Molten sodium-fluoride-promoted high-performance Li4SiO4-based CO2 sorbents at low CO2 concentrations

Wang, Ke; Zhou, Zhongyun; Zhao, Peng; Yin, Zeguang; Su, Zhen; Ji, Sun

doi:10.1016/j.apenergy.2017.07.072

Cited by 58 publications

(18 citation statements)

References 64 publications

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“…6 and the activation enthalpies were obtained from the slope. Compared with pure Li4SiO4 reported in previous studies [40,54], the ∆H ++ values of the surface chemisorption processes for SCT-NaCl-0.1 and SCT-NaBr-0.1 were greatly reduced, indicating the surface chemisorption process was less dependent on temperature when doping with NaCl/NaBr. Moreover, a decrease in the ∆H ++ value of NaBr doping for surface chemisorption was observed as compared with the case of NaCl doping, indicating that its surface chemisorption was less reliant on temperature.…”

Section: Co2 Uptake Characteristics and Kinetic Analysiscontrasting

confidence: 62%

“…Subha et al [39] fabricated a nanorod (Li−Na−K)CO3-coated Li4SiO4 material by a microwave sol-gel process. Recently, Wang et al [40,41] developed a novel anionic (F or Cl) doping technique to modify the intrinsic properties of Li4SiO4 through a sacrificial carbon template and hydration techniques. Both NaF-and NaCl-doped Li4SiO4 showed superior CO2 absorption performance.…”

Section: Introductionmentioning

confidence: 99%

“…Both NaF-and NaCl-doped Li4SiO4 showed superior CO2 absorption performance. It appears that in the high-temperature absorption process, anionic (CO3, F and Cl) doping forming low-temperature eutectic compounds which significantly reduced the diffusion resistance of CO2 [29,40,42]. However, the anionic doping also suffered from serious sintering problems, inducing severe grain aggregation and porosity loss, which resulted in poorer kinetic performance.…”

Section: Introductionmentioning

confidence: 99%

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Sorption of CO2 on NaBr co-doped Li4SiO4 ceramics: Structural and kinetic analysis

Wang

Zhao

Clough

et al. 2019

Fuel Processing Technology

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Structurally modified and improved NaBr co-doped Li4SiO4 ceramics were developed for CO2 absorption in low-CO2-concentration atmospheres. Pure and NaCldoped Li4SiO4 ceramics were also prepared for comparison. The samples were analyzed by X-ray diffraction, Scanning Electron Microscopy, N2 adsorption, X-ray photoelectron spectroscopy, differential scanning calorimetry, and thermogravimetric analyses (dynamic and isothermal). The sorption kinetics were obtained using a double exponential model. The results showed that both Na and Br can be introduced into the Li4SiO4 structure and doped on Li and oxygen sites, respectively. The doped sample presented a Li2O-enriched surface, guaranteeing abundant Li-O sites and our significantly different from previous anionic (CO3, F and Cl) doping of Li4SiO4, Br doping also generated macroporous features with small particle size. These favorable characteristics promoted the surface chemisorption kinetics. Moreover, DSC analysis confirmed the formation of the molten phases during CO2 absorption, which helps improve the lithium diffusion kinetics. Here, 0.1 mol NaBr doping was used to reach a maximum absorption capacity (>30.0 wt.%) in 15 vol.% CO2, suggesting that NaBrdoped Li4SiO4 ceramics have great potential for CO2 capture at high temperature.

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Section: Co2 Uptake Characteristics and Kinetic Analysiscontrasting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sorption of CO2 on NaBr co-doped Li4SiO4 ceramics: Structural and kinetic analysis

Wang

Zhao

Clough

et al. 2019

Fuel Processing Technology

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“…The doping of alkali metals, such as Na and K, could produce a layer of molten salts with low eutectic temperature, which reduced diffusion resistance effectively, thus the limiting step of Li 4 SiO 4 material for CO 2 absorption could be resolved. The CO 2 absorption performance of various alkali metal-doped Li 4 SiO 4 materials is summarized in Table 2 [39,40,41,42,43,44,45,46].…”

Section: Synthesis Of Li4sio4 Materials With Superior Cyclic Absormentioning

confidence: 99%

Performance of Li4SiO4 Material for CO2 Capture: A Review

Yan

et al. 2019

IJMS

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Lithium silicate (Li4SiO4) material can be applied for CO2 capture in energy production processes, such as hydrogen plants, based on sorption-enhanced reforming and fossil fuel-fired power plants, which has attracted research interests of many researchers. However, CO2 absorption performance of Li4SiO4 material prepared by the traditional solid-state reaction method is unsatisfactory during the absorption/regeneration cycles. Improving CO2 absorption capacity and cyclic stability of Li4SiO4 material is a research highlight during the energy production processes. The state-of-the-art kinetic and quantum mechanical studies on the preparation and CO2 absorption process of Li4SiO4 material are summarized, and the recent studies on the effects of preparation methods, dopants, and operating conditions on CO2 absorption performance of Li4SiO4 material are reviewed. Additionally, potential research thoughts and trends are also suggested.

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“…However, the operating costs related to CCS using amine‐based sorbents are prohibitively high, primarily due to the additional steps required to cool the high‐temperature flue gases . In contrast, high‐temperature solid sorbents, including hydrotalcite‐like materials , calcium oxides , and alkali ceramics , can separate CO 2 directly from hot flue gases and the sorption‐enhanced steam methane reforming (SESMR) process, thereby eliminating the cooling process and significantly decreasing the operating costs. Among these sorbents, alkali ceramics are considered as attractive CO 2 captors.…”

Section: Introductionmentioning

confidence: 99%

Understanding the flue gas components on the mechanism governing CO₂ adsorption on the Li₄SiO₄ surface

Wang

Zhao

2018

Env Prog and Sustain Energy

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The development of novel Li4SiO4‐based sorbents is hampered by a lack of understanding of the mechanisms governing CO2 adsorption on the Li4SiO4 surface. In this work, the adsorption of CO2 and flue gas components (such as H2O and SOX (SO2 and SO3)) on a simulated Li4SiO4 surface was investigated using ab initio‐based energetic calculations. The Li4SiO4 surface was modeled by a cluster of lithium silicate, in which the atoms were unsaturated to simulate the active sites. Furthermore, Fourier transform infrared (FTIR) spectra were also analyzed. The calculated results showed that three possible configurations were determined: CO2 weakly sorbed on the oxygen sites of Li4SiO4 through physisorption; a carbonate species appeared, which was characterized by chemisorption; and a linear cluster of Li+‐O = C=O formed, having the largest sorption energy. These three possible pathways were likewise in accordance with the FTIR results. Moreover, a pre‐chemisorption of water on Li4SiO4 resulted in promoted CO2 capture, while the presence of competitive SOX sorption on the same active sites as CO2 sorption showed an inhibition effect. The results clarify the complex adsorption mechanisms on the Li4SiO4 surface. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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Molten sodium-fluoride-promoted high-performance Li4SiO4-based CO2 sorbents at low CO2 concentrations

Cited by 58 publications

References 64 publications

Sorption of CO2 on NaBr co-doped Li4SiO4 ceramics: Structural and kinetic analysis

Sorption of CO2 on NaBr co-doped Li4SiO4 ceramics: Structural and kinetic analysis

Performance of Li4SiO4 Material for CO2 Capture: A Review

Understanding the flue gas components on the mechanism governing CO₂ adsorption on the Li₄SiO₄ surface

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Molten sodium-fluoride-promoted high-performance Li4SiO4-based CO2 sorbents at low CO2 concentrations

Cited by 58 publications

References 64 publications

Sorption of CO2 on NaBr co-doped Li4SiO4 ceramics: Structural and kinetic analysis

Sorption of CO2 on NaBr co-doped Li4SiO4 ceramics: Structural and kinetic analysis

Performance of Li4SiO4 Material for CO2 Capture: A Review

Understanding the flue gas components on the mechanism governing CO2 adsorption on the Li4SiO4 surface

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Understanding the flue gas components on the mechanism governing CO₂ adsorption on the Li₄SiO₄ surface