A green and scalable synthesis of highly stable Ca-based sorbents for CO<sub>2</sub> capture

Yan, Feng; Jiang, Jianguo; Zhao, Ming; Tian, Sicong; Li, Kaimin; Li, Tianran

doi:10.1039/c4ta06639a

Cited by 44 publications

(33 citation statements)

References 46 publications

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“…The inert material was confirmed to be gehlenite (Ca 2 Al 2 SiO 7 ) from XRD diffraction peaks ( Figure 2) at 2θ = 29.15, 31.43 and 52.12° for (2 0 1), (2 1 1) and (3 1 2) reflections, respectively (JCPDS 89-6887). 42 Gehlenite with a comparatively high melting point (1593°C , Table S2) generally exhibits good thermal durability, 43 and thus act as a physical barrier to prevent sintering and aggregation of CaCO 3 nanoparticles during calcination. Therefore, the high CO 2 capture capacity of the synthetic sorbent was maintained over multiple carbonation-calcination cycles.…”

Section: Resultsmentioning

confidence: 99%

Performance of Coal Fly Ash Stabilized, CaO-based Sorbents under Different Carbonation–Calcination Conditions

Yan

Jiang

et al. 2015

ACS Sustainable Chem. Eng.

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The rapid deactivation of CaO sorbents due to sintering currently presents a major barrier to calcium looping for CO 2 capture. In this work, we report an easy method for synthesizing highly stable CaO-based sorbents through mechanical mixing of a calcium precursor and coal fly ash (solid waste from coal-fired plants). To investigate the stable performance of as-synthesized sorbents, the effects of calcium precursors and carbonation-calcination conditions were studied and discussed. The synthetic sorbent derived from calcium oxalate (90%CaC 2 O 4 -FA-2h) showed the best performance and demonstrated a CO 2 uptake of 0.38 g(CO 2 ) g(CaO) -1 after 30 cycles. Even under the most severe calcination condition (at 920ºC in pure CO 2 ), this sorbent maintained a stable capture capacity, with a final CO 2 uptake of 0.27 g(CO 2 ) g(CaO) -1 and an average decay rate of only 0.29% per cycle. Characterization of the sorbents confirmed that the formation of dispersed inert phase (gehlenite, Ca 2 Al 2 SiO 7 ) was responsible for this high cyclic CO2 uptake and strong sintering resistance. This strategy significantly enhances the high temperature stability of CaO-based sorbents through in-situ reuse of coal fly ash, and is thus an effective approach to CO 2 capture from the large point source.

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Section: Resultsmentioning

confidence: 99%

Performance of Coal Fly Ash Stabilized, CaO-based Sorbents under Different Carbonation–Calcination Conditions

Yan

Jiang

et al. 2015

ACS Sustainable Chem. Eng.

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“…[184][185][186] In addition to the high capturec apacity (17.86 mmol g À1 ), the main advantages of CaO-based CO 2 sorbents are environmental friendliness, nontoxicity,s uitability for use in pre-and postcombustion processes, easy use in fluidized-bed reactors, and the possibility for using spent sorbents for cementp roduction. [8,190] To overcome these problems, several approaches have been studied,i ncluding 1) improvements in the synthetic method, 2) changes in microstructure, 3) surfacem odification, 4) mixture with other metal oxides, 5) enhancing attrition resistance, 6) reactivation of degraded sorbents, and 7) the use of other calcium-based natural minerals. [8,190] To overcome these problems, several approaches have been studied,i ncluding 1) improvements in the synthetic method, 2) changes in microstructure, 3) surfacem odification, 4) mixture with other metal oxides, 5) enhancing attrition resistance, 6) reactivation of degraded sorbents, and 7) the use of other calcium-based natural minerals.…”

Section: Solid-waste-derived Calcium-based Co 2 Sorbentsmentioning

confidence: 99%

“…[187][188][189] However,t he main problems of CaO-based sorbents are low reversibility and easy sintering during the sorption/desorptionp rocess. [8,190] To overcome these problems, several approaches have been studied,i ncluding 1) improvements in the synthetic method, 2) changes in microstructure, 3) surfacem odification, 4) mixture with other metal oxides, 5) enhancing attrition resistance, 6) reactivation of degraded sorbents, and 7) the use of other calcium-based natural minerals. [191][192][193] Recently,s ome Ca-rich waste materials have been used as cheap raw materials to produce CaO-based CO 2 sorbents.…”

Section: Solid-waste-derived Calcium-based Co 2 Sorbentsmentioning

confidence: 99%

Solid‐Waste‐Derived Carbon Dioxide‐Capturing Materials

et al. 2019

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Solid sorbents are considered to be promising materials for carbon dioxide capture. In recent years, many studies have focused on the use of solid waste as carbon dioxide sorbents. The use of waste resources as carbon dioxide sorbents not only leads to the development of relatively low‐cost materials, but also eliminates waste simultaneously. Different types of waste materials from biomass, industrial waste, household waste, and so forth were used as carbon dioxide sorbents with sufficient carbon dioxide capture capacities. Herein, progress on the development of carbon dioxide sorbents produced from waste materials is reviewed and covers key factors, such as the type of waste, preparation method, further modification method, carbon dioxide sorption performance, and kinetics studies. In addition, a new research direction for further study is proposed. It is hoped that this critical review will not merely sum up the major research directions in this field, but also provide significant suggestions for future work.

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“…http://Fly ash, the solid waste emitted from coal‐fired boilers and captured by pollution control equipment, has large amount of silica and alumina (80–85%) generally in the form of inactive mullite and glass phase. Using fly ash to modify calcium‐based sorbent has presented promising enhancement in CO 2 capture capacity by improving the microstructure and sintering resistant of the sorbents . A better understanding of the carbonation kinetics of these sorbents is really important to applying it in industrials as a key factor for reactor design and application.…”

Section: Introductionmentioning

confidence: 99%

“…Using fly ash to modify calcium-based sorbent has presented promising enhancement in CO 2 capture capacity by improving the microstructure and sintering resistant of the sorbents. 13,[30][31][32] A better understanding of the carbonation kinetics of these sorbents is really important to applying it in industrials as a key factor for reactor design and application. Model-fitting involves fitting models to temperature curves and simultaneously determining the activation energy E and pre-exponential factor A.…”

Section: Introductionmentioning

confidence: 99%

Carbonation kinetics of fly‐ash‐modified calcium‐based sorbents for CO₂ capture

et al. 2017

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Calcium looping technology is one of the most promising technologies for CO2 capture. Nevertheless, one of the major problems for this technology is the rapid decay in CO2 capture performance of calcium‐based sorbents during the calcination/carbonation cycles. It is essential to improve the sorbents’ CO2 capture capacity and maintain their long‐term performance during the cycles, especially in a cost‐effective and environmentally benign method for further development of the technology. Calcium‐based sorbents modified with fly ash present great potential for enhancing CO2 capture capacity. Carbonation kinetics of the modified sorbents, an important factor for CO2 capture system design, is critical for exploring its application. The carbonation rate of the modified sorbents has been investigated and the main parameters such as activation energy and pre‐exponential factor have been calculated. Logistic and Avrami fractional kinetics models show better fitting regression, as indicated with a high regression coefficient R2 of 0.987–0.999. The models well describe the CO2 carbonation kinetics behavior of the modified sorbents, since they have considered the multi‐step reaction mechanisms including film diffusion, intra‐particle diffusion, and the interaction with active sites, and have an acceptable average relative error between calculated and experimental data, for example 0.618–6.39% and 4.24–5.39% for the modified sorbents at chemical‐controlled reaction and diffusion‐controlled reaction, respectively. Activation energy and pre‐exponential factor at chemical‐controlled reaction are E1 = 15.019 kJ/mol, k01 = 5.940 mol/(m2s) and E2 = 12.252 kJ/mol, k02 = 3.195 mol/(m2s) for modified sorbents CaO/FA Hyd (50%AC) and CaO/PFA(cal)Hyd, respectively. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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A green and scalable synthesis of highly stable Ca-based sorbents for CO₂ capture

Abstract: A highly stabilizing effect of fly ash on CaO-based sorbents under severe calcination conditions.

Cited by 44 publications

References 46 publications

Performance of Coal Fly Ash Stabilized, CaO-based Sorbents under Different Carbonation–Calcination Conditions

Performance of Coal Fly Ash Stabilized, CaO-based Sorbents under Different Carbonation–Calcination Conditions

Solid‐Waste‐Derived Carbon Dioxide‐Capturing Materials

Carbonation kinetics of fly‐ash‐modified calcium‐based sorbents for CO₂ capture

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A green and scalable synthesis of highly stable Ca-based sorbents for CO2 capture

Abstract: A highly stabilizing effect of fly ash on CaO-based sorbents under severe calcination conditions.

Cited by 44 publications

References 46 publications

Performance of Coal Fly Ash Stabilized, CaO-based Sorbents under Different Carbonation–Calcination Conditions

Performance of Coal Fly Ash Stabilized, CaO-based Sorbents under Different Carbonation–Calcination Conditions

Solid‐Waste‐Derived Carbon Dioxide‐Capturing Materials

Carbonation kinetics of fly‐ash‐modified calcium‐based sorbents for CO2 capture

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Product

Resources

About

A green and scalable synthesis of highly stable Ca-based sorbents for CO₂ capture

Carbonation kinetics of fly‐ash‐modified calcium‐based sorbents for CO₂ capture