Thermodynamics and kinetics analysis of Ca-looping for CO2 capture: Application of carbide slag

Yang, Jie; Ma, Liping; Liu, Hongpan; Yi, Wei; Bounkhong, Keomounlath; Dai, Quxiu

doi:10.1016/j.fuel.2019.01.018

Cited by 59 publications

(11 citation statements)

References 52 publications

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“…The rate constants of CO 2 capture with MgO·FeO x @NSC at different temperatures were compared (Figure b). The values of k were calculated to be 0.0799, 0.113, and 0.144 min –1 at temperatures of 50, 100, and 200 °C, respectively, indicating the effectiveness of the first-order reaction model for CO 2 adsorption with the MgO·FeO x @NSC material, thus implying that chemical sorption should be the rate-limiting step of the CO 2 capture process. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…The values of k were calculated to be 0.0799, 0.113, and 0.144 min −1 at temperatures of 50, 100, and 200 °C, respectively, indicating the effectiveness of the firstorder reaction model for CO 2 adsorption with the MgO• FeO x @NSC material, thus implying that chemical sorption should be the rate-limiting step of the CO 2 capture process. 33,34 As for the equilibrium adsorption capacity of MgO•FeO x @ NSC, as shown in Figure 3a, the CO 2 equilibrium adsorption capacity quickly increased from 2.27 to 4.57 mol/kg with the temperature increasing from 50 to 100 °C. With the temperature further increasing to 200 °C, the CO 2 equilibrium adsorption capacity decreased to 2.81 mol/kg.…”

Section: Mg(oh)mentioning

confidence: 99%

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Facile Synthesis of MgO Nanoparticle-Embedded Fe/N/S Codoped Carbon Materials from Oily Sludge for Efficient CO₂ Capture

Liu

Shao

2022

ACS EST Eng.

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Oily sludge generated from the modern petrochemical industry is a largescale hazardous solid waste. Pyrolysis with efficient catalysts is considered as a promising technology to convert the oily sludge into value-added chemicals or fuels without significant impact on the environment, but the solid char with spent catalysts does not find an application. In this study, the solid char obtained from catalytic pyrolysis of the oily sludge is applied as an adsorbent for CO 2 capture. The char can be regarded as MgO nanoparticleembedded Fe/N/S codoped carbon (MgO•FeO x @NSC) based on its structure and composition. MgO•FeO x @NSC presents a favorable performance toward CO 2 capture. The maximum CO 2 adsorption capacity is 4.57 mol/kg, and this value remains unchanged for more than 10 cycles of reuse. The mechanism for CO 2 capture is analyzed with Fouriertransform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Physical adsorption and chemical interaction are identified as the primary contributors to the CO 2 adsorption with MgO•FeO x @NSC, in which MgO, nitride-N, and sulfide-S are the main species contributing to the chemical interactions between CO 2 and MgO•FeO

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Section: Results and Discussionmentioning

confidence: 99%

Section: Mg(oh)mentioning

confidence: 99%

Facile Synthesis of MgO Nanoparticle-Embedded Fe/N/S Codoped Carbon Materials from Oily Sludge for Efficient CO₂ Capture

Liu

Shao

2022

ACS EST Eng.

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“…The activation energy can be obtained by combining experimental data by both model fitting and model-free isoconversion rate methods, with values typically ranging from 100 to 230 kJ/mol. − For powdered CaCO 3 calcination kinetics, reported models include the diffusion control model and the chemical reaction control model. Some research demonstrated that the CaCO 3 decomposition mechanism followed the diffusion control model (one-dimensional (1D) or two-dimensional (2D)). , Numerous investigations have confirmed the predominance of the chemical mechanism (phase boundary or nucleation and nuclear growth). − Additionally, there are also some studies on the effect of CaCO 3 physicochemical features, heating rate, and CO 2 partial pressure on the chemical reaction mechanism. ,− …”

Section: Introductionmentioning

confidence: 99%

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping

Guo

Xue

et al. 2023

Ind. Eng. Chem. Res.

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Calcium looping-based CO2 capture is generally considered more efficient than conventional postcombustion CO2 capture. Calcium carriers’ calcination in the regenerator is crucial because proper operating parameters can provide regenerated carriers suitable for the gasifier and prevent sintering. This work focuses on the calcination behavior of CaCO3 in calcium looping systems. In this study, the calcination kinetic parameters under various conditions were investigated using a model-free isoconversional method based on nonisothermal thermogravimetric analysis in a macroscope, in combination with X-ray diffraction tests of the samples in a microscope. Results in the macroscope showed that the apparent activation energy ranges from 121.8 to 163.0 kJ/mol under a conversion range of 0.3–0.9, and the CaCO3 calcination mechanism involves transient nucleation and two-dimensional growth. Results observed from the microscope demonstrated that CaCO3 tends to be calcined on a plane, consistent with the macroscope model with two-dimensional nucleation. Since the microscopic mechanism is reflected, the kinetic model can be widely adopted, and calcium-based carrier modification strategies can also be proposed to prevent sintering of the carrier perpendicular to the (1̅04) plane.

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“…The composition of CS includes Ca(OH) 2 , CaCO 3 , and small amounts of MgO, SiO 2 , Al 2 O 3 , Fe 2 O 3 [47]. The annual output of CS is about 5:6 × 10 7 tons in China [48]. CS can be used as raw material to prepare cement binder or acid gas absorbent.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Glycerol Carbonate from Glycerol and Dimethyl Carbonate Catalyzed by Solid Base Catalyst Derived from Waste Carbide Slag

Wang

Wang²,

Liu

et al. 2021

International Journal of Polymer Science

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Na2CO3 was loaded onto waste carbide slag (CS) by impregnation-calcination method to prepare the solid base catalyst, which was used to synthesize glycerol carbonate (GC) by the transesterification of glycerol with dimethyl carbonate (DMC). The prepared catalysts were characterized by a scanning electron microscope (SEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Brunner−Emmet−Teller (BET) techniques. The catalyst 15 wt.% Na2CO3-CS-800, which was prepared by impregnating CS to the Na2CO3 solution with the concentration of 15 wt.% weight of CS and calcined at 800°C for 3 hours, showed an excellent catalytic ability. When it was applied in the catalytic synthesis of GC, 98.1% glycerol conversion and 96.0% GC yield were achieved in 90 mins at 75°C with the catalyst dosage of 3 wt.% to total reactants and the DMC to glycerol molar ratio of 5. More importantly, the loading of Na2CO3 can effectively improve the reusability of catalyst. The 15 wt.% Na2CO3-CS-800 can still achieve 83.6% glycerol conversion and 80.5% GC yield after five-time reuse. Meanwhile, under the same reaction conditions, the CS-800, which was obtained by calcining CS at 800°C for 3 hours, experienced significant activity reduction with only 15.2% glycerol conversion and 14.1% GC yield after five-time reuse. FTIR and XRD characterization revealed that CO32- might play a key role in preserving active catalytic CaO component by forming protective CaCO3 shell on the catalyst surface.

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Thermodynamics and kinetics analysis of Ca-looping for CO2 capture: Application of carbide slag

Cited by 59 publications

References 52 publications

Facile Synthesis of MgO Nanoparticle-Embedded Fe/N/S Codoped Carbon Materials from Oily Sludge for Efficient CO₂ Capture

Facile Synthesis of MgO Nanoparticle-Embedded Fe/N/S Codoped Carbon Materials from Oily Sludge for Efficient CO₂ Capture

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping

Synthesis of Glycerol Carbonate from Glycerol and Dimethyl Carbonate Catalyzed by Solid Base Catalyst Derived from Waste Carbide Slag

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Thermodynamics and kinetics analysis of Ca-looping for CO2 capture: Application of carbide slag

Cited by 59 publications

References 52 publications

Facile Synthesis of MgO Nanoparticle-Embedded Fe/N/S Codoped Carbon Materials from Oily Sludge for Efficient CO2 Capture

Facile Synthesis of MgO Nanoparticle-Embedded Fe/N/S Codoped Carbon Materials from Oily Sludge for Efficient CO2 Capture

Investigations on Kinetics and Mechanisms of CaCO3 Calcination in Calcium Looping

Synthesis of Glycerol Carbonate from Glycerol and Dimethyl Carbonate Catalyzed by Solid Base Catalyst Derived from Waste Carbide Slag

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Product

Resources

About

Facile Synthesis of MgO Nanoparticle-Embedded Fe/N/S Codoped Carbon Materials from Oily Sludge for Efficient CO₂ Capture

Facile Synthesis of MgO Nanoparticle-Embedded Fe/N/S Codoped Carbon Materials from Oily Sludge for Efficient CO₂ Capture

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping