Promoting Metal–Support Interaction on Pt/TiO2 Catalyst by Antimony for Enhanced Carbon Monoxide Oxidation Activity at Room Temperature

In this study, Pt/TiO2-R catalytic activity during carbon monoxide (CO) oxidation at room temperature (25 °C) was enhanced by the addition of antimony (Sb) as a promoter. Antimony increases the surface oxygen of TiO2, which causes the large amounts of oxygen vacancies at reduction condition. Metallic Pt sites that come into contact with oxygen vacancies cause significant electron donation between the metal and support to facilitate metal–support interaction effect. The improved metal–support interaction effect increased the electron density on the Pt sites of Pt/Sb/TiO2-R, and the redox properties were enhanced owing to the unstable surface state. In the results, CO oxidation activity and durability of Pt/Sb/TiO2-R were improved than Pt/TiO2-R by enhanced oxygen mobility at room temperature.