Kinetic analysis of the carbonation reactions for the capture of CO2 from air via the Ca(OH)2–CaCO3–CaO solar thermochemical cycle

Nikulshina, V.; Gálvez, María Elena; Steinfeld, Aldo

doi:10.1016/j.cej.2006.11.003

Cited by 186 publications

(132 citation statements)

References 24 publications

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“…The results obtained from direct gas-solid carbonation of natural alkaline oxides, such as MgO and CaO, provide the basis for applying this route to the carbonation of alkaline residues, since such materials are largely composed of calcium and magnesium oxides or hydroxides. Nikulshina et al [15] investigated CaO and Ca(OH) 2 carbonation, observing that the addition of water vapor significantly enhances the reaction kinetics to the extent that, in the first 20 min, the reaction proceeds at a rate that is 22 and 9 times faster than that observed for the dry carbonation of CaO and Ca(OH) 2 . The first study dealing with direct gas/solid carbonation of alkaline residues was by Jia and Anthony [16], who performed pressurized TGA experiments of hydrated and non-hydrated fluidized bed combustion ash, achieving CaO conversion efficiencies up to 60% when operative at temperatures above 400 • C and in a 100% CO 2 atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Gas–solid carbonation kinetics of Air Pollution Control residues for CO2 storage

Prigiobbe

Polettini

Baciocchi

2009

Chemical Engineering Journal

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a b s t r a c tGas-solid carbonation of Air Pollution Control (APC) residues is a CO 2 Capture and Storage (CCS) technology, where highly reactive Mg-or Ca-bearing materials adsorb CO 2 and form stable Mg-or Ca-carbonates. The carbonation kinetics of this reaction have been studied at different temperatures, CO 2 concentrations, and at atmospheric pressure in order to select the best operative conditions on the basis of CO 2 stored and reaction time. The samples were initially heated up to the operative conditions under argon atmosphere and then carbonated under a CO 2 -argon atmosphere. All carbonation kinetics were characterized by a rapid chemically controlled reaction followed by a slower product layer diffusion-controlled process. Maximum conversions between 60% and 80% were achieved, depending on the operative temperature and CO 2 concentration. Temperature did not notably affect the maximum conversion obtained in the experiments performed at temperatures equal or above 400• C; the influence on the kinetics was masked by the change in initial composition due to dehydroxylation reaction and surface area while heating up to the operative temperature. A slight influence of CO 2 concentration on the kinetics was observed, whereas no influence on the maximum conversion was noticed. The obtained results suggest that the flue gases with 10 vol.% CO 2 concentration can be directly used to form stable carbonates, thus lumping capture and storage in a single step. The APC residues produced from the existing incineration plants would cover only 0.02-0.05% of the total CO 2 European storage capacity required to comply with the Kyoto protocol objectives. Nevertheless, the proposed carbonation route could be applied to other residues, such as Cement Kiln Dust, Paper mill residues and Stainless Steel Desulphurization slags, characterized by a high content of free calcium oxides and hydroxides, thus increasing the impact of this process option.

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Section: Introductionmentioning

confidence: 99%

Gas–solid carbonation kinetics of Air Pollution Control residues for CO2 storage

Prigiobbe

Polettini

Baciocchi

2009

Chemical Engineering Journal

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“…A summary of rate equations for the carbonation reaction is shown in Table 2. Nikulshina et al (2007) conducted a thermogravimetric (TG) analysis of the carbonation of CaO and Ca(OH) 2 using atmospheric levels of CO 2 . The CaO carbonation reaction rate was chemically controlled initially and switched to a diffusion controlled regime after 20 minutes due to formation of a CaCO 3 product layer.…”

Section: Carbonation Kineticsmentioning

confidence: 99%

“…7. A wide variety of synthetic sorbents designed to reduce degradation over multiple cycles have been studied recently, including calcium aluminate supported CaO (Manovic and Anthony, Acharya et al (2012) (1 ) (Nikulshina et al, 2007). Reproduced with permission from Elsevier.…”

Section: Sorbent Degradationmentioning

confidence: 99%

Towards Solar Thermochemical Carbon Dioxide Capture via Calcium Oxide Looping: A Review

Reich

Yue

Bader

et al. 2014

Aerosol Air Qual. Res.

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“…This improved rate of reaction with the addition of steam appears to enable CO 2 to penetrate further into the pellet, concurring with similar observations seen previously in the literature. [29][30][31] However, it may also be an effect of changing porosity linked to the formation of Ca(OH) 2 (especially additional porosity that is formed upon heating the hydroxide phase), especially considering the total extent of carbonation appears unchanged as compared to the pure CO 2 experiments. …”

Section: Inuence Of Steam On Carbonation Observed By In Situ Xrdmentioning

confidence: 99%

In situstudies of materials for high-temperature CO₂capture and storage

Dunstan¹,

Wen²,

Pavan³

et al. 2015

Acta Cryst Sect A

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Carbon capture and storage (CCS) offers a possible solution to curb the CO 2 emissions from stationary sources in the coming decades, considering the delays in shifting energy generation to carbon neutral sources such as wind, solar and biomass. The most mature technology for post-combustion capture uses a liquid sorbent, amine scrubbing. However, with the existing technology, a large amount of heat is required for the regeneration of the liquid sorbent, which introduces a substantial energy penalty.The use of alternative sorbents for CO 2 capture, such as the CaO-CaCO 3 system, has been investigated extensively in recent years. However there are significant problems associated with the use of CaO based sorbents, the most challenging one being the deactivation of the sorbent material. When sorbents such as natural limestone are used, the capture capacity of the solid sorbent can fall by as much as 90 mol% after the first 20 carbonation-regeneration cycles. In this study a variety of techniques were employed to understand better the cause of this deterioration from both a structural and morphological standpoint. X-ray and neutron PDF studies were employed to understand better the local surface and interfacial structures formed upon reaction, finding that after carbonation the surface roughness is decreased for CaO. In situ synchrotron X-ray diffraction studies showed that carbonation with added steam leads View Article OnlineView Journal | View Issue to a faster and more complete conversion of CaO than under conditions without steam, as evidenced by the phases seen at different depths within the sample. Finally, in situ X-ray tomography experiments were employed to track the morphological changes in the sorbents during carbonation, observing directly the reduction in porosity and increase in tortuosity of the pore network over multiple calcination reactions.

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Kinetic analysis of the carbonation reactions for the capture of CO2 from air via the Ca(OH)2–CaCO3–CaO solar thermochemical cycle

Cited by 186 publications

References 24 publications

Gas–solid carbonation kinetics of Air Pollution Control residues for CO2 storage

Gas–solid carbonation kinetics of Air Pollution Control residues for CO2 storage

Towards Solar Thermochemical Carbon Dioxide Capture via Calcium Oxide Looping: A Review

In situstudies of materials for high-temperature CO₂capture and storage

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Kinetic analysis of the carbonation reactions for the capture of CO2 from air via the Ca(OH)2–CaCO3–CaO solar thermochemical cycle

Cited by 186 publications

References 24 publications

Gas–solid carbonation kinetics of Air Pollution Control residues for CO2 storage

Gas–solid carbonation kinetics of Air Pollution Control residues for CO2 storage

Towards Solar Thermochemical Carbon Dioxide Capture via Calcium Oxide Looping: A Review

In situstudies of materials for high-temperature CO2capture and storage

Contact Info

Product

Resources

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In situstudies of materials for high-temperature CO₂capture and storage