Metal-oxide stabilized CaO/CuO composites for the integrated Ca/Cu looping process

Chen, Jian; Donat, Felix; Duan, Lunbo; Kierzkowska, Agnieszka M.; Kim, Sung M.; Xu, Yongqing; Anthony, Edward J.; Müller, Christoph R.

doi:10.1016/j.cej.2020.126330

Cited by 35 publications

(15 citation statements)

References 51 publications

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“…The carbonation reaction proceeds at a slower rate than in the other three cases because of diffusion limitations and CO 2 moving through a network of narrow pores but reaches near completion within a reasonable time. 135 Lastly, Figure 3d shows a case which is most frequently observed with natural CaO-based sorbents. 112,136 A reasonably large amount of CaO is accessible for CO 2 under kinetic control, followed by a gradual decrease in the observed rate of carbonation because of increasing diffusional transport resistance within the pore network.…”

Section: Thermodynamic Properties Of Alkali Metal Oxide Sorbentsmentioning

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: Thermodynamic Properties Of Alkali Metal Oxide Sorbentsmentioning

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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“…The most expensive part of the CCS steps CO 2 capture, transport, and storage, is the capture part, and substantial efforts have been devoted to developing effective and economically feasible CO 2 capture technologies. − Among these, CO 2 capture using MgO-based sorbents via a reversible carbonation/calcination reaction (MgO + CO 2 ↔ MgCO 3 ) at intermediate temperatures (300–500 °C) has gained increased interest recently. , MgO-based sorbents exhibit promising prospects due to their wide availability, low cost, nontoxicity, and high theoretical CO 2 uptake capacity (∼1.1 g of CO 2 per g of MgO). CO 2 captured by MgO-based sorbents can be released at relatively low temperatures in a less endothermic reaction compared to other solid sorbents that are commonly used, such as CaO-based sorbents; the calcination temperatures range from ∼400–500 °C for MgO-based sorbents compared to 850–950 °C for CaO-based sorbents. − However, using bulk MgO as the sorbent for CO 2 capture is challenging owing to its poor sorption kinetics, resulting in a fairly low effective CO 2 uptake capacity (∼ less than 0.01 g CO 2 /g sorbent after 60 min at 400 °C in pure CO 2 ) that limits its potential use in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Effect of Process Conditions and Material Characteristics of Alkali Metal Salt Promoted MgO-Based Sorbents on Their CO₂ Capture Performance

Chen

Duan

Donat

2021

ACS Sustainable Chem. Eng.

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CO 2 capture using alkali metal salt (AMS)-promoted MgO-based sorbents at intermediate temperatures (300−500 °C) has gained increased interest recently. The prospects of such materials for CO 2 capture were assessed in this work. We investigated the most reactive MgO-based sorbents that have been reported in the literature (i.e., MgO promoted with a combination of various AMS (including NaNO 3 , LiNO 3 , K 2 CO 3 , and Na 2 CO 3 )), and examined how particle size (from powder to pelletized 500 μm particles) and reaction conditions (calcination/carbonation temperature and partial pressure of CO 2 ) affect the cyclic CO 2 uptake using a thermogravimetric analyzer (TGA) at ambient pressure. The TGA results showed that the CO 2 uptake performance of the sorbents decreased significantly after pelletization, losing 74% of its initial capacity. However, the CO 2 uptake capacity of the pelletized sorbents continued to increase over 100 cycles and reached a value (∼0.46 g CO 2 /g sorbent ) close to that of the powdery sample (∼0.53 g CO 2 /g sorbent ). Analysis via X-ray diffraction (XRD), inductively coupled plasma optical emission spectroscopy (ICP-OES), scanning electron microscope (SEM), N 2 physisorption, and in situ XRD suggests that the increase in CO 2 uptake was related to a change of the nature of the alkali species within the molten phase that is reflected by their recrystallization behavior when cooling them down to room temperature, and appeared to be affected by the CO 2 partial pressure present during carbonation. Finally, the CO 2 capture performance of the best-performing sorbents was evaluated in a packed bed reactor, in order to assess whether the most reactive sorbents are capable of removing a significant amount of CO 2 from a gas stream at ambient pressure. The CO 2 uptake of the sorbents in the packed bed experiments was very close to that in the TGA experiments; however, the CO 2 capture efficiency was less than 10%, which currently appears too low for an industrial postcombustion CO 2 capture process to be viable. New material developments should not only focus on improving the rate of formation of MgCO 3 from MgO but also assess whether CO 2 removal with such sorbents is actually feasible. KEYWORDS: CO 2 capture, MgO-based sorbents, Alkali metal salt, CO 2 partial pressure, CO 2 capture efficiency

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“…Figure 2c shows a case where only a small fraction of CaO is converted under kinetic control. The carbonation reaction proceeds at a slower rate than in the other three cases due to diffusion limitations and CO2 moving through a network of narrow pores, but reaches near completion within a reasonable time [122]. Lastly, Figure 2d shows a case which is most frequently observed with natural CaO-based sorbents [99], [123].…”

Section: Cao-caco3 Systemmentioning

confidence: 93%

“…Subsequently, the calcium cobalt oxide phase is regenerated under oxidizing conditions while releasing CO2. Calcium copper oxide is present in CaO/CuO composites that have been investigated for schemes to reduce the energy requirements for sorbent regeneration of the conventional calcium looping process [122], [397]. Here, the exothermic reduction of CuO with a reducing gas such as CH4 is used to provide the heat required for the regeneration of CaCO3 in the same particle.…”

Section: Mgo and Nano3 Interface) This Hypothesis Was Supported Expementioning

confidence: 99%

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Dunstan¹,

Donat²,

Bork³

et al. 2021

Preprint

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Carbon dioxide capture and mitigation forms 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, 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 mid- 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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Metal-oxide stabilized CaO/CuO composites for the integrated Ca/Cu looping process

Cited by 35 publications

References 51 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

Assessment of the Effect of Process Conditions and Material Characteristics of Alkali Metal Salt Promoted MgO-Based Sorbents on Their CO₂ Capture Performance

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

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Metal-oxide stabilized CaO/CuO composites for the integrated Ca/Cu looping process

Cited by 35 publications

References 51 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

Assessment of the Effect of Process Conditions and Material Characteristics of Alkali Metal Salt Promoted MgO-Based Sorbents on Their CO2 Capture Performance

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

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Product

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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

Assessment of the Effect of Process Conditions and Material Characteristics of Alkali Metal Salt Promoted MgO-Based Sorbents on Their CO₂ Capture Performance