Na2CO3-doped CaO-based high-temperature CO2 sorbent and its sorption kinetics

Chan Hyun Lee; Seung Wan Choi; Hyung Jin Yoon; Hyuk Jae Kwon; Hyun Chul Lee; Sang Goo Jeon; Ki Bong Lee

doi:10.1016/j.cej.2018.06.141

Na₂CO₃-doped CaO-based high-temperature CO₂ sorbent and its sorption kinetics

Chan Hyun Lee, Seung Wan Choi, Hyung Jin Yoon, Hyuk Jae Kwon, Hyun Chul Lee, Sang Goo Jeon, Ki Bong Lee

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

72 Citations (Scopus)

Abstract

CaO-based sorbents have received much research attention for high-temperature CO₂ capture because of their high theoretical sorption capacities. However, harsh conditions are needed to regenerate CaO-based sorbents, and their high CO₂ sorption capacities diminish significantly in cyclic sorption procedures owing to thermal sintering effects. To solve these problems, dopant components have been applied to CaO-based sorbents. In this study, a new CaO-based sorbent containing Na₂CO₃ was synthesized using a precipitation method. The prepared sorbent (Na₂CO₃-CaO) was characterized using various analytic methods, and its CO₂ sorption performance was studied using thermogravimetric analysis. Na₂CO₃-CaO showed high CO₂ affinity above 600 °C, and its sorption/regeneration kinetics were faster than those of the conventional CaO sorbent. To investigate the CO₂ sorption mechanism onto Na₂CO₃-CaO, the change in crystalline structure with respect to temperature was analyzed using in-situ X-ray diffraction; the results revealed that the double salt Na₂Ca(CO₃)₂ was generated from the reaction of CO₂ with CaO and Na₂CO₃. Kinetic models were also developed to describe the CO₂ sorption behavior of Na₂CO₃-CaO. The results of this study advance our understanding of the effect of alkali metal carbonates on CaO-based sorbents.

Original language	English
Pages (from-to)	103-109
Number of pages	7
Journal	Chemical Engineering Journal
Volume	352
DOIs	https://doi.org/10.1016/j.cej.2018.06.141
Publication status	Published - 2018 Nov 15

Bibliographical note

Funding Information:
This study was supported by the Samsung Advanced Institute of Technology , Samsung Electronics. Co. Ltd. , and the Basic Science Research Program [ 2015R1A1A1A05001363 ] and the Super Ultra Low Energy and Emission Vehicle Engineering Research Center [NRF-2016R1A5A1009592] of the National Research Foundation of Korea (NRF), funded by the Korean Government through the Ministry of Science, ICT and Future Planning .

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

CaO-based sorbent
Carbon dioxide
Sodium carbonate
Sorption
Sorption kinetics

ASJC Scopus subject areas

General Chemistry
Environmental Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

Access to Document

10.1016/j.cej.2018.06.141

Cite this

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title = "Na2CO3-doped CaO-based high-temperature CO2 sorbent and its sorption kinetics",

abstract = "CaO-based sorbents have received much research attention for high-temperature CO2 capture because of their high theoretical sorption capacities. However, harsh conditions are needed to regenerate CaO-based sorbents, and their high CO2 sorption capacities diminish significantly in cyclic sorption procedures owing to thermal sintering effects. To solve these problems, dopant components have been applied to CaO-based sorbents. In this study, a new CaO-based sorbent containing Na2CO3 was synthesized using a precipitation method. The prepared sorbent (Na2CO3-CaO) was characterized using various analytic methods, and its CO2 sorption performance was studied using thermogravimetric analysis. Na2CO3-CaO showed high CO2 affinity above 600 °C, and its sorption/regeneration kinetics were faster than those of the conventional CaO sorbent. To investigate the CO2 sorption mechanism onto Na2CO3-CaO, the change in crystalline structure with respect to temperature was analyzed using in-situ X-ray diffraction; the results revealed that the double salt Na2Ca(CO3)2 was generated from the reaction of CO2 with CaO and Na2CO3. Kinetic models were also developed to describe the CO2 sorption behavior of Na2CO3-CaO. The results of this study advance our understanding of the effect of alkali metal carbonates on CaO-based sorbents.",

keywords = "CaO-based sorbent, Carbon dioxide, Sodium carbonate, Sorption, Sorption kinetics",

author = "Lee, {Chan Hyun} and Choi, {Seung Wan} and Yoon, {Hyung Jin} and Kwon, {Hyuk Jae} and Lee, {Hyun Chul} and Jeon, {Sang Goo} and Lee, {Ki Bong}",

note = "Funding Information: This study was supported by the Samsung Advanced Institute of Technology , Samsung Electronics. Co. Ltd. , and the Basic Science Research Program [ 2015R1A1A1A05001363 ] and the Super Ultra Low Energy and Emission Vehicle Engineering Research Center [NRF-2016R1A5A1009592] of the National Research Foundation of Korea (NRF), funded by the Korean Government through the Ministry of Science, ICT and Future Planning . Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = nov,

day = "15",

doi = "10.1016/j.cej.2018.06.141",

language = "English",

volume = "352",

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journal = "Chemical Engineering Journal",

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TY - JOUR

T1 - Na2CO3-doped CaO-based high-temperature CO2 sorbent and its sorption kinetics

AU - Lee, Chan Hyun

AU - Choi, Seung Wan

AU - Yoon, Hyung Jin

AU - Kwon, Hyuk Jae

AU - Lee, Hyun Chul

AU - Jeon, Sang Goo

AU - Lee, Ki Bong

N1 - Funding Information: This study was supported by the Samsung Advanced Institute of Technology , Samsung Electronics. Co. Ltd. , and the Basic Science Research Program [ 2015R1A1A1A05001363 ] and the Super Ultra Low Energy and Emission Vehicle Engineering Research Center [NRF-2016R1A5A1009592] of the National Research Foundation of Korea (NRF), funded by the Korean Government through the Ministry of Science, ICT and Future Planning . Publisher Copyright: © 2018 Elsevier B.V.

PY - 2018/11/15

Y1 - 2018/11/15

N2 - CaO-based sorbents have received much research attention for high-temperature CO2 capture because of their high theoretical sorption capacities. However, harsh conditions are needed to regenerate CaO-based sorbents, and their high CO2 sorption capacities diminish significantly in cyclic sorption procedures owing to thermal sintering effects. To solve these problems, dopant components have been applied to CaO-based sorbents. In this study, a new CaO-based sorbent containing Na2CO3 was synthesized using a precipitation method. The prepared sorbent (Na2CO3-CaO) was characterized using various analytic methods, and its CO2 sorption performance was studied using thermogravimetric analysis. Na2CO3-CaO showed high CO2 affinity above 600 °C, and its sorption/regeneration kinetics were faster than those of the conventional CaO sorbent. To investigate the CO2 sorption mechanism onto Na2CO3-CaO, the change in crystalline structure with respect to temperature was analyzed using in-situ X-ray diffraction; the results revealed that the double salt Na2Ca(CO3)2 was generated from the reaction of CO2 with CaO and Na2CO3. Kinetic models were also developed to describe the CO2 sorption behavior of Na2CO3-CaO. The results of this study advance our understanding of the effect of alkali metal carbonates on CaO-based sorbents.

AB - CaO-based sorbents have received much research attention for high-temperature CO2 capture because of their high theoretical sorption capacities. However, harsh conditions are needed to regenerate CaO-based sorbents, and their high CO2 sorption capacities diminish significantly in cyclic sorption procedures owing to thermal sintering effects. To solve these problems, dopant components have been applied to CaO-based sorbents. In this study, a new CaO-based sorbent containing Na2CO3 was synthesized using a precipitation method. The prepared sorbent (Na2CO3-CaO) was characterized using various analytic methods, and its CO2 sorption performance was studied using thermogravimetric analysis. Na2CO3-CaO showed high CO2 affinity above 600 °C, and its sorption/regeneration kinetics were faster than those of the conventional CaO sorbent. To investigate the CO2 sorption mechanism onto Na2CO3-CaO, the change in crystalline structure with respect to temperature was analyzed using in-situ X-ray diffraction; the results revealed that the double salt Na2Ca(CO3)2 was generated from the reaction of CO2 with CaO and Na2CO3. Kinetic models were also developed to describe the CO2 sorption behavior of Na2CO3-CaO. The results of this study advance our understanding of the effect of alkali metal carbonates on CaO-based sorbents.

KW - CaO-based sorbent

KW - Carbon dioxide

KW - Sodium carbonate

KW - Sorption

KW - Sorption kinetics

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