Adsorption of carbon dioxide onto hydrotalcite-like compounds (HTlcs) at high temperatures

The adsorption capacities of carbon dioxide on six commercial hydrotalcite- like compounds and the main factors (aluminum content, anion type, water co ntent, and heat treatment temperature) influencing their adsorption capacit y at high temperatures have been investigated using a gravimetric technique . There is an optimum aluminum content and heat treatment temperature for t he adsorption capacity. The carbonate anion favors adsorption of carbon dio xide compared to OH-, and a low content of water also improves the adsorpti on capacity. The carbon dioxide adsorption capacity is mainly dependent on the microporous volume, interlayer spacing, and layer charge density of the hydrotalcite-like compounds.