Understanding the CO2 chemical reaction path on Li6ZnO4, a new possible high temperature CO2 captor

Zhou, Xia; Plascencia-Hernández, Fernando; Ye, Feng; Pfeiffer, Heriberto

doi:10.1016/j.cej.2021.129205

Cited by 15 publications

(4 citation statements)

References 41 publications

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“…Li 2 ZrO 3 (theoretical CO 2 uptake capacity: 0.288 g CO 2 g sorbent –1 ) − and Li 4 SiO 4 (theoretical CO 2 uptake capacity: 0.367 g CO 2 g sorbent –1 ), − suffer from an intrinsically lower capacity because of the presence of tertiary elements in addition to slower kinetics of carbonation and regeneration; the same applies to the structurally similar Na 2 ZrO 3 (theoretical CO 2 uptake capacity: 0.234 g CO 2 g sorbent –1 ) (see section ). , One approach to overcome this limitation is to synthesize materials with a higher fraction of alkali metals, such as Li 6 ZnO 4 , Li 6 CoO 4 , Li 5 SbO 5 , Li 4 WO 5 , Li 6 WO 6 , , LiYO 2 , Li 6 Si 2 O 7 , Li 8 SiO 6 , , Li 6 Zr 2 O 7 , , Li 8 ZrO 6 , − Li 5 AlO 4 , , and Li 5 FeO 4 . , Thermogravimetric studies have shown that these materials generally have relatively high gravimetric CO 2 uptake capacities and in many cases also a high cyclic stability, at least for the small number of cycles tested. An overview of these materials is shown in Table .…”

Section: Other Solid Oxide-based 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: Other Solid Oxide-based 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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“…In other words, it has been demonstrated that this parameter has a direct correlation with the alkaline ion intracrystalline diffusion. For instance, in Li 6 CoO 4 and Li 6 ZnO 4 ceramic materials, their triangle gap areas are 4.9 and 4.38 Å 2 , respectively. , This area allows lithium diffusion through the ceramic, considering the Li 1+ ionic radio of 0.59 Å. In the sodium ferrite (NaFeO 2 ) case, a triangle gap area of 5.8 Å 2 is presented .…”

Section: Resultsmentioning

confidence: 99%

“…Within this context, several materials have been proposed as solid sorbents, among them, alkali-based ceramics stand out. In fact, one of the most studied ceramics is lithium orthosilicate (Li 4 SiO 4 ) because of its high CO 2 capture capacity between 400 and 700 °C, its fast adsorption/desorption kinetics, and its outstanding cyclic stability. − Furthermore, other lithium-based sorbents have been studied deeply, as Li 2 CuO 2 , , Li 6 CoO 4 , or Li 6 ZnO 4 , among others. However, lithium costs, its limited availability and its use in other applications, such as Li-ion batteries, may not be ideal conditions for its possible application within this context.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Ortho and Pyrosilicates (Na₄SiO₄–Na₆Si₂O₇) Mixture during the CO₂ Chemical Capture Performance

Plascencia-Hernández

Araiza

Pfeiffer

2022

Ind. Eng. Chem. Res.

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A novel CO2 sorbent composed of sodium orthosilicate (Na4SiO4), sodium pyrosilicate (Na6Si2O7), and sodium carbonate (Na2CO3) was successfully synthesized through the solid-state method. This sorbent was evaluated as CO2 captor (theoretical capture capacity of 4.08 mmol of CO2 per gram of material) under CO2-saturated and partial pressure conditions, using dynamic and isothermal approaches. Results evidenced that the sorbent was sensitive to the CO2 partial pressure, although significant CO2 capture efficiencies were observed between 100 and 830 °C, at any CO2 partial pressure. The characterization of the isothermal products showed a complex CO2 chemisorption process, where sodium metasilicate (Na2SiO3), produced as the secondary phase, participated in the CO2 capture in the low temperature range, while the initial presence and in situ generation of Na6Si2O7 played an important role during the whole process. The positive effect of Na6Si2O7 was confirmed through the synthesis and evaluation of a pyrosilicate-based sorbent. Kinetic analysis was performed showing comparable and favorable results in comparison to previous studies using alkaline ceramics for CO2 capture. Furthermore, the sorbent was able to cycle 10 times, at least, maintaining an efficiency of ∼70%. Hence, the combination of Na4SiO4–Na6Si2O7 leads to high CO2 capture in a wide temperature range.

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“…Up to date, high-temperature (>400°C) CO 2 captors mainly include hydrotalcite compounds, [11][12][13] alkali metal oxides, [14][15][16] sodium-based materials, 17,18 and lithium-based ceramic materials, [19][20][21][22] and so on. Lithium-based ceramic materials have sparked much interest among researchers over the past two decades, 23 such as Li 4 SiO 4 , Li 5 AlO 4 , Li 5 FeO 4 , Li 6 CoO 4 , Li 2 CuO 2 , Li 2 ZrO 3 , and so on.…”

Section: Wan Et Almentioning

confidence: 99%

Enhanced carbon dioxide capture performance of natural mineral vermiculite‐derived lithium silicate with Na doping

et al. 2022

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Natural clay mineral-derived functional materials have attracted considerable attention worldwide. Herein, natural mineral vermiculite (VMT)-derived lithium silicate (VMT-based Li 4 SiO 4 ) materials with different molar ratios of Na to Si were prepared for the high-temperature CO 2 capture. Among developed adsorbents, the VMT-Li 4 SiO 4 -2Na materials displayed superior CO 2 adsorption ability with 0.28 g/g adsorbent adsorption rate after 5 min and 33.67 wt% capture capacity at 650°C. The experimental investigations uncovered the presence of Li 3 NaSiO 4 or/and eutectic Li 2 CO 3 -Na 2 CO 3 molten salt resulting from the introduction of Na 2 CO 3 , which resulted in higher CO 2 uptake. Furthermore, the cyclic carbonation-decarbonation experiment of VMT-Li 4 SiO 4 -2Na showed better stability when the O 2 was used to perform the decarbonation step. We believe that the Na modified-VMT-based Li 4 SiO 4 adsorbent shows potential for practical applications in peak carbon dioxide emissions and carbon neutralization.

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Understanding the CO2 chemical reaction path on Li6ZnO4, a new possible high temperature CO2 captor

Cited by 15 publications

References 41 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

Effect of Sodium Ortho and Pyrosilicates (Na₄SiO₄–Na₆Si₂O₇) Mixture during the CO₂ Chemical Capture Performance

Enhanced carbon dioxide capture performance of natural mineral vermiculite‐derived lithium silicate with Na doping

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Understanding the CO2 chemical reaction path on Li6ZnO4, a new possible high temperature CO2 captor

Cited by 15 publications

References 41 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

Effect of Sodium Ortho and Pyrosilicates (Na4SiO4–Na6Si2O7) Mixture during the CO2 Chemical Capture Performance

Enhanced carbon dioxide capture performance of natural mineral vermiculite‐derived lithium silicate with Na doping

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

Effect of Sodium Ortho and Pyrosilicates (Na₄SiO₄–Na₆Si₂O₇) Mixture during the CO₂ Chemical Capture Performance