Abstract: A series of B-site Fe-substituted defected perovskite BaCo_1-xFe_xO_3-δ catalyst samples for NO_x storage and reduction were prepared. The NO_x storage and sulfur-resistance performance were investigated. N₂ adsorption-desorption, X-ray diffraction, Infrared spectroscopy, temperature-programmed reduction, and temperature-programmed desorption were employed for structural characterization. Fe-substitution can increase the sulfur resistance ability of BaCoO₃ perovskite. Among the Fe-substituted samples, the one with x = 0.4 shows the largest NO_x storage capacity (NSC). After deep sulfation it still possesses higher NSC (398 μmol/g), showing strong sulfur resisting ability. The mobility of surface lattice oxygen and the amount of surface oxygen vacancies are highly related to the properties of the catalyst. The NO_x is mainly stored as ionic nitrate and monodentate nitrate species in the catalyst.

Key words: perovskite, barium cobalt, iron, substitution, nitrogen oxide, storage