Abstract
The use of NOx traps is one strategy being pursed to enable the implementation of more fuel-efficient lean-burn gasoline engines. Materials development to enhance NOx storage capacity and sulfur tolerance will be necessary for performance improvement. Progress in these areas will benefit from a more detailed understanding of the base metal oxide−precious metal surface chemistry involved in the trapping, release, and reduction of NOx. In this work, we have focused on the adsorption of NO and NO2 on in-situ evaporated thin films of barium oxide, the primary storage material in lean NOx traps, to accentuate the details of the trapping stage of NOx conversion using these systems. X-ray photoelectron spectroscopy has been used to identify the species formed and their relative abundance following room-temperature adsorption. Annealing experiments were performed to follow changes in adsorbed species with temperature. For NO, our results are consistent with nitrites forming as a result of molecular adsorption. In...
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