High-Temperature CO2 Sorption on Hydrotalcite Having a High Mg/Al Molar Ratio

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.