No abstract

Fe and Fe–O dispersed on nanoscale CeO supports are considered promising catalysts for oxidation and reduction catalysis and regarded as one of the better alternatives to precious metal catalysts for NO reduction. To understand the role of Fe ions, promoters, and factors that control the NO x reduction, we probed the local environments of Fe, Ce, and O using a range of spectroscopies. The order of Na promotion (sequential vs simultaneous) resulted in a significant difference in the catalytic activity by changing the local electronic structure around the Fe ions in reaction the conditions. The Ce M4,5- and O K-edge X-ray spectroscopy results suggest stabilization of the 4f, eg orbitals, where Fe and promotor ions are affecting the t2g orbitals. Optimizing this bonding environment around the Fe active species with a promoter ion enables tuning of the NO reduction activity.

A thermally robust coating prevents sintering of platinum particles and adds functionality by exhibiting oxygen storage and release.

Precious metal doped BaCeO3 compounds show catalytic activity toward NO an order of magnitude higher than traditional supported precious metals.