Synthesis of macroporous Li 4 SiO 4 via a citric acid-based sol–gel route coupled with carbon coating and its CO 2 chemisorption properties

Wang, Ke; Yin, Zeguang; Zhao, Peng

doi:10.1016/j.ceramint.2015.10.083

Cited by 70 publications

(40 citation statements)

References 51 publications

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“…According to literature reports, Li 4 SiO 4 and Li 8 SiO 6 have different optimal calcination times for the complete reaction between silicon and lithium sources. 8,12,13,22,23,28 It was estimated that the optimal calcination time for Li 4 SiO 4 is ca. 2−4 h and the optimal calcination time for Li 8 SiO 6 is around 8 h. The Li-SBA15-4 sample was mainly composed of Li 4 SiO 4 with a tiny amount of Li 2 SiO 3 .…”

Section: Synthesis Of Lithium Silicates (Li-sba15-x)mentioning

confidence: 99%

“…Lee et al 11 fabricated a coral-like Li 4 SiO 4 by thermal conversion of a Li-and Si-containing metal−organic framework, and achieved a CO 2 uptake as high as 32.4 wt % at 550°C. Wang et al 12 designed a Li 4 SiO 4 coupled with carbon coating using a sol−gel process, and this material exhibited a high CO 2 capture capacity of 34.2 wt % (93% of theoretical sorption value). Subha et al 13 used colloidal silica as the silicon source, and the CO 2 capture capacity of the as-prepared Li 4 SiO 4 was further increased to 35.0 wt % (97% of theoretical sorption capacity).…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Lithium Silicates As Highly Efficient High-Temperature CO₂ Sorbents from SBA-15 Precursor

et al. 2017

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A series of lithium silicates with improved CO 2 sorption capacity were successfully synthesized using SBA-15 as the silicon precursor. The influence of Li/Si ratio, calcination temperature, and calcination duration on the chemical composition and CO 2 capture capacity of obtained lithium silicates was systematically investigated. The correlation between CO 2 sorption performance and crystalline phase abundance was determined using X-ray diffraction and a normalized reference intensity ratio method. Under the optimized condition, Li-SBA15-4 prepared using Li/Si = 4 that contains mainly Li 4 SiO 4 achieved an extremely high CO 2 capture capacity of 36.3 wt % (corresponding to 99% of the theoretical value of 36.7 wt % for Li 4 SiO 4 ), which is much higher than the Li 4 SiO 4 synthesized from conventional SiO 2 sources. It also showed very high cycling stability with only 1.0 wt % capacity loss after 15 cycles. Li-SBA15-10 (Li/Si = 10) that mainly contains Li 8 SiO 6 displayed an extremely high CO 2 uptake of 62.0 wt %, but its regeneration capacity was poor, with only 10.5 wt % of reversible CO 2 capture capacity. The influence of CO 2 concentration on the CO 2 capture performance of Li-SBA15-4 and Li-SBA15-10 samples was also studied. With the decrease in CO 2 concentration, relatively lower temperatures are needed for its maximum CO 2 capture capacity. The CO 2 sorption kinetics and mechanism for Li-SBA15-4 and Li-SBA15-10 samples were explored. Overall, we have shown that the lithium silicates synthesized from SBA-15 possessed much improved CO 2 sorption performance than that attained from conventional SiO 2 .

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Section: Synthesis Of Lithium Silicates (Li-sba15-x)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of Lithium Silicates As Highly Efficient High-Temperature CO₂ Sorbents from SBA-15 Precursor

et al. 2017

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“…86,[90][91][92][93] Wang et al 86 used rice husk ash as a silica precursor for Consequently, the sorbents had an increased area of contact to chemisorb CO2. Wang et al 95 employed carbon coating with sol-gel method to restrict particle growth and create a more porous structure during calcination. The material produced by sol-gel method is required to undergo calcination to obtain Li4SiO4 phase, like any other synthesis method.…”

Section: Li4sio4 394mentioning

confidence: 99%

Alkali Metal CO₂ Sorbents and the Resulting Metal Carbonates: Potential for Process Intensification of Sorption-Enhanced Steam Reforming

Memon

Zhao

Sikarwar

et al. 2016

Environ. Sci. Technol.

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“…Solid-state Li4SiO4 fabricated by traditional methods has an extremely low porosity and typically very large particle/grain size, making the reaction between Li4SiO4 and CO2 relatively slow [16]. To decrease particle sizes and increase its specific surface area, several synthetic routes, including ball milling [17,18], impregnated suspension [19][20][21], precipitation [22], sol-gel techniques [23][24][25], carbon templates or porous carbon [26][27][28] and hydration [29], have been suggested. Unfortunately, these morphologically-improved particles still exhibited unsatisfactory reaction kinetics (~10 -4 s -1 ) under typical hot flue gases in thermal power applications or under SE-SMR conditions [29,30].…”

Section: Introductionmentioning

confidence: 99%

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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Synthesis of macroporous Li 4 SiO 4 via a citric acid-based sol–gel route coupled with carbon coating and its CO 2 chemisorption properties

Cited by 70 publications

References 51 publications

Fabrication of Lithium Silicates As Highly Efficient High-Temperature CO₂ Sorbents from SBA-15 Precursor

Fabrication of Lithium Silicates As Highly Efficient High-Temperature CO₂ Sorbents from SBA-15 Precursor

Alkali Metal CO₂ Sorbents and the Resulting Metal Carbonates: Potential for Process Intensification of Sorption-Enhanced Steam Reforming

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

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Synthesis of macroporous Li 4 SiO 4 via a citric acid-based sol–gel route coupled with carbon coating and its CO 2 chemisorption properties

Cited by 70 publications

References 51 publications

Fabrication of Lithium Silicates As Highly Efficient High-Temperature CO2 Sorbents from SBA-15 Precursor

Fabrication of Lithium Silicates As Highly Efficient High-Temperature CO2 Sorbents from SBA-15 Precursor

Alkali Metal CO2 Sorbents and the Resulting Metal Carbonates: Potential for Process Intensification of Sorption-Enhanced Steam Reforming

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

Contact Info

Product

Resources

About

Fabrication of Lithium Silicates As Highly Efficient High-Temperature CO₂ Sorbents from SBA-15 Precursor

Fabrication of Lithium Silicates As Highly Efficient High-Temperature CO₂ Sorbents from SBA-15 Precursor

Alkali Metal CO₂ Sorbents and the Resulting Metal Carbonates: Potential for Process Intensification of Sorption-Enhanced Steam Reforming