(468f) Using Reductive Approach to Synthesize Atomically Dispersed Pt Catalysts Via Strong Metal Support Interaction

Heterogeneous catalysts play a crucial role in the modern chemical industry to produce upgraded fuels, commodity and specialty chemicals, and for energy generation production. However, hat after catalyst calcination and activation many different metal species are present on the support which hinders active sites identification and thus the development of highly efficient catalyst. For reactions that are catalyzed by supported catalytically active single metal atoms, new opportunities are afforded.

It is of great interest to construct active metal sites with 100% metal atom utilization efficiency for catalytic processes. However, it remains a challenge to achieve this goal due to limitations in tools kit for atomically dispersed catalysts synthesis that usually requires multiple steps, unique supports, and extreme low metal loading. Mixed metal oxides are widely used in developing catalyst and the role of adding one more metal oxide is intriguing but complex

Here, we show that grafting another metal oxide to form hetero-metal oxides can effectively anchor a Pt atom through a bridging oxygen, metal, or both. The variety of binding sites yield atomically dispersed metals with various coordination environments, which is demonstrated by in-situ CO IR, EXAFS, and STEM.

The platinum loading in these systems can remain atomically dispersed up to a loading of 0.5 wt.%. The synthesized atomically dispersed Pt catalyst exhibits higher activity and selectivity for propane dehydrogenation to propylene. The method developed here paves a way for synthesizing various single atom catalysts and manipulating metal atom coordination environment for more efficient chemical processes.