination cyclic reactions of a CaO sorbent, has received extensive attention for postcombustion CO 2 capture. However, as the number of cyclic reactions increased, the capture efficiency of regenerated CaO decreased rapidly. Sodium doping was proposed for modification of a CaO sorbent, but there was little research on whether sodium doping had a good effect on different kinds of sorbents. In this paper, three different kinds of calcium-based sorbents, i.e., CaCO 3 , dolomite, and SG-CaO, were modified by NaBr to explore the effect of sodium on CO 2 capture performance. The results showed that the modification effects of sodium on three kinds of precursors were different. For CaCO 3 , the modification effect of sodium doping was the best. After 50 cycles, the sorption capacity of CaO/NaBr was over 3.5 times that of an unmodified sorbent; for dolomite, sodium had a moderate effect during initial cycles and then showed obvious improvement in the stability of the sorbent, the sorption capacity of the modified dolomite increased by over 30% after 50 cycles; for the SG-CaO, sodium had a negative effect, the sorption capacity of the modified sorbent decreased by about 30% after 50 cycles. When the atmosphere contained SO 2 , the doping of an alkali metal also showed a certain effect.

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“…CO 2 emissions from the utilization of fossil fuels are the most driving force of global warming [1][2][3][4]. Therefore, it is urgent to develop potential approaches to reduce CO 2 emissions [5].…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Energy Storage Performances of Steel Slag‐Derived CaO‐Based Composites

et al. 2020

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Low-cost and easily scaled-up acidification is a potential synthesis approach to produce CaO-based composites derived from steel slag for thermal energy storage/release via multicyclic calcination/carbonation. Acid concentration, acidification temperature, and acidification duration were comparatively investigated. The cyclic thermal energy storage/release properties of such composites are closely related to the acidification parameters, mainly attributed to the differences in the composition of the synthetic composites under different acidification conditions. The synergistic effect of the increased Ca and Mg content as well as the reduced content of Si and Fe within the composites contributes to improve their cyclic thermal energy storage/release performance.

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Understanding the catalytic acceleration effect of steam on CaCO3 decomposition by density function theory

Cited by 138 publications

References 42 publications

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Effect of Sodium Bromide on CaO-Based Sorbents Derived from Three Kinds of Sources for CO₂ Capture

Thermochemical Energy Storage Performances of Steel Slag‐Derived CaO‐Based Composites

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Understanding the catalytic acceleration effect of steam on CaCO3 decomposition by density function theory

Cited by 138 publications

References 42 publications

Coupled CO2 capture and thermochemical heat storage of CaO derived from calcium acetate

Coupled CO2 capture and thermochemical heat storage of CaO derived from calcium acetate

Effect of Sodium Bromide on CaO-Based Sorbents Derived from Three Kinds of Sources for CO2 Capture

Thermochemical Energy Storage Performances of Steel Slag‐Derived CaO‐Based Composites

Contact Info

Product

Resources

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Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Coupled CO₂ capture and thermochemical heat storage of CaO derived from calcium acetate

Effect of Sodium Bromide on CaO-Based Sorbents Derived from Three Kinds of Sources for CO₂ Capture