A study of the NO<f>x</f> storage catalyst of Ba–Fe–O complex oxide

The complex oxide Ba–Fe–O catalysts were prepared by sol–gel method. The XRD, DTA, NO-TPD, XPS and NSC measurements were used to characterize the structures, NO<f>x</f> storage property and sulfur resistance ability. It is concluded that when coadsorption of NO and O2 at 400 °C, the sample calcined at 750 °C possesses high NO<f>x</f> storage capacity and sulfur resistance. The perovskite type BaFeO3 and BaFeO<f>3−x</f> phases are the active centers in the catalyst for NO<f>x</f> storage. [Copyright &y& Elsevier]