(704g) Influence of Support and Environment on the Structure and Properties of Oxide Supported Isolated Pt Atoms
AIChE Annual Meeting
2018 AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Fundamentals of Catalysis III: Oxidation in Supported Catalysis
Thursday, November 1, 2018 - 5:18pm to 5:36pm
Here we demonstrate an approach to overcome these challenges and synthesize oxide supported isolated Pt species that do not sinter to form Pt clusters through pre-treatment, characterization, and reactivity analysis. We use a combination of site specific and sample averaged characterization to unambiguously identify isolated Pt atoms and understand their structure and reactivity. The effects of support composition (TiO2 and CeO2) and pretreatment conditions (oxidation and reduction pre-treatment at varying temperature) on the local coordination and catalytic properties of isolated sites will be discussed. Kinetic measurements and site-specific probe molecule characterization allow for mechanistic comparisons between isolated Pt atoms in various local coordination environments and ~1 nm Pt nanoparticles supported on reducible oxides in the context of CO oxidation catalysis.