Development of stabilized Ca-based CO2 sorbents supported by fly ash

Chen, Huichao; Khalili, Nasser; Li, Jiajie

doi:10.1016/j.cej.2018.03.162

Cited by 34 publications

(10 citation statements)

References 51 publications

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“…Although higher contents of CaO are commonly associated with higher free lime contents, other Ca-bearing minerals commonly present in fly ashes also contribute to the bulk CaO concentration, but their reactivity with CO 2 is much lower than that of free lime, leading to lower CO 2 sequestration capacities and efficiencies. The values calculated in this work are higher than those previously reported [48][49][50].…”

Section: Carbonation Efficiency and Co 2 Sequestration Capacitycontrasting

confidence: 85%

Utilization of high-calcium fly ashes through mineral carbonation: The cases for Greece, Poland and Spain

Cwik

Casanova

Rausis

et al. 2019

Journal of CO2 Utilization

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Limited utilization possibilities of high-calcium fly ashes (HCFA) are a serious issue not only in Europe, but also worldwide. The properties of such waste from coal-fired power plants could be conveniently treated in order to make their compositions compliant with national regulations and allow their use in a variety of industrial applications. This work reports on an investigation of mineral carbonation of HCFA from Greece, Poland and Spain with total CaO contents between 10 and 15 wt.%. Two types of experiments, batch and continuous flow, with and without the addition of water vapor, were performed. Best carbonation efficiency obtained was 47 % of the bulk CaO content. The free lime content of the samples was found to be the controlling factor. After treatment, the amount of free lime was reduced 2 to values suitable for their utilization as supplementary cementitious materials. The addition of water to the system played also an important role in the progress of the carbonation reactions. Our results strongly suggest that a carbonation treatment of HCFA could contribute to the circular economy of such waste materials and potentially increase their utilization in the construction industry, as well as make a significant contribution to lowering of the CO 2 emissions in coal-burning industrial facilities.

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Section: Carbonation Efficiency and Co 2 Sequestration Capacitycontrasting

confidence: 85%

Utilization of high-calcium fly ashes through mineral carbonation: The cases for Greece, Poland and Spain

Cwik

Casanova

Rausis

et al. 2019

Journal of CO2 Utilization

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“…It can be used as a catalyst [1][2][3], pellet for CO 2 capture and kinetic analysis [4,5], toxic-waste remediation agent, or as an additive in refractory and paint industries [6], antimicrobial agent, a drug delivery agent, as well as in various other biomedical applications [7]. Calcium oxide has been regarded as one of the most promising candidates for carbon capture [8][9][10][11][12][13] due to its good kinetics and high capture capacity, low running cost [14], and even under low CO 2 partial pressures. It is demonstrated even by the fact the CaO is unstable in air and will gradually convert back to CaCO 3 when cooled back to room temperature [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of calcium oxide nanoparticles for CO2 capture

et al. 2022

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In this paper, the preparation of calcium oxide (CaO) nanoparticles (NPs) is reported by a precipitation method, using CaCl2 and NaOH as starting raw materials. The produced NPs were characterized for chemical composition, phase composition, particle size distribution, morphological features, specific surface area, and crystallite sizes. It is shown that calcination of Ca(OH)2 in vacuum takes place faster/at a lower temperature compared to the calcination in air due to the higher entropy of the gaseous product of calcination. It is also shown that when these CaO nanoparticles are kept at room temperature in air, they fully and spontaneously transform into CaCO3 within 3 weeks. Therefore, if this material is disposed in open fields (not necessarily in industrial conditions), it is able to capture carbon dioxide from normal air slowly, but surely. However, when the CaO nanoparticles are kept in the air at 100–200 °C, they mostly capture water vapor from the air instead of carbon dioxide, and the resulting calcium hydroxide blocks the carbon dioxide capture by CaO nanoparticles.

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“…A mass of fresh sorbent is still required due to the drop of carbonation conversion of the sorbents, which will add to the cost of the CaL system. Hence, recycling the waste sources has been proposed, − and a host of technologies has also been developed for enhancing the carbonation conversion of the CaO-based sorbents, including acid pretreatment, steam hydration, doping, or supporting , with other inert oxides, multishelled CaO nanoparticles, templated with pore forming materials, − screening of effective organic calcium precursor, , development of advanced preparation methods, ,, optimizing of reaction conditions, − and so on. Among these techniques, doping has been considered as a cost-effective method to improve the carbonation performance.…”

Section: Introductionmentioning

confidence: 99%

Potential Synergy of Chlorine and Potassium and Sodium Elements in Carbonation Enhancement of CaO-Based Sorbents

Xu¹,

Ding²,

Luo³

et al. 2018

ACS Sustainable Chem. Eng.

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The calcium looping process is well regarded as one of the most prospective technologies for trapping CO2 from flue gas. However, the carbonation conversion of CaO derived from natural Ca precursors decayed drastically during the long-term cycles. Doping has been considered as a promising method to improve the cyclic carbonation performance. However, alkali salt, which derives from abundant natural sustainable resources such as seawater, saline, bittern deposit, and so on, is regarded as a low melting material that can hardly enhance the cyclic carbonation performance of the CaO-based sorbents. In this study, two common alkali salts, sodium and potassium, were doped to investigate the potential enhancing effect of alkali salt on CaO-based sorbents. The cyclic carbonation performance of those sorbents was tested in a simultaneous thermal analyzer (STA), and the enhancing mechanisms were illustrated by scanning electron microscope (SEM), X-ray powder diffraction (XRD), and N2 physical absorption methods. The results illustrated that KCl, NaCl, and K2CO3 boosted the carbonation property of CaO markedly, while KOH, NaOH, and Na2CO3 were detrimental to the sorbents. The synergistic effect of K+, Na+, and Cl– can improve the cyclic carbonation performance of CaO. After 50 cycles, the carbonation conversions of CaO modified by KCl or NaCl were about twice that of unmodified CaO. In general, the KCl and NaCl are promising dopants that can markedly enhance the carbonation property of CaO-based sorbents.

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Development of stabilized Ca-based CO2 sorbents supported by fly ash

Cited by 34 publications

References 51 publications

Utilization of high-calcium fly ashes through mineral carbonation: The cases for Greece, Poland and Spain

Utilization of high-calcium fly ashes through mineral carbonation: The cases for Greece, Poland and Spain

Synthesis and characterization of calcium oxide nanoparticles for CO2 capture

Potential Synergy of Chlorine and Potassium and Sodium Elements in Carbonation Enhancement of CaO-Based Sorbents

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