(224a) Active Sites and Mechanisms for Vapor-Phase Decomposition of Formic Acid on Pt Catalysts
Despite numerous studies in the literature, the reaction mechanism and the nature of the reactive intermediate are still under debate. In this study, we present a combined approach utilizing density functional theory (DFT) calculationson Pt(100) and Pt(111)5 facets, reaction kinetics experiments using carbon supported Pt catalysts, and mean field microkinetic modeling6. This approach allows us to identify a coverage self-consistent description for the active site and gain deeper understanding of the reaction mechanism. The results also give insight into the nature of the reactive intermediate, rate-determining steps, and surface environment under reaction conditions. Our coverage self-consistent model predicts the (111) facet to be the active site with the reaction flux passing through the carboxyl mechanism.
Fundamental understanding of the reaction mechanism derived from this work, will advance the consideration of FA as a hydrogen storage option and can serve as the basis for design of improved catalysts for its decomposition to H2.
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