Adsorption of CO<sub>2</sub> on Hydrotalcite‐like Compounds in a Fixed Bed

Moreira, Regina de Fátima Peralta Muniz; Soares, José Luciano; Casarin, Gustavo L.; Rodrigues, Alı́rio E.

doi:10.1080/01496390500496827

Cited by 49 publications

(45 citation statements)

References 18 publications

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“…The CO 2 loadings at such an equilibrium state were also considerably different than those attained during the initial stages of adsorption or desorption. This kind of unusual behavior of CO 2 on HTlcs at elevated temperatures was consistent with the Langmuir-Hinshelwood type of kinetic model mentioned recently by Moreira et al (2006).…”

Section: Introduction Literature Review and Objectivessupporting

confidence: 91%

“…al., 2001;Soares et. al., 2002 and2004;Moreira et. al., 2006) the actual mechanism appears to be much more complicated than this simple depiction.…”

Section: Introduction Literature Review and Objectivesmentioning

confidence: 99%

“…That value indicated a mass transfer or reaction limited process with CO 2 uptake and release rates lying somewhere in between those reported in the other studies. To further complicate matters, recent results (Moreira et. al., 2006) suggested that the reversible adsorption of CO 2 on HTlcs at elevated temperatures was a kinetically driven, non-equilibrium process that acquires the character of an equilibrium process only after extremely long times.…”

Section: Introduction Literature Review and Objectivesmentioning

confidence: 99%

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New Adsorption Cycles for Carbon Dioxide Capture and Concentration

Ritter¹,

Ebner²,

Reynolds³

et al. 2008

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The objective of this three-year project was to study new pressure swing adsorption (PSA) cycles for CO 2 capture and concentration at high temperature. The heavy reflux (HR) PSA concept and the use of a hydrotalcite like (HTlc) adsorbent that captures CO 2 reversibly at high temperatures simply by changing the pressure were two key features of these new PSA cycles. Through the completion or initiation of nine tasks, a bench-scale experimental and theoretical program has been carried out to complement and extend the process simulation study that was carried out during Phase I (DE-FG26-03NT41799).

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Section: Introduction Literature Review and Objectivessupporting

confidence: 91%

“…al., 2001;Soares et. al., 2002 and2004;Moreira et. al., 2006) the actual mechanism appears to be much more complicated than this simple depiction.…”

Section: Introduction Literature Review and Objectivesmentioning

confidence: 99%

Section: Introduction Literature Review and Objectivesmentioning

confidence: 99%

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New Adsorption Cycles for Carbon Dioxide Capture and Concentration

Ritter¹,

Ebner²,

Reynolds³

et al. 2008

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“…However, the crystalline structures of calcium or magnesium containing hydrotalcites are collapsed above 550°C. The capturing processes have been described for carbon dioxide over calcium or magnesium hydrotalcite in the temperature range 100°C-500°C 1) [14][15][16][17][18][19][20][21]. However, systematic studies are lacking on the capture process for carbon dioxide over magnesium aluminum oxide, lithium silicate, and lithium aluminate at higher temperatures (above 500°C).…”

Section: Introductionmentioning

confidence: 99%

Capture of carbon dioxide over porous solid adsorbents lithium silicate, lithium aluminate and magnesium aluminate at pre-combustion temperatures

Korake

Gaikwad

2010

Front. Chem. Sci. Eng.

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The capturing process for carbon dioxide over porous solid adsorbents such as lithium silicate, lithium aluminate, and magnesium aluminate at pre-combustion temperatures was studied. Lithium silicate was prepared by the sol gel and solid fusion methods. The lithium silicate adsorbent was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), nuclear magnetic resonance (NMR), and surface area. The capturing of carbon dioxide over lithium silicate, lithium aluminate, and magnesium aluminate was explored at different experimental conditions such as exposure time, temperature variation, and exposure carbon dioxide pressure. The capturing process for carbon dioxide was investigated over these adsorbents with variation of their metal mole ratios. The effect of the addition of (promoter) sodium, potassium, and cesium in the lithium silicate adsorbent was explored to investigate the variation of the capture of carbon dioxide over these adsorbents.

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“…At Mount Keith, early consumption of H 2 O and CO 2 resulted in a metasomatic overprint by a Cl-enriched fluid, leading to the high Cl content of the ores, and formation of iowaite-and woodallite-rich ore (Grguric et al 2006). The interlayer anion sites in hydrotalcitelike minerals preferentially select divalent anions, carbonate in particular (e.g., Bish 1980;Miyata 1983), suggesting that they could be used as mineral traps for anthropogenic and atmospheric CO 2 (Moreira et al 2006;Woodhouse 2006). Therefore, the high abundance of hydrotalcite-group minerals found at Mount Keith may provide a unique opportunity for both natural and artificially enhanced carbon sequestration.…”

Section: Introductionmentioning

confidence: 99%

The crystal structure of stichtite, re-examination of barbertonite, and the nature of polytypism in MgCr hydrotalcites

Mills

Whitfield

Wilson

et al. 2010

American Mineralogist

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The crystal structure of stichtite, re-examination of barbertonite and the nature of polytypism in MgCr hydrotalcites Mills, Stuart J.; Whitfield, Pamela S.; Wilson, Siobhan A.; Woodhouse, Joanne N.; Dipple, Gregory M.; Raudsepp, Mati; Francis, Carl A. American Mineralogist, Volume 96, pages 179-187, 2011 AB S T R A C TStichtite, ideally Mg 6 Cr 2 CO 3 (OH) 16 •4H 2 O, from Stichtite Hill, Tasmania, Australia, and barbertonite, also ideally Mg 6 Cr 2 CO 3 (OH) 16 •4H 2 O, from the Kaapsehoop asbestos mine, South Africa, have been studied by powder X-ray diffraction and their structures have been refined using the Rietveld method. Stichtite from Stichtite Hill crystallizes in the rhombohedral space group R3m, with unitcell parameters a = 3.09575(3) and c = 23.5069(6) Å, V = 195.099(6) Å 3 , with Z = 3/8. Barbertonite from the Kaapsehoop asbestos mine crystallizes in the hexagonal space group P6 3 /mmc. The co-type specimens of barbertonite were found to be intergrown mixtures consisting of barbertonite and stichtite. Unit-cell parameters of barbertonite from the co-type specimens were a = 3.09689(6), c = 15.6193(8) Å, and V = 129.731(8) Å 3 and a = 3.09646(6), c = 15.627(1) Å V = 129.76(1) Å 3 , and Z = ¼. Rietveld refinements of both stichtite and barbertonite show that they are polytypes rather than polymorphs and do not represent distinct mineral species. Several possible nomenclature systems are discussed for the naming of hydrotalcite minerals and groups. Raman band assignments are also presented for stichtite from Stichtite Hill.Stichtite and hydrotalcite minerals make up a large proportion of the ore at the Mount Keith nickel mine in Western Australia. Bulk powder diffraction shows the ore contains 6.1 wt% stichtite and 5.6 wt% iowaite. Hydrotalcite group minerals provide an important potential reservoir of CO 2 . At Mount Keith, the amount of CO 2 mined as stichtite could exceed 45 000 metric tons per year, while exchange of Cl for CO 3 could fix in excess of 40 000 metric tons CO 2 per year if end-member iowaite is reacted to form pyaroaurite.

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Adsorption of CO₂ on Hydrotalcite‐like Compounds in a Fixed Bed

Cited by 49 publications

References 18 publications

New Adsorption Cycles for Carbon Dioxide Capture and Concentration

New Adsorption Cycles for Carbon Dioxide Capture and Concentration

Capture of carbon dioxide over porous solid adsorbents lithium silicate, lithium aluminate and magnesium aluminate at pre-combustion temperatures

The crystal structure of stichtite, re-examination of barbertonite, and the nature of polytypism in MgCr hydrotalcites

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Adsorption of CO2 on Hydrotalcite‐like Compounds in a Fixed Bed

Cited by 49 publications

References 18 publications

New Adsorption Cycles for Carbon Dioxide Capture and Concentration

New Adsorption Cycles for Carbon Dioxide Capture and Concentration

Capture of carbon dioxide over porous solid adsorbents lithium silicate, lithium aluminate and magnesium aluminate at pre-combustion temperatures

The crystal structure of stichtite, re-examination of barbertonite, and the nature of polytypism in MgCr hydrotalcites

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Adsorption of CO₂ on Hydrotalcite‐like Compounds in a Fixed Bed