Role of Surface Oxygen Vacancies in Intermediate Formation on Mullite-type Oxides upon NO Adsorption

Identifying the nature and reactivity of surface intermediate species is critical to understanding the fundamental reaction pathways of NO oxidation on mullite-type oxide catalysts. Using in situ Fourier transform infrared spectroscopy and density functional theory calculations, we examine the intermediates formed during NO adsorption on SmMn2O5 with different surface conditions (as-made, oxidized, and reduced surfaces). Nitrite (NO2–) species...