Crystalline high–entropy (HE) materials have attracted increasing interest due to their unique structure and high temperature stability. Up to now, there have only been a few reports on HE materials for application in high–temperature stabilized catalysis, which presents a significant challenge because of aggregation during high temperature operation. Here, we leverage this entropically–induced metal atom stabilization to synthesize metal oxide supported single noble metal atom catalysts. We show that the entropy–stabilized metal oxide solid solution (NiMgCoZnCo)O can act both as a CO oxidation catalyst and as an excellent support to stabilize single atomically dispersed platinum species, even at temperatures up to 900 °C. The use of Pt, Ni, Mg, Cu, Zn, and Co not only enables the active sites to be highly dispersed for high catalytic activity in CO oxidation but also results in extreme thermal stability owing to the entropy–stabilized behavior inside the metal oxide solution to survive the harsh conditions (up to 900 °C). We expect this innovative strategy will inspire much work on the synthesis of high–temperature materials for industrial catalysis.

Entropy–stabilized metal oxides for efficient CO oxidation with high-temperature stability

2019 Spring National Meeting

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