Kinetically rate-determining step modulation by metal-support interactions for CO oxidation on Pt/CeO2

Rational design and performance promotion are eternal topics and ultimate goals in catalyst preparation. In contrast, trial-and-error is still the common method people take. Therefore, it is important to develop methods to intrinsically enhance the performance of catalysts. The most effective solutions are the one from a kinetic perspective based on clear knowledge of the reaction mechanism. This paper describes rate-determining step cognition and modulation to promote CO oxidation on highly dispersed Pt on CeO2. The different degrees of metal-support interactions due to variation of hydroxyl density of support could alter the structure of active species and the ability of oxygen activation apparently, further shift the rate-determining step from oxygen activation to oxygen reverse spillover kinetically. The transformation of rate-determining step could enhance the intrinsic activity significantly, and decrease the T-50 approximately 140 degrees C. The findings of this research exemplify the universal and effective method of performance elevation by rate-determining step modulation, which is promising for application in different systems.

Automated summary

This study successfully enhances the performance of Pt/CeO2 catalyst by modulating the rate-determining step, demonstrating the universality and effectiveness of this method for improving catalyst performance.