Synthesis, kinetic study, and reaction mechanism of Li4SiO4 with CO2 in a slurry bubble column reactor

Kanai, Yugo; Terasaka, Koichi; Fujioka, Satoko

doi:10.1080/00986445.2019.1613229

Cited by 6 publications

(3 citation statements)

References 40 publications

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“…To understand the CO 2 adsorption process of various samples, adsorption curves in the 1st and 20th cycles are depicted and fitted using a double-exponential model, as shown in eq . , It is known that CO 2 chemisorption on lithium ceramics is a two-step process: the chemisorption between CO 2 and Li 4 SiO 4 directly occurring on the surface and the diffusion of Li + or CO 2 throughout the layer to reach the reaction surface . Here, y represents the weight percent of CO 2 adsorbed, t is the reaction time, and k 1 and k 2 are rate constants of Li 4 SiO 4 adsorption and diffusion processes, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…34,35 It is known that CO 2 chemisorption on lithium ceramics is a two-step process: the chemisorption between CO 2 and Li 4 SiO 4 directly occurring on the surface and the diffusion of Li + or CO 2 throughout the layer to reach the reaction surface. 36 Here, y represents the weight percent of CO 2 adsorbed, t is the reaction time, and k 1 and k 2 are rate constants of Li 4 SiO 4 adsorption and diffusion processes, respectively. A and B are the pre-exponential factors corresponding to the coefficients of the rate-limiting stages, and the constant C represents the maximal adsorption capacity of Li 4 SiO 4 .…”

Section: ■ Introductionmentioning

confidence: 99%

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Simplifying and Optimizing Li₄SiO₄ Preparation from Spent LiFePO₄ Batteries with Enhanced CO₂ Adsorption

Ruan,

Tong,

Ran

et al. 2023

ACS Sustainable Chem. Eng.

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A large amount of spent lithium batteries, especially lithium iron phosphate (LiFePO4), is discarded due to their limited lifespan and poses a great threat to the environment. At the same time, the potential application of Li4SiO4, an efficient high-temperature CO2 sorbent, is largely limited by the high cost of lithium resources. Thus, the preparation of Li4SiO4 from spent LiFePO4 batteries has great potential for achieving waste recycling and reducing CO2 capture costs. However, the process of recycling spent LiFePO4 batteries to synthesize Li4SiO4 sorbents still needs to be well investigated. This work proposes to simplify the preparation scheme by combing precipitation, Na doping, and synthesis processes and further optimizing the key variables of pH, Na2CO3 ratio, and heating rate. An optimal condition is determined to be pH = 9, Na2CO3 ratio = 11 wt %, and heating rate = 5 °C/min, and the sorbent prepared shows a superior stable CO2 capacity of 0.24 g/g in 80 adsorption/desorption cycles. The work develops an effective Li4SiO4 preparation scheme from spent LiFePO4 batteries with largely enhanced CO2 adsorption performance and reduced cost and could achieve a win–win situation in waste recycling and CO2 mitigation.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Simplifying and Optimizing Li₄SiO₄ Preparation from Spent LiFePO₄ Batteries with Enhanced CO₂ Adsorption

Ruan,

Tong,

Ran

et al. 2023

ACS Sustainable Chem. Eng.

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show abstract

“…Lithium orthosilicate (Li 4 SiO 4 ) has been considered to be one of the most promising candidates for high-temperature CO 2 adsorption and has attracted extensive research worldwide. − Compared with other high-temperature absorbents, Li 4 SiO 4 absorbents have a more economical preparation price, a simpler preparation method, a higher CO 2 adsorption capacity (the theoretical adsorption capacity was 36.7 wt %), and a lower regeneration temperature (<750 °C). − Silicon dioxide and lithium compounds are the main raw materials for the synthesis of Li 4 SiO 4. Researchers prefer to focus on inexpensive and plentiful silica sources than exploring lithium sources .…”

Section: Introductionmentioning

confidence: 99%

Confined Jet Impingement Continuous Microchannel Reactor Synthesis of Ultrahigh-Quality Mesoporous Silica Nanospheres for CO₂ Capture

Chen

et al. 2022

Ind. Eng. Chem. Res.

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Li 4 SiO 4 has been evaluated as one of the most promising CO 2 absorbers to mitigate climate changes caused by excessive CO 2 emissions. Li 4 SiO 4 absorbents with a high specific surface area would hold higher CO 2 capture capacity. However, with the lack of suitable SiO 2 precursors, the synthesis of Li 4 SiO 4 absorbents with a high specific surface area and a well-defined hollow sphere structure was still challenging. Here, a two-stream confined jet impingement continuous microchannel reactor was proposed to produce ultrahigh-quality mesoporous silica nanospheres (UHMSNs) with an ultrahigh specific surface area and a small particle size. The obtained UHMSNs possessed excellent water dispersibility, a uniform diameter (142−207 nm), tunable perpendicular mesopores (2.6−3.3 nm), a high surface area (1347∼1854 m 2 /g), and a large pore volume 0.86∼1.23 cm 3 /g). Moreover, MesoDyn simulation provided valuable information to optimize the nucleation stage and the crystallization stage of UHMSNs. Additionally, UHMSNs were used as the silicon source to synthesize the petal-like hollow structure of Li 4 SiO 4 microspheres, which enhanced CO 2 adsorption.

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Sol-gel derived, Na/K-doped Li4SiO4-based CO2 sorbents with fast kinetics at high temperature

Cui

Chen

et al. 2020

Chemical Engineering Journal

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Synthesis, kinetic study, and reaction mechanism of Li₄SiO₄ with CO₂ in a slurry bubble column reactor

Cited by 6 publications

References 40 publications

Simplifying and Optimizing Li₄SiO₄ Preparation from Spent LiFePO₄ Batteries with Enhanced CO₂ Adsorption

Simplifying and Optimizing Li₄SiO₄ Preparation from Spent LiFePO₄ Batteries with Enhanced CO₂ Adsorption

Confined Jet Impingement Continuous Microchannel Reactor Synthesis of Ultrahigh-Quality Mesoporous Silica Nanospheres for CO₂ Capture

Sol-gel derived, Na/K-doped Li4SiO4-based CO2 sorbents with fast kinetics at high temperature

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Synthesis, kinetic study, and reaction mechanism of Li4SiO4 with CO2 in a slurry bubble column reactor

Cited by 6 publications

References 40 publications

Simplifying and Optimizing Li4SiO4 Preparation from Spent LiFePO4 Batteries with Enhanced CO2 Adsorption

Simplifying and Optimizing Li4SiO4 Preparation from Spent LiFePO4 Batteries with Enhanced CO2 Adsorption

Confined Jet Impingement Continuous Microchannel Reactor Synthesis of Ultrahigh-Quality Mesoporous Silica Nanospheres for CO2 Capture

Sol-gel derived, Na/K-doped Li4SiO4-based CO2 sorbents with fast kinetics at high temperature

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Synthesis, kinetic study, and reaction mechanism of Li₄SiO₄ with CO₂ in a slurry bubble column reactor

Simplifying and Optimizing Li₄SiO₄ Preparation from Spent LiFePO₄ Batteries with Enhanced CO₂ Adsorption

Simplifying and Optimizing Li₄SiO₄ Preparation from Spent LiFePO₄ Batteries with Enhanced CO₂ Adsorption

Confined Jet Impingement Continuous Microchannel Reactor Synthesis of Ultrahigh-Quality Mesoporous Silica Nanospheres for CO₂ Capture