O− spin bags formation in (CeO2)0.75(La2CuO4)0.24 catalyst after extended use for reduction of NO by CO

Abstract

CeO 2 ) 1 _y.(La2 CuO4) with y = 0.25 and 0.43 have been analyzed by EPR after an extended-time-on-stream run at 450°C, employing them as catalysts for the title reaction. Some unusual EPR low-field features have been observed, attributed to the formation of O -spin bags at low temperature.