Calcium Carbonate Decomposition in Carbon Dioxide Atmosphere

Hyatt, Edmond P.; Cutler, Ivan B.; Wadsworth, M.E.

doi:10.1111/j.1151-2916.1958.tb13521.x

Cited by 121 publications

(96 citation statements)

References 6 publications

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“…According to our results, the ratio between the carbonation rates of the fast reaction regime to those of the slow one is about two orders. This is in accordance with the results of both Hyatt et al (1958) and Barker (1973).…”

Section: Resultssupporting

confidence: 82%

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

Smirniotis¹

2005

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For earlier studies it was found that calcium oxide is a promising sorbent for adsorption of carbon dioxide. Ca(NO 3 ) 2 ·4H 2 O, CaO, Ca(OH) 2 , CaCO 3 , and Ca(CH 3 COO) 2 ·H 2 O were used as precursors for synthesis of CaO sorbents on this work. The sorbents prepared from calcium acetate (CaAc 2 -CaO) resulted in the best uptake characteristics for CO 2 . It possessed higher BET surface area and higher pore volume than the other sorbents. According to SEM images, this sorbent shows "fluffy" structure, which probably contributes to its high surface area and pore volume. When temperatures were between 550 and 800 o C, this sorbent could be carbonated almost completely. Moreover, the carbonation progressed dominantly at the initial short period. Under numerous adsorption-desorption cycles, the CaAc 2 -CaO demonstrated the best reversibility, even under the existence of 10 vol % water vapor. In a 27 cyclic running, the sorbent sustained fairly high carbonation conversion of 62%. Pore size distributions indicate that their pore volume decreased when experimental cycles went on. Silica was doped on the CaAc 2 -CaO in various weight percentages, but the resultant sorbent did not exhibit better performance under cyclic operation than those without dopant .Extensive work is under progress to find the influence of refractory dopants to performance of CaO sorbents.Calcium oxides synthesized by flame spray pyrolysis and high temperature calcination were compared as sorbents of carbon dioxide. Flame made sorbents are solid nanoparticles with specific surface areas as high as 68 m 2 /g. At 700 o C, all sorbents showed comparable fast carbonation rates during the first minutes and comparable maximum conversion with carbon dioxide during five hours adsorption. All samples showed high carbonation conversion of more than 95% over the first several cyclic adsorption/desorption periods. Experiments of long term cyclic adsorption/desorption showed that the sorbents synthesized from the flame pyrolysis had good durability. Its carbonation conversion was still stable around 50% after 60 cyclic running. Executive SummaryFive precursors were used to synthesize CO 2 sorbents in this work. CaO sorbents prepared from calcium acetate monohydrate were identified as the best candidate for the adsorption of CO 2 . In a wide operation window of 550-800 o C, this sorbent achieved a high carbonation of more than 94%. When the adsorption temperature was 700 o C, about 90% of the sorbent reacted with CO 2 within the first 10 min of the carbonation. The CaAc 2 -CaO also showed capability of maintaining its reversibility over multi adsorption-desorptions, even under the existence of 10 vol % water vapor. In a 27 cyclic adsorption-desorption experiment, the sorbent still sustained fairly high conversion of 62%, of which the adsorptions were conducted under 30 vol% CO 2 (balanced in helium), 700 o C and desorptions conducted under helium, 700 o C. When "refractory" silica was doped on these sorbents, it didn't apparently enha...

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Section: Resultssupporting

confidence: 82%

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

Smirniotis¹

2005

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“…It is clear that the reaction at the interface CaCO 3 -CaO is complex and not fully understood. Several workers have suggested that the non-linear dependence found for the effect of CO 2 on the calcination rate could be due to the existence of a sorption process at the calcination surface (Hyatt, Cutler & Wadsworth, 1958;Wang & Thomson, 1995;Khinast et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Calcination of calcium-based sorbents at pressure in a broad range of CO2 concentrations

Garcı́a-Labiano

Diego

Gayán

et al. 2002

Chemical Engineering Science

271

229

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The calcination reaction of two limestones and a dolomite with different porous structures was studied by thermogravimetric analysis. The effects of calcination temperature (1048-1173 K), particle size (0.4-2.0 mm), CO 2 concentration (0-80 %) and total pressure (0.1-1.5 MPa) were investigated. SEM analysis indicated the existence of two different particle calcination models depending on the sorbent type: a shrinking core model with a sharp limit between the uncalcined and calcined parts of the particle and a grain model with changing calcination conversion at the particle radial position. The appropriate reaction model was used to determine the calcination kinetic parameters of each sorbent. Chemical reaction and mass transport in the particle porous system were the main limiting factors of the calcination reaction at the experimental conditions. A Langmuir-Hinshelwood type kinetic model using the Freundlich isotherm was proposed to account the effect of the CO 2 during sorbent calcination. This allowed us to predict the calcination conversion of very different sorbents in a broad range of CO 2 partial pressures. Total pressure also inhibited the sorbent calcination. This fact was accounted by an additional decrease in the molecular diffusion coefficient with increasing total pressure with respect to the indicated by the Fuller's equation.

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“…The calcination rate increases monotonically with decreasing absolute pressure because of reduced intraparticle mass transfer resistances and increased driving force (Hyatt, Cutler, & Wadsworth, 1958;Sakadjian et al, 2007). Increased pressure results in an increase in the internal mass transfer resistances in the sorbent porous network.…”

Section: Calcination Kineticsmentioning

confidence: 98%