Abstract
Through in situ time-resolved X-ray absorption spectroscopy (XAS), we observed the dynamic behavior of the formation of two-dimensional low-coordinated Pt particles through reduction of PtOx particles by H2, which were under metal-support interaction (MSI) with the γ-Al2O3 support. The relatively stabilized PtOx species were reduced below 373 K, and the interfacial PtOx species on γ-Al2O3 surface were reduced above 373 K. The time-resolved Pt L3-edge XAS revealed that the morphology changed from three-dimensional PtOx particles to two-dimensional low-coordinated Pt particles during the in situ reduction of PtOx/Al2O3 at 473 K, whereas at 373 K, the interfacial PtOx species remained after its reduction. This study demonstrated that in situ time-resolved XAS is one of the most definitive techniques to unveil the MSI effect during the reductive formation process of Pt nanoparticle catalysts loaded on γ-Al2O3.
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