Highly Stable and Active Supported Metal Catalysts for CO Oxidation

Yong  Wang, PNNL/WSU

Achieving both low temperature activity and high temperature stability of supported metal catalysts is a challenge for vehicle aftertreatment. Especially under harsh reaction conditions, the loss of catalytic activity is either due to metal particle growth (“sintering”) or reaction of metal with the support materials to form solid solution.  We report the synthesis of ceria supported Pt catalyst for CO oxidation by trapping atomically dispersed Pt over CeO₂, and its activation by steam and CO which shows T₁₀₀ < 150°C while possessing excellent hydrothermal stability even at 750°C.  Catalytic reaction kinetics combining with mechanistic studies using in-situ FTIR and DFT calculations were used to provide insight on the nature of active sites and reaction mechanism.

References:

Jones et al. Science 353 (2016) 6295.

Nie et al Science, 2017, 358, 1419-1423.