Influence of rheological behavior of molten sodium sulfate on adherent heterogeneous surface on performance of high-temperature thermochemical energy storage

Chen, Qicheng; Yang, Xupan; Li, Renwei; Dong, Nanhang; Zhang, Yingjin; Ding, Yulong

doi:10.1016/j.apsusc.2020.146530

Cited by 9 publications

(6 citation statements)

References 39 publications

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“…Meanwhile, the formation of a liquid skeleton structure will ingeniously separate the solid particles to prevent sintering. 51,52 It should be noticed that the promoting effect of the molten alkali metal salt depends on its wettability on the calcium oxide surface according to our conclusion. In terms of the complete calcium oxide surface, molten sodium sulfate shows good wettability at high temperatures, which is beneficial for changing the surface structure to enhance the diffusion capacity of carbon dioxide.…”

Section: ■ Introductionsupporting

confidence: 65%

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

et al. 2021

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The influence of the vacancy defect of the CaO surface on the wettability of molten alkali metal salt was studied by molecular dynamics simulations. The results indicated that in the temperature range of 800–1100 K, the molten Na2SO4 on both VDcalcium and VDoxygen defect surfaces presented a poor wettability compared to that on the complete surface. Measurement of the density profile and the contact angle of the molten Na2SO4 showed that the higher the temperature and defect concentration, the worse the wettability. The micromechanism was revealed by calculating the polarization intensity that the vacancy defect surface led to the formation of the induced dipole moment in the molten Na2SO4. Induced polarization caused by defect surfaces reduces the wettability of Na2SO4. More importantly, as the temperature and defect concentration increase, various defect surfaces form loose and local weak liquidity structures. These structures are beneficial for the diffusion of carbon dioxide into the solid, but the reduction in the spreading area caused by poor wettability causes the efficiency of the CaL to decline. The vibration difference between Na2SO4 and CaO increases with the increased temperature and defect concentration. This means that the thermal energy transportability at the interface is suppressed by poor wettability.

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Section: ■ Introductionsupporting

confidence: 65%

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

et al. 2021

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“…Here, molecular dynamic simulations may prove helpful to understand the rheological behavior and coverage of the molten salt promoter on the surface of MgO and MgCO 3 , respectively, under operating conditions. 470 Recently, in situ TEM was utilized to observe directly the growth of MgCO 3 at the triple phase boundary. 467 Although these results confirm that MgCO 3 can grow at the triple phase boundary, it does not prove the hypothesis that the triple phase boundary is the only reaction site as the interface was inaccessible for TEM because it is buried under the NaNO 3 promoter.…”

Section: Mgo-based Sorbentsmentioning

confidence: 99%

“…However, with an increasing degree of agglomeration of the promoter both the length of the triple phase boundary and the area of the interface between the promoter and MgO decrease, making it difficult to draw any conclusions about the prevailing carbonation mechanism from these experiments. Here, molecular dynamic simulations may prove helpful to understand the rheological behavior and coverage of the molten salt promoter on the surface of MgO and MgCO 3 , respectively, under operating conditions . Recently, in situ TEM was utilized to observe directly the growth of MgCO 3 at the triple phase boundary .…”

Section: Materials Optimizationmentioning

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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“…However, with an increasing degree of agglomeration of the promoter both the length of the triple phase boundary and the area of the interface between the promoter and MgO decrease, making it difficult to draw any conclusions about the prevailing carbonation mechanism from these experiments. Here, molecular dynamic simulations may prove helpful to understand the rheological behavior and coverage of the molten salt promoter on the surface of MgO and MgCO3, respectively, under operating conditions [438]. Recently, in situ TEM was utilized to observe directly the growth of MgCO3 at the triple phase boundary [435].…”

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

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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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Influence of rheological behavior of molten sodium sulfate on adherent heterogeneous surface on performance of high-temperature thermochemical energy storage

Cited by 9 publications

References 39 publications

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

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

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

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Influence of rheological behavior of molten sodium sulfate on adherent heterogeneous surface on performance of high-temperature thermochemical energy storage

Cited by 9 publications

References 39 publications

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

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

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

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Product

Resources

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