Fundamentals in CO2 capture of Na2CO3 under a moist condition

doi:10.1016/j.jechem.2017.08.005

能源化学(英文) ›› 2017, Vol. 26 ›› Issue (5): 972-983.DOI: 10.1016/j.jechem.2017.08.005

Fundamentals in CO₂ capture of Na₂CO₃ under a moist condition

Hongchao Luo, Hirofumi Kanoh

Graduate School of Science, Chiba University, 1-33 Yayoi-Cho, Inage-Ku, Chiba, Japan

收稿日期:2017-05-29 修回日期:2017-08-04 出版日期:2017-09-15 发布日期:2017-11-10
通讯作者: Hirofumi Kanoh,E-mail address:kanoh@faculty.chiba-u.jp
基金资助:
We thank the Center for Analytical Instrumentation, Chiba University for its help to the SEM measurement. This work was supported by a Grant-in-Aid for Scientific Research (C) (Grant No. 15K05583) from the Japan Society for the Promotion of Science.

Fundamentals in CO₂ capture of Na₂CO₃ under a moist condition

Hongchao Luo, Hirofumi Kanoh

Graduate School of Science, Chiba University, 1-33 Yayoi-Cho, Inage-Ku, Chiba, Japan

Received:2017-05-29 Revised:2017-08-04 Online:2017-09-15 Published:2017-11-10
Contact: Hirofumi Kanoh,E-mail address:kanoh@faculty.chiba-u.jp
Supported by:
We thank the Center for Analytical Instrumentation, Chiba University for its help to the SEM measurement. This work was supported by a Grant-in-Aid for Scientific Research (C) (Grant No. 15K05583) from the Japan Society for the Promotion of Science.

摘要/Abstract

摘要： Capacity and kinetics of CO₂ capture of Na₂CO₃ were studied to determine the mechanism for CO₂ sequestration under ambient conditions. Bicarbonate formation of Na₂CO₃ was examined by a thermogravimetric analysis (TGA) under various CO₂ and water vapor concentrations and the accompanying structural changes of Na₂CO₃ were demonstrated by X-ray diffraction (XRD). Morphological variations were observed during the reaction of CO₂ capture through scanning electron microscope (SEM). Structural changes and morphological variations, which occurred during the course of the reaction, were then connected to the kinetic and exothermic properties of the CO₂ capture process from the XRD and SEM measurements. The results showed that the bicarbonate formation of Na₂CO₃ has two different pathways. For higher CO₂ and H₂O concentrations, the bicarbonate formation proceeded effectively. However, for lower CO₂ and H₂O concentrations, the reactions were more complicated. The formation of Na₂CO₃·H₂O from Na₂CO₃ as the first step, followed by the subsequent formation of Na₅H₃(CO₃)₄, and then the bicarbonate formation proceeds. To understand such fundamental properties in CO₂ capture of Na₂CO₃ is very important for utilization of Na₂CO₃ as a sorbent for CO₂ capture.

关键词: CO₂ capture, Sodium carbonate, Moist condition, Bicarbonate formation

Abstract: Capacity and kinetics of CO₂ capture of Na₂CO₃ were studied to determine the mechanism for CO₂ sequestration under ambient conditions. Bicarbonate formation of Na₂CO₃ was examined by a thermogravimetric analysis (TGA) under various CO₂ and water vapor concentrations and the accompanying structural changes of Na₂CO₃ were demonstrated by X-ray diffraction (XRD). Morphological variations were observed during the reaction of CO₂ capture through scanning electron microscope (SEM). Structural changes and morphological variations, which occurred during the course of the reaction, were then connected to the kinetic and exothermic properties of the CO₂ capture process from the XRD and SEM measurements. The results showed that the bicarbonate formation of Na₂CO₃ has two different pathways. For higher CO₂ and H₂O concentrations, the bicarbonate formation proceeded effectively. However, for lower CO₂ and H₂O concentrations, the reactions were more complicated. The formation of Na₂CO₃·H₂O from Na₂CO₃ as the first step, followed by the subsequent formation of Na₅H₃(CO₃)₄, and then the bicarbonate formation proceeds. To understand such fundamental properties in CO₂ capture of Na₂CO₃ is very important for utilization of Na₂CO₃ as a sorbent for CO₂ capture.

Key words: CO₂ capture, Sodium carbonate, Moist condition, Bicarbonate formation

Hongchao Luo, Hirofumi Kanoh. Fundamentals in CO₂ capture of Na₂CO₃ under a moist condition[J]. 能源化学(英文), 2017, 26(5): 972-983.

Hongchao Luo, Hirofumi Kanoh. Fundamentals in CO₂ capture of Na₂CO₃ under a moist condition[J]. Journal of Energy Chemistry, 2017, 26(5): 972-983.

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Fundamentals in CO₂ capture of Na₂CO₃ under a moist condition

Fundamentals in CO₂ capture of Na₂CO₃ under a moist condition

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