Kinetic study and modeling on the regeneration of Li4SiO4-based sorbents for high-temperature CO2 capture

Shuzhen Chen; Changlei Qin; Weiyang Yuan; Dawid P. Hanak; Jingyu Ran

doi:10.1016/j.fuproc.2021.106976

Kinetic study and modeling on the regeneration of Li₄SiO₄-based sorbents for high-temperature CO₂ capture

Shuzhen Chen, Changlei Qin, Weiyang Yuan, Dawid P. Hanak, Jingyu Ran

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Li₄SiO₄ is acknowledged as a promising sorbent candidate in high-temperature CO₂ adsorption. However, reaction kinetics for the regeneration process of Li₄SiO₄, especially its dependence on CO₂ pressure is lack of understanding. This work designed and carried out a series of isothermal tests on the regeneration of pure Li₄SiO₄ and K-Li₄SiO₄ under CO₂ partial pressure of 0–0.5 atm and temperature of 625–725 °C. For the first time, the expression of (P_eq − P_CO2)ⁿ is introduced into the regeneration rate equation so as to reveal its dependence on CO₂ pressure. The reaction order (n) is found to grade according to the value of (P_eq − P_CO2), and the apparent activation energy is calculated as 284.42 kJ•mol⁻¹ and 146.31 kJ•mol⁻¹ for the regeneration of Li₄SiO₄ and K-Li₄SiO₄, respectively. Furthermore, this work proposes that power law model with m = 4/3 is the most probable mechanism function for the regeneration of Li₄SiO₄-based sorbents.

Original language	English
Article number	106976
Journal	Fuel Processing Technology
Volume	222
DOIs	https://doi.org/10.1016/j.fuproc.2021.106976
Publication status	Published - 30 Nov 2021
Externally published	Yes

Bibliographical note

Funding Information:
The authors are grateful for financial support from National Natural Science Foundation of China (No. 52076020 ), the Fundamental Research Funds for the Central Universities (No. 2020CDJQY-A050 ), and Venture and Innovation Support Program for Chongqing Overseas Returnees (No. cx2017021 ).

Publisher Copyright:
© 2021 Elsevier B.V.

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title = "Kinetic study and modeling on the regeneration of Li4SiO4-based sorbents for high-temperature CO2 capture",

abstract = "Li4SiO4 is acknowledged as a promising sorbent candidate in high-temperature CO2 adsorption. However, reaction kinetics for the regeneration process of Li4SiO4, especially its dependence on CO2 pressure is lack of understanding. This work designed and carried out a series of isothermal tests on the regeneration of pure Li4SiO4 and K-Li4SiO4 under CO2 partial pressure of 0–0.5 atm and temperature of 625–725 °C. For the first time, the expression of (Peq − PCO2)n is introduced into the regeneration rate equation so as to reveal its dependence on CO2 pressure. The reaction order (n) is found to grade according to the value of (Peq − PCO2), and the apparent activation energy is calculated as 284.42 kJ•mol−1 and 146.31 kJ•mol−1 for the regeneration of Li4SiO4 and K-Li4SiO4, respectively. Furthermore, this work proposes that power law model with m = 4/3 is the most probable mechanism function for the regeneration of Li4SiO4-based sorbents.",

author = "Shuzhen Chen and Changlei Qin and Weiyang Yuan and Hanak, {Dawid P.} and Jingyu Ran",

note = "Funding Information: The authors are grateful for financial support from National Natural Science Foundation of China (No. 52076020 ), the Fundamental Research Funds for the Central Universities (No. 2020CDJQY-A050 ), and Venture and Innovation Support Program for Chongqing Overseas Returnees (No. cx2017021 ). Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

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doi = "10.1016/j.fuproc.2021.106976",

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T1 - Kinetic study and modeling on the regeneration of Li4SiO4-based sorbents for high-temperature CO2 capture

AU - Chen, Shuzhen

AU - Qin, Changlei

AU - Yuan, Weiyang

AU - Hanak, Dawid P.

AU - Ran, Jingyu

N1 - Funding Information: The authors are grateful for financial support from National Natural Science Foundation of China (No. 52076020 ), the Fundamental Research Funds for the Central Universities (No. 2020CDJQY-A050 ), and Venture and Innovation Support Program for Chongqing Overseas Returnees (No. cx2017021 ). Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/11/30

Y1 - 2021/11/30

N2 - Li4SiO4 is acknowledged as a promising sorbent candidate in high-temperature CO2 adsorption. However, reaction kinetics for the regeneration process of Li4SiO4, especially its dependence on CO2 pressure is lack of understanding. This work designed and carried out a series of isothermal tests on the regeneration of pure Li4SiO4 and K-Li4SiO4 under CO2 partial pressure of 0–0.5 atm and temperature of 625–725 °C. For the first time, the expression of (Peq − PCO2)n is introduced into the regeneration rate equation so as to reveal its dependence on CO2 pressure. The reaction order (n) is found to grade according to the value of (Peq − PCO2), and the apparent activation energy is calculated as 284.42 kJ•mol−1 and 146.31 kJ•mol−1 for the regeneration of Li4SiO4 and K-Li4SiO4, respectively. Furthermore, this work proposes that power law model with m = 4/3 is the most probable mechanism function for the regeneration of Li4SiO4-based sorbents.

AB - Li4SiO4 is acknowledged as a promising sorbent candidate in high-temperature CO2 adsorption. However, reaction kinetics for the regeneration process of Li4SiO4, especially its dependence on CO2 pressure is lack of understanding. This work designed and carried out a series of isothermal tests on the regeneration of pure Li4SiO4 and K-Li4SiO4 under CO2 partial pressure of 0–0.5 atm and temperature of 625–725 °C. For the first time, the expression of (Peq − PCO2)n is introduced into the regeneration rate equation so as to reveal its dependence on CO2 pressure. The reaction order (n) is found to grade according to the value of (Peq − PCO2), and the apparent activation energy is calculated as 284.42 kJ•mol−1 and 146.31 kJ•mol−1 for the regeneration of Li4SiO4 and K-Li4SiO4, respectively. Furthermore, this work proposes that power law model with m = 4/3 is the most probable mechanism function for the regeneration of Li4SiO4-based sorbents.

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Kinetic study and modeling on the regeneration of Li₄SiO₄-based sorbents for high-temperature CO₂ capture

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