Alumina contribution to CO oxidation: A TPR and IR study

► γ-Al2O3 catalyzes CO oxidation to CO2 coupled to H2 formation. ► Surface hydroxyls are involved in the reaction. ► Linear -OH react faster than bridged -OH due to an easier condensation. ► Supported metal promotes the reaction through CO adsorption and spillover. ► Al2O3 contributes to CO oxidation in CO TPR/TPD of supported catalysts.