Impregnation of hydrotalcite with NaNO3 for enhanced high-temperature CO2 sorption uptake

Suji Kim; Ki Bong Lee

doi:10.1016/j.cej.2018.08.207

Impregnation of hydrotalcite with NaNO₃ for enhanced high-temperature CO₂ sorption uptake

Suji Kim, Ki Bong Lee

Department of Chemical and Biological Engineering

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

13 Citations (Scopus)

Abstract

Impregnation with alkali metals is a convenient and attractive way to enhance the CO₂ sorption uptake of hydrotalcite. In this study, NaNO₃ was used as a novel alkali metal precursor to increase the basicity of commercial hydrotalcite. Also, the influence of NaNO₃ on the structural and textural properties and the CO₂ sorption performance were investigated for hydrotalcites having different Mg:Al molar ratios. The change in the pore structure after impregnation with NaNO₃ was investigated by N₂ adsorption–desorption analysis, and the crystalline structures of hydrotalcites with different Mg:Al molar ratios were compared using X-ray diffraction. Because of the basicity increase caused by introducing NaNO₃, enhanced CO₂ sorption uptake was obtained for the hydrotalcites, and the hydrotalcite containing 30 wt% NaNO₃ in a mixed MgO and Al₂O₃ structure showed the highest CO₂ uptake of 1.15 mol·kg⁻¹ at 200 °C and 1 atm. The degree of enhancement in the CO₂ sorption uptake was dependent on the Mg:Al molar ratio in pristine hydrotalcite. Large amounts of Al₂O₃ appeared to highly destabilize the functional groups on the surface of the hydrotalcite, contributing to the increased basicity and CO₂ sorption performance of hydrotalcite.

Original language	English
Pages (from-to)	964-972
Number of pages	9
Journal	Chemical Engineering Journal
Volume	356
DOIs	https://doi.org/10.1016/j.cej.2018.08.207
Publication status	Published - 2019 Jan 15

Bibliographical note

Funding Information:
This work was supported by “Energy Technology Development Business” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Korean government Ministry of Trade, Industry & Energy (No. 20182020201260) 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 Ministry of Science and ICT.

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

High-temperature CO sorption
Hydrotalcite
Impregnation
NaNO

ASJC Scopus subject areas

Chemistry(all)
Environmental Chemistry
Chemical Engineering(all)
Industrial and Manufacturing Engineering

Access to Document

10.1016/j.cej.2018.08.207

Cite this

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title = "Impregnation of hydrotalcite with NaNO3 for enhanced high-temperature CO2 sorption uptake",

abstract = "Impregnation with alkali metals is a convenient and attractive way to enhance the CO2 sorption uptake of hydrotalcite. In this study, NaNO3 was used as a novel alkali metal precursor to increase the basicity of commercial hydrotalcite. Also, the influence of NaNO3 on the structural and textural properties and the CO2 sorption performance were investigated for hydrotalcites having different Mg:Al molar ratios. The change in the pore structure after impregnation with NaNO3 was investigated by N2 adsorption–desorption analysis, and the crystalline structures of hydrotalcites with different Mg:Al molar ratios were compared using X-ray diffraction. Because of the basicity increase caused by introducing NaNO3, enhanced CO2 sorption uptake was obtained for the hydrotalcites, and the hydrotalcite containing 30 wt% NaNO3 in a mixed MgO and Al2O3 structure showed the highest CO2 uptake of 1.15 mol·kg−1 at 200 °C and 1 atm. The degree of enhancement in the CO2 sorption uptake was dependent on the Mg:Al molar ratio in pristine hydrotalcite. Large amounts of Al2O3 appeared to highly destabilize the functional groups on the surface of the hydrotalcite, contributing to the increased basicity and CO2 sorption performance of hydrotalcite.",

keywords = "High-temperature CO sorption, Hydrotalcite, Impregnation, NaNO",

author = "Suji Kim and Lee, {Ki Bong}",

note = "Funding Information: This work was supported by “Energy Technology Development Business” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Korean government Ministry of Trade, Industry & Energy (No. 20182020201260) 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 Ministry of Science and ICT. Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

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AB - Impregnation with alkali metals is a convenient and attractive way to enhance the CO2 sorption uptake of hydrotalcite. In this study, NaNO3 was used as a novel alkali metal precursor to increase the basicity of commercial hydrotalcite. Also, the influence of NaNO3 on the structural and textural properties and the CO2 sorption performance were investigated for hydrotalcites having different Mg:Al molar ratios. The change in the pore structure after impregnation with NaNO3 was investigated by N2 adsorption–desorption analysis, and the crystalline structures of hydrotalcites with different Mg:Al molar ratios were compared using X-ray diffraction. Because of the basicity increase caused by introducing NaNO3, enhanced CO2 sorption uptake was obtained for the hydrotalcites, and the hydrotalcite containing 30 wt% NaNO3 in a mixed MgO and Al2O3 structure showed the highest CO2 uptake of 1.15 mol·kg−1 at 200 °C and 1 atm. The degree of enhancement in the CO2 sorption uptake was dependent on the Mg:Al molar ratio in pristine hydrotalcite. Large amounts of Al2O3 appeared to highly destabilize the functional groups on the surface of the hydrotalcite, contributing to the increased basicity and CO2 sorption performance of hydrotalcite.

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