Reaction between calcium hydroxide and carbon dioxide

Abstract

Calcium hydroxide powder was fabricated from calcium nitrate solution. The powder was heated in CO₂ atmosphere at different pressures and the change in weight was measured to monitor the reaction between hydroxide and CO₂. At high Pco₂, the direct reaction between hydroxide and CO₂ took place to form calcium carbonate. At low Pco₂, the hydroxide first decomposed into oxide and then reacted with CO₂ to form calcium carbonate. The decomposition could not be suppressed in CO₂ which was saturated with H₂O at room temperature.