Single step fabrication of spherical CaO pellets via novel agar-assisted moulding technique for high-temperature CO2 capture

Hu, Yingchao; Lu, Hongyuan; Li, Hailong

doi:10.1016/j.cej.2020.127137

Cited by 25 publications

(5 citation statements)

References 73 publications

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“…Another approach to yield different morphologies of the sorbent particles is to use different precursors and precursor treatments. Early on, the CO 2 uptake of CaO derived from different calcium-based precursors, including calcium hydroxide (Ca(OH) 2 ), calcium propanoate (Ca(C 2 H 5 COO) 2 ), calcium acetylacetonate hydrate (Ca(C 5 H 7 O 2 ) 2 ), calcium acetate (Ca(CH 3 COO) 2 ), calcium d -gluconate monohydrate (Ca(C 6 H 11 O 7 ) 2 ·H 2 O), calcium L-lactate hydrate (Ca(C 2 H 5 O 3 ) 2 ·H 2 O), calcium citrate tetrahydrate (Ca 3 (C 6 H 5 O 7 ) 2 ·4H 2 O), calcium nitrate tetrahydrate (Ca(NO 3 ) 2 ·4H 2 O), calcium formate (Ca(HCOO) 2 ), calcium oxalate (CaC 2 O 4 ), and calcium 2-ethylhexanoate, has been compared. ,,− Depending on the type of precursor used, the transition to CaO occurs in several steps; the transition route affects the morphology of the sorbent (including surface area and pore volume distribution) and the crystallite size of the CaO, which all influence the CO 2 uptake performance of the resulting CaO. The combination of different precursors and pretreatment conditions (i.e., temperature, heating rate, p CO 2 , and p H 2 O ) provide rich opportunities to tune the physical properties of the CaO.…”

Section: Mechanistic Insights Into Parameters Influencing Co2 Absorpt...mentioning

confidence: 99%

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

et al. 2021

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Carbon dioxide capture and mitigation form a key part of the technological response to combat climate change and reduce CO2 emissions. Solid materials capable of reversibly absorbing CO2 have been the focus of intense research for the past two decades, with promising stability and low energy costs to implement and operate compared to the more widely used liquid amines. In this review, we explore the fundamental aspects underpinning solid CO2 sorbents based on alkali and alkaline earth metal oxides operating at medium to high temperature: how their structure, chemical composition, and morphology impact their performance and long-term use. Various optimization strategies are outlined to improve upon the most promising materials, and we combine recent advances across disparate scientific disciplines, including materials discovery, synthesis, and in situ characterization, to present a coherent understanding of the mechanisms of CO2 absorption both at surfaces and within solid materials.

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Section: Mechanistic Insights Into Parameters Influencing Co2 Absorpt...mentioning

confidence: 99%

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

et al. 2021

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“…When the CaCl 2 concentration was 0.06, 0.2, and 0.3 mol/L, relatively large spherical particles were formed, which affected the ability of CO 2 to diffuse into the interior of the adsorbent during adsorption. Additionally, stable spatial structures cannot be formed by dispersed particles; when gas enters, it is easy to form dispersed CaCO 3 , which easily breaks and wears, leading to collapse 53 . Therefore, 0.08 mol/L was chosen as the optimal CaCl 2 concentration.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, stable spatial structures cannot be formed by dispersed particles; when gas enters, it is easy to form dispersed CaCO 3 , which easily breaks and wears, leading to collapse. 53 Therefore, 0.08 mol/L was chosen as the optimal CaCl 2 concentration.…”

Section: Sem Characterizationmentioning

confidence: 99%

Controlled preparation of CaO adsorbents by microsyringe titration technology for CO₂ capture

Zhang

et al. 2022

Greenhouse Gases

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CaCO3 precursors were prepared by a simple titration method by dropping CaCl2 solution into a CO2 storage material (CO2SM) solution using a syringe pump; afterward, the precursors were roasted at 900°C to form CaO adsorbents for CO2 adsorption at 750°C for 2 h. Subsequently, the CO2SM dosage, CaCl2 concentration, drip speed, temperature, and stirring speed were systemically optimized by designing single‐factor experiments. Further, a three‐factor and three‐level response surface experiment was designed to investigate the interactions among the factors according to their effects on CO2 adsorption. After optimizing the preparation conditions, the CO2 adsorption capacity reached 739.6 mg/g. Fifteen adsorption cycles were conducted on the adsorbent under the optimal preparation conditions, and the adsorption performance was reduced by 52.8%. Finally, the formation mechanism of CaCO3 and the CO2 adsorption processes of CaO were discussed using a Fourier‐transform infrared spectrometer (FTIR), X‐ray diffractometer (XRD), scanning electron microscope (SEM), and high‐resolution transmission electron microscope (HR‐TEM). © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…In CS, in addition to the main element Ca, C, Si, Al, and Fe, are also present. These elements may react with Ca during the thermal decomposition of Ca(OH) 2 . − For example, CaO can react with C to form Ca and simultaneously release CO, and C may react with gaseous H 2 O to form CO and CO 2 . Yin et al reported that CaCO 3 decomposition is affected by its particle size, temperature, and CO 2 concentration .…”

Section: Introductionmentioning

confidence: 99%

An Innovative Approach to Prepare Calcium Oxide from Calcium Carbide Slag Based on Sequential Mineral Transformation

Ma,

Zhu,

Guan

et al. 2024

ACS Sustainable Resour. Manage.

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Calcium carbide slag (CS) is an industrial solid waste produced via the coal-based poly(vinyl chloride) process, and its main component is calcium hydroxide (Ca(OH) 2 ) (85−95 wt %). CS can be used instead of calcium carbonate (CaCO 3 ) to produce calcium oxide (CaO), reducing carbon dioxide (CO 2 ) emissions. Our group has reported that CaO can be prepared at lower temperatures using CS compared with existing processing temperature, where the calcination temperature decreases from 1000 to 700 °C when CaCO 3 is replaced with CS during CaO production. A comparison of the carbon emissions of CS and CaCO 3 -based CaO preparation processes show that using CS to produce CaO reduces CO 2 emissions by 977.62 kg/t. Herein, the CS-based CaO is explained by controlling the CS calcination temperature and mineral transformation. CS completely decomposes into CaO at 492 °C. The calcination temperature of CS is between 400 and 600 °C, where CaCO 3 is formed via the reaction of carbon and Ca(OH) 2 and water in CS. Furthermore, when the carbon content in CS is >4%, CaCO 3 is formed. When the calcination temperature is 700 °C, CaCO 3 decomposes into CaO. As the temperature increases, the metallurgical activity of CS increases, and its strength decreases. When the temperature is 700 °C, the compressive strength of CaO is 21.94 MPa, its metallurgical activity is 379.85 mL, and the CaO content is 95.14%. This study provides a new method for preparing CaO to simultaneously reduce carbon emissions and in-situ recycle CS.

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Single step fabrication of spherical CaO pellets via novel agar-assisted moulding technique for high-temperature CO2 capture

Cited by 25 publications

References 73 publications

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

Controlled preparation of CaO adsorbents by microsyringe titration technology for CO₂ capture

An Innovative Approach to Prepare Calcium Oxide from Calcium Carbide Slag Based on Sequential Mineral Transformation

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Single step fabrication of spherical CaO pellets via novel agar-assisted moulding technique for high-temperature CO2 capture

Cited by 25 publications

References 73 publications

CO2 Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

CO2 Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

Controlled preparation of CaO adsorbents by microsyringe titration technology for CO2 capture

An Innovative Approach to Prepare Calcium Oxide from Calcium Carbide Slag Based on Sequential Mineral Transformation

Contact Info

Product

Resources

About

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

CO₂ Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

Controlled preparation of CaO adsorbents by microsyringe titration technology for CO₂ capture