Jaeha Lee

Suppressed Strong Metal–Support Interactions in Platinum on Sulfated Titania and Their Influence on the Oxidation of Carbon Monoxide

Strong metal–support interactions (SMSI), which are evidenced by the coverage of Pt by the TiO2 support under reducing conditions, were suppressed upon loading Pt on sulfated TiO2 (S‐TiO2), according to controlled CO chemisorption results. Combined X‐ray diffraction (XRD) and X‐ray absorption near‐edge structure (XANES) studies showed that the Pt species interacted more strongly with the sulfur‐free TiO2 surface than with the sulfated TiO2 surface, which thereby facilitated the formation of SMSIs at low temperatures. Weakened interactions between Pt and S‐TiO2 led to the formation of large Pt clusters with more metallic character. CO oxidation on the Pt/S‐TiO2 and Pt/TiO2 catalysts revealed that the temperature for 50 % conversion was lower on Pt/S‐TiO2 than on Pt/TiO2 by more than 50 °C. It was concluded that the metal–support interactions between Pt and TiO2 could be controlled by S species on TiO2, and this ultimately influenced the CO oxidation ability of the catalyst.