Protonated amines mediated CO2 mineralization of coal fly ash and polymorph selection of CaCO3

Huang, Yunxie; Zheng, Xuan; Wei, Yibin; He, Qingyao; Yan, Shuiping; Ji, Long

doi:10.1016/j.cej.2022.138121

Cited by 33 publications

(4 citation statements)

References 42 publications

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“…The electrolysis contributed to the enhanced dissolution of fly ash, and then it increased the Cn from 9.75 to 18.42 g CO2/kg fly ash in the NaCl electrolyte. In addition, protonated amine [54] and glycine [55,56] were used as reagents during the COFA-based leaching-mineralization course, which avoided the large consumption of exogenous acid-base reagents. The protonated amine could promote Ca 2+ leaching from COFA, and simultaneously be converted into free amine [54].…”

Section: Nanomentioning

confidence: 99%

“…The authors systematically investigated the CO2 mineralization performance of 13 typical amine-mediated COFA and the polymorph selection of CaCO3. Triethanolamine (TEA) exhibited the largest CaCO3 yield of 56.8%, and In addition, protonated amine [54] and glycine [55,56] were used as reagents during the COFA-based leaching-mineralization course, which avoided the large consumption of exogenous acid-base reagents. The protonated amine could promote Ca 2+ leaching from COFA, and simultaneously be converted into free amine [54].…”

Section: Nanomentioning

confidence: 99%

“…Triethanolamine (TEA) exhibited the largest CaCO3 yield of 56.8%, and In addition, protonated amine [54] and glycine [55,56] were used as reagents during the COFA-based leaching-mineralization course, which avoided the large consumption of exogenous acid-base reagents. The protonated amine could promote Ca 2+ leaching from COFA, and simultaneously be converted into free amine [54]. Then, the free amine adsorbed the protons released by the precipitation reaction of CaCO 3 and could achieve in-situ regeneration of protonated amine.…”

Section: Nanomentioning

confidence: 99%

See 2 more Smart Citations

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

Jiang,

Cheng,

Zhang

et al. 2023

Energies

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Coal fly ashes (COFA) are readily available and reactive materials suitable for CO2 sequestration due to their substantial alkali components. Therefore, the onsite collaborative technology of COFA disposal and CO2 sequestration in coal-fired power plants appears to have potential. This work provides an overview of the state-of-the-art research studies in the literature on CO2 sequestration via the mineralization of COFA. The various CO2 sequestration routes of COFA are summarized, mainly including direct and indirect wet carbonation, the synthesis of porous CO2 adsorbents derived from COFA, and the development of COFA-derived inert supports for gas-solid adsorbents. The direct and indirect wet carbonation of COFA is the most concerned research technology route, which can obtain valued Ca-based by-products while achieving CO2 sequestration. Moreover, the Al and Si components rich in fly ash can be adapted to produce zeolite, hierarchical porous nano-silica, and nano-silicon/aluminum aerogels for producing highly efficient CO2 adsorbents. The prospects of CO2 sequestration technologies using COFA are also discussed. The objective of this work is to help researchers from academia and industry keep abreast of the latest progress in the study of CO2 sequestration by COFA.

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Section: Nanomentioning

confidence: 99%

Section: Nanomentioning

confidence: 99%

Section: Nanomentioning

confidence: 99%

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A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

Jiang,

Cheng,

Zhang

et al. 2023

Energies

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“…The dominant crystalline phase with CaO as the precursor is calcite, whereas the crystalline phases with CaSiO 3 as the precursor are aragonite, calcite, and vaterite. The kinetics of mineralization-desorption have also been figured out by several studies. , The CO 2 -mineralized calcium minerals have potential for utilization as a supplementary cementitious material. Due to the significant effect of potassium glycine (KG) solution on the mineralization efficiency and dominant CaCO 3 crystalline phase, the activity of KG-carbonated calcium minerals in cementitious materials may be different from that of gaseous exposure carbonation, which has not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Activation of Wollastonite Cementitious Material Based on the Mineralization-Desorption of Potassium Glycine Absorbent

Chen,

Han,

Guo

et al. 2024

ACS Sustainable Chem. Eng.

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This study presents a new CCUS method, which uses potassium glycine (KG) solution to capture CO2 derived from industrial flue gases and sequesters the CO2 in wollastonite by mineralization-desorption, thus achieving the cyclic regeneration of the KG absorbent and the activation of wollastonite. The results confirm the favorable absorption capacity and desorption efficiency of this method, with the CO2 cyclic capacity of the KG absorbent up to 0.47 mol/mol. The presence of CO2-rich KG significantly improved the activity of carbonated wollastonite, resulting in decreased critical and median pore diameters and a 25–30% increase in the compressive strength of cement paste. Two mechanisms were proposed to explain this phenomenon: the metastable amorphous calcium carbonate and vaterite in KG-carbonated wollastonite enhance the microstructure of the cement matrix by dissolution–recrystallization and the carbamate in CO2-rich KG solution participates in the precipitation of calcite, forming the inorganic–organic composites with higher thermal stability and better mechanical performance.

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Pretreatment of Coal Fly Ash via Microwave Heating and Silicon Fusing for Synthesis of Zeolites

Zhou,

Hu,

Wang

et al. 2024

Silicon

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Protonated amines mediated CO2 mineralization of coal fly ash and polymorph selection of CaCO3

Cited by 33 publications

References 42 publications

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

CO₂ Activation of Wollastonite Cementitious Material Based on the Mineralization-Desorption of Potassium Glycine Absorbent

Pretreatment of Coal Fly Ash via Microwave Heating and Silicon Fusing for Synthesis of Zeolites

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Protonated amines mediated CO2 mineralization of coal fly ash and polymorph selection of CaCO3

Cited by 33 publications

References 42 publications

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

CO2 Activation of Wollastonite Cementitious Material Based on the Mineralization-Desorption of Potassium Glycine Absorbent

Pretreatment of Coal Fly Ash via Microwave Heating and Silicon Fusing for Synthesis of Zeolites

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CO₂ Activation of Wollastonite Cementitious Material Based on the Mineralization-Desorption of Potassium Glycine Absorbent