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Updated: Mar 24, 2026

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High-Temperature CO2 Sorption on Hydrotalcite Having a High Mg/Al Molar Ratio
Suji Kim1, Sang Goo Jeon2, Ki Bong Lee1
1Department of Chemical and Biological Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Republic of Korea.
Abstract:
Hydrotalcites having a Mg/Al molar ratio between 3 and 30 have been synthesized as promising high-temperature CO2 sorbents. The existence of NaNO3 in the hydrotalcite structure, which originates from excess magnesium nitrate in the precursor, markedly increases CO2 sorption uptake by hydrotalcite up to the record high value of 9.27 mol kg(-1) at 240 °C and 1 atm CO2.
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