Material Balance and Energy Consumption for CO2 Recovery from Moist Flue Gas Employing K2CO3-on-Activated Carbon and Its Evaluation for Practical Adaptation

Shigemoto, Naoya; Yanagihara, Tetsu; Sugiyama, Shigeru; Hayashi, Hiromu

doi:10.1021/ef058027x

Cited by 63 publications

(62 citation statements)

References 5 publications

(5 reference statements)

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“…Since the alkali bicarbonates can be decomposed into carbonates to release CO 2 and H 2 O over a relatively low-temperature range (for example, NaHCO 3 at 70-250 • C), they could be used for CO 2 capture in post-combustion technology. Hence alkali bicarbonates have been the subject of several recent studies [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Density functional theory studies on the electronic, structural, phonon dynamical and thermo-stability properties of bicarbonates MHCO₃, M = Li, Na, K

Duan

Zhang

Sorescu

et al. 2012

J. Phys.: Condens. Matter

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The structural, electronic, phonon dispersion and thermodynamic properties of MHCO 3 (M = Li, Na, K) solids were investigated using density functional theory. The calculated bulk properties for both their ambient and the high-pressure phases are in good agreement with available experimental measurements. Solid phase LiHCO 3 has not yet been observed experimentally. We have predicted several possible crystal structures for LiHCO 3 using crystallographic database searching and prototype electrostatic ground state modeling. Our total energy and phonon free energy (F PH ) calculations predict that LiHCO 3 will be stable under suitable conditions of temperature and partial pressures of CO 2 and H 2 O. Our calculations indicate that the HCO − 3 groups in LiHCO 3 and NaHCO 3 form an infinite chain structure through O · · · H · · · O hydrogen bonds. In contrast, the HCO − 3 anions form dimers, (HCO − 3 ) 2 , connected through double hydrogen bonds in all phases of KHCO 3 . Based on density functional perturbation theory, the Born effective charge tensor of each atom type was obtained for all phases of the bicarbonates. Their phonon dispersions with the longitudinal optical-transverse optical splitting were also investigated. Based on lattice phonon dynamics study, the infrared spectra and the thermodynamic properties of these bicarbonates were obtained. Over the temperature range 0-900 K, the F PH and the entropies (S) of MHCO 3 (M = Li, Na, K) systems vary as F PH (LiHCO 3 ) > F PH (NaHCO 3 ) > F PH (KHCO 3 ) and S(KHCO 3 ) > S(NaHCO 3 ) > S(LiHCO 3 ), respectively, in agreement with the available experimental data. Analysis of the predicted thermodynamics of the CO 2 capture reactions indicates that the carbonate/bicarbonate transition reactions for Na and K could be used for CO 2 capture technology, in agreement with experiments.

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Section: Introductionmentioning

confidence: 99%

Density functional theory studies on the electronic, structural, phonon dynamical and thermo-stability properties of bicarbonates MHCO₃, M = Li, Na, K

Duan

Zhang

Sorescu

et al. 2012

J. Phys.: Condens. Matter

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“…Alkali metal carbonates such as Na 2 CO 3 and K 2 CO 3 react with CO 2 and H 2 O and transform to alkali metal hydrogen carbonates after CO 2 absorption by the following reaction, M 2 CO 3 þ CO 2 þ H 2 O 2MHCO 3 ðM ¼ Na; KÞ [18][19][20][21][22][23][24][25][26][27][28][29]. Water vapor is always necessary in forming potassium hydrogen carbonate in all reactions as shown in the absorption mechanism, unlike alkaline earth metalbased sorbents, while moisture contained in the flue gases as high as 8-17 vol.% negatively affected the adsorption capacity of molecular sieves [9].…”

Section: Introductionmentioning

confidence: 99%

Dry Potassium-Based Sorbents for CO2 Capture

2007

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Dry potassium-based sorbents were prepared by impregnation with potassium carbonate on supports such as activated carbon (AC), TiO 2 , Al 2 O 3 , MgO, CaO, SiO 2 and various zeolites. The CO 2 capture capacity and regeneration property of various sorbents were measured in the presence of H 2 O in a fixed bed reactor, during multiple cycles at various temperature conditions (CO 2 absorption at 50-100°C and regeneration at 130-400°C). The KAlI30, KCaI30, and KMgI30 sorbents formed new structures such as KAl(CO 3 ) 2 (OH) 2 , K 2 Ca(CO 3 ) 2 , K 2 Mg(CO 3 ) 2 , and K 2 Mg(CO 3 ) 2 Á4(H 2 O), which did not completely convert to the original K 2 CO 3 phase at temperatures below 200°C, during the CO 2 absorption process in the presence of 9 vol.% H 2 O. In the case of KACI30, KTiI30, and KZrI30, only a KHCO 3 crystal structure was formed during CO 2 absorption. The formation of active species, K 2 CO 3 Á1.5H 2 O, by the pretreatment with water vapor and the formation of the KHCO 3 crystal structure after CO 2 absorption are important factors for absorption and regeneration, respectively, even at low temperatures (130-150°C). In particular, the KTiI30 sorbent showed excellent characteristics with respect to CO 2 absorption and regeneration in that it satisfies the requirements of a large amount of CO 2 absorption (87 mg CO 2 /g sorbent) without the pretreatment with water vapor, unlike KACI30, and a fast and complete regeneration at a low temperature condition (1 atm, 150°C). In addition, the higher total CO 2 capture capacity of KMgI30 (178.6 mg CO 2 /g sorbent) than that of the theoretical value (95 mg CO 2 /g sorbent) was explained through the contribution of the absorption ability of MgO support. In this review, we introduce the CO 2 capture capacities and regeneration properties of several potassium-based sorbents, the changes in the physical properties of the sorbents before/after CO 2 absorption, and the role of water vapor and its effects on CO 2 absorption.

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“…Shigemoto and Yanagihara (65) outlined the use of Potassium carbonate supported on activated carbon for efficient recovery of CO 2 from moist flue gas.…”

Section: Process Descriptionmentioning

confidence: 99%

Near-Zero Emissions Oxy-Combustion Flue Gas Purification

Shah¹,

Degenstein²,

Zanfir³

et al. 2012

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Material Balance and Energy Consumption for CO₂ Recovery from Moist Flue Gas Employing K₂CO₃-on-Activated Carbon and Its Evaluation for Practical Adaptation

Cited by 63 publications

References 5 publications

Density functional theory studies on the electronic, structural, phonon dynamical and thermo-stability properties of bicarbonates MHCO₃, M = Li, Na, K

Density functional theory studies on the electronic, structural, phonon dynamical and thermo-stability properties of bicarbonates MHCO₃, M = Li, Na, K

Dry Potassium-Based Sorbents for CO2 Capture

Near-Zero Emissions Oxy-Combustion Flue Gas Purification

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Material Balance and Energy Consumption for CO2 Recovery from Moist Flue Gas Employing K2CO3-on-Activated Carbon and Its Evaluation for Practical Adaptation

Cited by 63 publications

References 5 publications

Density functional theory studies on the electronic, structural, phonon dynamical and thermo-stability properties of bicarbonates MHCO3, M = Li, Na, K

Density functional theory studies on the electronic, structural, phonon dynamical and thermo-stability properties of bicarbonates MHCO3, M = Li, Na, K

Dry Potassium-Based Sorbents for CO2 Capture

Near-Zero Emissions Oxy-Combustion Flue Gas Purification

Contact Info

Product

Resources

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Material Balance and Energy Consumption for CO₂ Recovery from Moist Flue Gas Employing K₂CO₃-on-Activated Carbon and Its Evaluation for Practical Adaptation

Density functional theory studies on the electronic, structural, phonon dynamical and thermo-stability properties of bicarbonates MHCO₃, M = Li, Na, K

Density functional theory studies on the electronic, structural, phonon dynamical and thermo-stability properties of bicarbonates MHCO₃, M = Li, Na, K