Kinetics of CaCO3 decomposition at low CO2 partial pressure in a vacuum fixed bed

Yue, Wenfei; Song, Wenli; Fan, Chengpeng; Li, Songgeng

doi:10.1016/j.ces.2023.118646

Cited by 8 publications

(2 citation statements)

References 41 publications

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“…From Table 6, it can be seen that the specific surface area of the raw sludge decreased by about 40% after combustion compared with that without combustion, indicating that sludge melting occurred at 900 • C. After adding 4% CaO, there was a certain degree of improvement in the pore structure of sludge solid phase products, suggesting that adding CaO would inhibit the sintering of the sludge during combustion. With the addition of 4% CaO, the specific surface area and pore volume of the sludge solid phase products increased to a certain extent after the passage of CO 2 compared to working condition T3, which might be due to the decomposition reaction of CaCO 3 as shown in Equation ( 6) at 900 • C to produce more pore-like structures [42][43][44]. This reduced the diffusion resistance of heavy metal vapors but provided more reactive active sites for heavy metals, which facilitated their immobilization.…”

Section: Porosity Structure Analysismentioning

confidence: 99%

Experimental and DFT Studies of Influence of Flue Gas Components on the Interaction between CaO and As during Sludge Combustion

Shi,

Zhang,

et al. 2024

Energies

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The problem of As pollution emission from sludge during combustion has received widespread attention. The impact of flue gas components on the interaction with CaO and As during sludge combustion was analyzed using a series of experimental characterization methods. The strength of the activity of As2O3 on the CaO(001) surface as well as on the CO2/SO2/H2O+CaO(001) surface with different O adsorption sites was revealed by combining with Density Functional Theory (DFT). According to the results, CO2 in the flue gas reacted with CaO in a reversible carbonation reaction, which optimized the pore structure of the solid phase products and promoted the capture of As by CaO. SO2 in the flue gas reacted with CaO in a sulfation reaction reaction to block the pores, which was not conducive to the capture of As by CaO. The presence of moisture led to poor pore structure collapse of the solid phase products as well as the formation of gehlenite, which reduced the enrichment of As by CaO. DFT calculations showed that the adsorption of As2O3 molecules on the CO2+CaO(001) surface was affected by the position of the O active site, and the adsorption energy at the OC1 top site was higher than that on the clean surface, which was favorable for the stable adsorption of As2O3 molecules. The existence of SO2 decreased As2O3 molecules’ adsorption energy on the CaO(001) surface, which was unfavorable for the adsorption of As2O3 molecules. There were two main effects of H2O molecules on the adsorption of As2O3 on the CaO(001) surface. One was the H2O molecules weakened the interaction between the As atoms and Osurf atoms, which was unfavorable to the adsorption of As2O3 molecules; the other was the existence of stronger adsorption of O atoms in H2O molecules on As atoms in As2O3 molecules, which made As2O3 molecules adsorbed at the top of OH0 adsorbed with adsorption energies much larger than that of clean surface, and the adsorption was more stable.

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Section: Porosity Structure Analysismentioning

confidence: 99%

Experimental and DFT Studies of Influence of Flue Gas Components on the Interaction between CaO and As during Sludge Combustion

Shi,

Zhang,

et al. 2024

Energies

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“…The decomposition of CaCO 3 starts from 700 °C, producing CaO. 30 Trubitsyn et al 31 found that CaO can react with Al 2 O 3 to form Ca 12 Al 14 O 33 at 430 °C. Mazzucato et al 32 found that CaO can react with SiO 2 at temperatures as low as 700 °C.…”

Section: Mechanisms Of Mono-peak and Dual-peak Chlorine Releasesmentioning

confidence: 99%

Effect of granulation on chlorine-release behavior during municipal solid waste incineration

Xie,

Wu,

et al. 2023

RSC Adv.

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Evolution of sample optical pathlength during diffuse reflectance FT-IR analyses

et al. 2023

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Kinetics of CaCO3 decomposition at low CO2 partial pressure in a vacuum fixed bed

Cited by 8 publications

References 41 publications

Experimental and DFT Studies of Influence of Flue Gas Components on the Interaction between CaO and As during Sludge Combustion

Experimental and DFT Studies of Influence of Flue Gas Components on the Interaction between CaO and As during Sludge Combustion

Effect of granulation on chlorine-release behavior during municipal solid waste incineration

Evolution of sample optical pathlength during diffuse reflectance FT-IR analyses

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