Kinetics and mechanism of propylene hydro-oxidation to acrolein on Au catalysts

Propylene epoxidation by H-2 and O-2 to propylene oxide (PO) over the Au-Ti bifunctional catalysts, as an ideal reaction for PO production, has attracted great interest. Revealing the mechanism of acrolein formation is of great importance for understanding the mechanism of molecular oxygen activation and the formation of hydroperoxo species on the Au sites. Here, we investigate the reaction mechanism of propylene oxidation to acrolein on the Au/uncalcined TS-1 (Au/TS-1-B) catalyst through a combination of multiple characterization, H-2/D-2 exchange, kinetics experiment, and modeling. The Ti sites are found to be non-essential to acrolein formation. Moreover, the acrolein formation on the Au/TS-1-B catalyst is confirmed to be promoted by H-2 through hydroperoxo species formation, which includes two main steps: propylene dehydrogenation to *C3H5 with the aid of *OOH species, and *C3H5 oxidation by *OOH to acrolein. The latter step is determined to be the rate-determining step because the corresponding kinetics model gives the best description for experimental results. This work not only provides kinetics insights for the propylene hydro-oxidation to acrolein on the Au-Ti bifunctional catalysts, but also facilitates the rational design of Au catalysts with high activity and selectivity in the direct propylene epoxidation with H-2 and O-2.

Automated summary

Understanding the mechanism of acrolein formation during propylene oxidation on Au/uncalcined TS-1 catalyst is important for understanding oxygen activation and hydroperoxo species formation on Au sites. In this study, the formation of acrolein was found to be promoted by H-2 through hydroperoxo species formation on the Au/TS-1-B catalyst. This research provides insights for the propylene hydro-oxidation and facilitates the design of highly active and selective Au catalysts for direct propylene epoxidation.