Chemisorption of carbon dioxide on potassium-carbonate-promoted hydrotalcite

摘要: Abstract New equilibrium and column dynamic data for chemisorption of carbon dioxide from inert nitrogen at 400 520 °C were measured on a sample potassium-carbonate-promoted hydrotalcite, which was reversible chemisorbent CO2. The isotherms Langmuirian in the low-pressure region ( p CO 2 0.2 atm ) with large gas–solid interaction parameter. deviated behavior higher pressure region. A new analytical model that simultaneously accounted CO2 adsorbent surface additional reaction between gaseous sorbed molecules proposed to describe data. also capable describing unique loading dependence isosteric heat reported literature. breakthrough curves sorption N2 could be described by linear driving force (LDF) conjunction isotherm. mass-transfer coefficients (i) independent feed gas concentration range given temperature (ii) weak function temperature. ratio zone length very low due highly favorable equilibrium.