Oxygen storage capacity of noble metal car exhaust catalysts containing nickel and cerium

Abstract Oxygen storage capacity as a function of temperature was measured for two different monolithic car exhaust catalysts. Mass spectrometry connected on-line to a flow reactor was used for quantification of oxygen uptake and reduction, respectively. Both catalysts contained Pt, Rh, and Ce supported by Al 2 O 3 . One of the catalysts also contained Ni. The amount of oxygen that can be taken up/reduced away is strongly temperature-dependent in the range investigated (300–900 K). When present, Ni dominates the oxygen storage capacity at high temperatures. In the catalyst lacking Ni, Ce dominates the storage capacity at high temperatures. At lower temperatures chemisorbed oxygen on Pt Rh seems to play an essential role.