Abstract: The adsorption behaviors of CO2 and CO2＋H2 on zirconia polymorphs were investigated by FT-IR technique. The results showed that absorbed CO2 and surface intermediates varied with zirconia polymorphs. Bicarbonate and ion carbonate species were detected on amorphous zirconia. In addition to the two species, bidented carbonate was also formed on monoclinic zirconia. The strongest adsorbed CO2 and polydentate carbonate species were found on tetragonal zirconia. In the case of CO2 hydrogenation, methane was formed on monoclinic zirconia while formate species was observed on tetragonal zirconia.

Key words: Zirconia, FT-IR, CO₂ adsorption, CO₂＋H₂