Towards understanding the thermoanalysis of water sorption on lithium orthosilicate (Li4SiO4)

Ortíz-Landeros, José; Martínez‐dlCruz, Lorena; Gómez-Yáñez, Carlos; Pfeiffer, Heriberto

doi:10.1016/j.tca.2010.12.025

Cited by 47 publications

(21 citation statements)

References 25 publications

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“…However, at 500-6008C, unequal intensities appear at 426, 630, and 956 cm 21 , which are attributed to SiO 22 3 vibrations [44,45]. The features at 736 and 860 cm 21 and the double-shoulder at 1435 and 1483 cm 21 are attributed to Li 2 CO 3 vibrations [46], which is in accordance with CC2 in Figure 2f. The bands at 1080 and 1795 cm 21 are identified as C-O and C 5 O vibrations, respectively, corresponding to a horizontal sorption cluster [47,48].…”

Section: Ftir Analysissupporting

confidence: 75%

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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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Section: Ftir Analysissupporting

confidence: 75%

“…Meanwhile, the calculated results are also in agreement with those reported by Ortiz‐Landeroset et al . , showing that two different sorption mechanisms (physical adsorption and chemical adsorption) occurred for H 2 O on Li 4 SiO 4.…”

Section: Resultsmentioning

confidence: 98%

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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“…1 3) and (4), respectively, LiOH and Li 2 SiO 3 are products from the reaction of Li 4 SiO 4 with steam and Li 2 CO 3 and SiO 2 are products from the reaction of Li 4 SiO 4 with CO 2 . Both reactions can slowly occur at room temperature [10,32].…”

Section: Characterizationmentioning

confidence: 99%

Lithium orthosilicate for CO2 capture with high regeneration capacity: Kinetic study and modeling of carbonation and decarbonation reactions

Amorim

Domenico

Dantas

et al. 2016

Chemical Engineering Journal

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“…Figures 6 and 7 (9) Figure 6A shows the calculated heat of reactions (ΔH) involved in the hydroxylation process of the lithium silicates, and it is evident that the Li 8 SiO 6 and Li 4 SiO 4 hydroxylations are exothermic reactions, whereas the Li 2 SiO 3 process is endothermic. Additionally, the ΔG values ( Figure 6B) 67 Moreover, Figure 7 shows the graphs describing where the Gibbs free energy change is equal to zero at a given P On the other hand, in a previous paper, 23 the ΔH and ΔG values involved in the carbonation process of these lithium silicates were investigated. According to this study and the data shown above, in the 30−100°C range, the Li 8 SiO 6 , Li 4 SiO 4 , and Li 2 SiO 3 carbonation and hydroxylation energy values varied significantly (Table 1).…”

Section: ■ Resultsmentioning

confidence: 97%

“…67 On the basis of reaction 6, a total reaction conversion should correspond to a 20% weight increment. In the relative humidity curves (see Figure 2) the final weight increments were between 5 and 12.5 wt %, which correspond to 25% and 62.5% efficiency, not considering the possible presence of adsorbed water.…”

Section: ■ Resultsmentioning

confidence: 99%

Analysis of the CO₂–H₂O Chemisorption in Lithium Silicates at Low Temperatures (30–80 °C)

Alcántar-Vázquez

Herrera

González

et al. 2015

Ind. Eng. Chem. Res.

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Li 8 SiO 6 and Li 4 SiO 4 were synthesized by a solid-state reaction. Then, dynamic and isothermal thermogravimetric water vapor sorption experiments were performed using two carrier gases: N 2 and CO 2 . Initially, the Li 8 SiO 6 −H 2 O−(N 2 or CO 2 ) systems were analyzed. It was evidenced that Li 8 SiO 6 can trap water physically and chemically, producing Li−OH superficial species. When CO 2 was used as the carrier gas, Li 8 SiO 6 continued chemisorbing H 2 O but CO 2 was trapped as well, forming Li 2 CO 3 and Li 4 SiO 4 as secondary phases. On the basis of these results, the Li 4 SiO 4 −H 2 O−CO 2 system was also analyzed. The experimental results and different theoretical thermodynamic calculations confirmed that Li 8 SiO 6 can chemisorb 2 moles of CO 2 per mole of ceramic at a low temperature range (30−80°C). Finally, different CO 2 chemisorption kinetic experiments were performed to analyze and quantify the trapped CO 2 .

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Towards understanding the thermoanalysis of water sorption on lithium orthosilicate (Li4SiO4)

Cited by 47 publications

References 25 publications

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

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

Lithium orthosilicate for CO2 capture with high regeneration capacity: Kinetic study and modeling of carbonation and decarbonation reactions

Analysis of the CO₂–H₂O Chemisorption in Lithium Silicates at Low Temperatures (30–80 °C)

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Towards understanding the thermoanalysis of water sorption on lithium orthosilicate (Li4SiO4)

Cited by 47 publications

References 25 publications

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

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

Lithium orthosilicate for CO2 capture with high regeneration capacity: Kinetic study and modeling of carbonation and decarbonation reactions

Analysis of the CO2–H2O Chemisorption in Lithium Silicates at Low Temperatures (30–80 °C)

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Resources

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

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

Analysis of the CO₂–H₂O Chemisorption in Lithium Silicates at Low Temperatures (30–80 °C)