High temperature adsorption of CO2 on Mg-Al hydrotalcite: Effect of the charge compensating anions and the synthesis pH

Qiang Wang; Zhihuai Wu; Hui Huang Tay; Luwei Chen; Yan Liu; Jie Chang; Ziyi Zhong; Jizhong Luo; Armando Borgna

doi:10.1016/j.cattod.2010.10.042

High temperature adsorption of CO₂ on Mg-Al hydrotalcite: Effect of the charge compensating anions and the synthesis pH

Qiang Wang, Zhihuai Wu, Hui Huang Tay, Luwei Chen, Yan Liu, Jie Chang, Ziyi Zhong, Jizhong Luo^*, Armando Borgna

^*Corresponding author for this work

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

149 Scopus citations

Abstract

This work reported a detailed investigation on how charge compensating anions and synthesis pH affect the structural properties and CO₂ adsorption capacity of Mg-Al hydrotalcites (HTs). A series of Mg ₃Al₁-A (A = CO₃^2-, HCO ₃^-, NO₃^-, SO₄ ^2-, and Cl^-) HTs were synthesized and tested as high temperature CO₂ adsorbents. It was found that the anions have great effect on the thermal stability and morphology, as well as on the surface area of HTs, consequently influencing the CO₂ adsorption capacity of HT derivatives. Among various HTs, Mg₃Al₁-CO₃ showed the highest CO₂ adsorption capacity of 0.53 mmol/g. Next, the influence of synthesis pH on the Mg/Al ratio, BET surface area, pore size, and CO₂ adsorption capacity of Mg₃Al₁-CO ₃ was investigated. Mg₃Al₁-CO₃ synthesized at pH = 10-12 showed good performance for CO₂ adsorption. By doping Mg₃Al₁-CO₃ (pH = 10) with 20 wt.% K₂CO₃, the CO₂ adsorption capacity was increased up to 0.85 mmol/g.

Original language	English
Pages (from-to)	198-203
Number of pages	6
Journal	Catalysis Today
Volume	164
Issue number	1
DOIs	https://doi.org/10.1016/j.cattod.2010.10.042
State	Published - 30 Apr 2011
Externally published	Yes

Keywords

Anion effect
CO capture
Global warming
Layered double hydroxide
Sorption enhanced water gas shift

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title = "High temperature adsorption of CO2 on Mg-Al hydrotalcite: Effect of the charge compensating anions and the synthesis pH",

abstract = "This work reported a detailed investigation on how charge compensating anions and synthesis pH affect the structural properties and CO2 adsorption capacity of Mg-Al hydrotalcites (HTs). A series of Mg 3Al1-A (A = CO32-, HCO 3-, NO3-, SO4 2-, and Cl-) HTs were synthesized and tested as high temperature CO2 adsorbents. It was found that the anions have great effect on the thermal stability and morphology, as well as on the surface area of HTs, consequently influencing the CO2 adsorption capacity of HT derivatives. Among various HTs, Mg3Al1-CO3 showed the highest CO2 adsorption capacity of 0.53 mmol/g. Next, the influence of synthesis pH on the Mg/Al ratio, BET surface area, pore size, and CO2 adsorption capacity of Mg3Al1-CO 3 was investigated. Mg3Al1-CO3 synthesized at pH = 10-12 showed good performance for CO2 adsorption. By doping Mg3Al1-CO3 (pH = 10) with 20 wt.% K2CO3, the CO2 adsorption capacity was increased up to 0.85 mmol/g.",

keywords = "Anion effect, CO capture, Global warming, Layered double hydroxide, Sorption enhanced water gas shift",

author = "Qiang Wang and Zhihuai Wu and Tay, {Hui Huang} and Luwei Chen and Yan Liu and Jie Chang and Ziyi Zhong and Jizhong Luo and Armando Borgna",

note = "Funding Information: This work is financially supported by the Thematic Strategic Research Program (Grant No. 0921380024 ) from the Agency for Science, Technology and Research (A*STAR) of Singapore. The authors would like to thank Dr. M.K. Schreyer for his assistance in XRD data analysis, Dr. P.K Wong and Keith Carpenter for their support of this project.",

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doi = "10.1016/j.cattod.2010.10.042",

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T2 - Effect of the charge compensating anions and the synthesis pH

AU - Wang, Qiang

AU - Wu, Zhihuai

AU - Tay, Hui Huang

AU - Chen, Luwei

AU - Liu, Yan

AU - Chang, Jie

AU - Zhong, Ziyi

AU - Luo, Jizhong

AU - Borgna, Armando

N1 - Funding Information: This work is financially supported by the Thematic Strategic Research Program (Grant No. 0921380024 ) from the Agency for Science, Technology and Research (A*STAR) of Singapore. The authors would like to thank Dr. M.K. Schreyer for his assistance in XRD data analysis, Dr. P.K Wong and Keith Carpenter for their support of this project.

PY - 2011/4/30

Y1 - 2011/4/30

N2 - This work reported a detailed investigation on how charge compensating anions and synthesis pH affect the structural properties and CO2 adsorption capacity of Mg-Al hydrotalcites (HTs). A series of Mg 3Al1-A (A = CO32-, HCO 3-, NO3-, SO4 2-, and Cl-) HTs were synthesized and tested as high temperature CO2 adsorbents. It was found that the anions have great effect on the thermal stability and morphology, as well as on the surface area of HTs, consequently influencing the CO2 adsorption capacity of HT derivatives. Among various HTs, Mg3Al1-CO3 showed the highest CO2 adsorption capacity of 0.53 mmol/g. Next, the influence of synthesis pH on the Mg/Al ratio, BET surface area, pore size, and CO2 adsorption capacity of Mg3Al1-CO 3 was investigated. Mg3Al1-CO3 synthesized at pH = 10-12 showed good performance for CO2 adsorption. By doping Mg3Al1-CO3 (pH = 10) with 20 wt.% K2CO3, the CO2 adsorption capacity was increased up to 0.85 mmol/g.

AB - This work reported a detailed investigation on how charge compensating anions and synthesis pH affect the structural properties and CO2 adsorption capacity of Mg-Al hydrotalcites (HTs). A series of Mg 3Al1-A (A = CO32-, HCO 3-, NO3-, SO4 2-, and Cl-) HTs were synthesized and tested as high temperature CO2 adsorbents. It was found that the anions have great effect on the thermal stability and morphology, as well as on the surface area of HTs, consequently influencing the CO2 adsorption capacity of HT derivatives. Among various HTs, Mg3Al1-CO3 showed the highest CO2 adsorption capacity of 0.53 mmol/g. Next, the influence of synthesis pH on the Mg/Al ratio, BET surface area, pore size, and CO2 adsorption capacity of Mg3Al1-CO 3 was investigated. Mg3Al1-CO3 synthesized at pH = 10-12 showed good performance for CO2 adsorption. By doping Mg3Al1-CO3 (pH = 10) with 20 wt.% K2CO3, the CO2 adsorption capacity was increased up to 0.85 mmol/g.

KW - Anion effect

KW - CO capture

KW - Global warming

KW - Layered double hydroxide

KW - Sorption enhanced water gas shift

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DO - 10.1016/j.cattod.2010.10.042

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SP - 198

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JO - Catalysis Today

JF - Catalysis Today

IS - 1

ER -

High temperature adsorption of CO₂ on Mg-Al hydrotalcite: Effect of the charge compensating anions and the synthesis pH

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Keywords

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