As automotive applications move toward cooler engine temperatures and regulations tighten allowable emissions, storing NOx until a suitable temperature has been reached for a decomposition reaction to occur remains an active avenue of materials research.  Previous work to develop a simplistic synthetic method for a catalytically active Pt nanoparticle to be protected from sintering by a ceria shell exhibited sufficient porosity to allow diffusion of carbon monoxide, hydrocarbons, and nitrogen oxides to the reactive Pt center.  The addition of ceria to the shell did not hinder the gas migration nor decrease the catalytic activity but did add functionality as an oxygen storage component.  Our current work investigating NOx storage materials has shown that the Pt@SiO<sub>x</sub>*CeO<sub>y</sub> composite also exhibits NO storage properties which rival current state of the art materials.  Our studies have shown the nitrite formation at temperatures below 100 °C transforming nitrate compounds prior to the desorption of the NOx species.  The shell porosity and tortuosity The NOx storage capacity, temperature range, and mechanism will be explored.  Beyond simply a two-component shell, the process of creating a multi-component shell with additional other rare earth dopants and their impact on the NOx storage properties will be discussed.

Morphology control for NOx storage catalysts

2019 Spring National Meeting

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