Abstract An effective catalyst of NOx storage and reduction (NSR), Pt–Ru/Ba/ACZ (ACZ=Al2O3–Ce0.33Zr0.67O2), has been presented through using ACZ as a support. The catalyst was well characterized by XRD, TEM, N2 physisorption, H2-TPR and XPS. Ce0.33Zr0.67 solid solution was formed in the catalyst. The effects of Ru addition on NSR performances were investigated. In comparison with Pt/Ba/ACZ, the addition of Ru in Pt–Ru/Ba/ACZ drops the reduction temperature of Pt, an obvious promoting effect on NSR was observed above 200°C. The presence of 5vol% CO2 in feed gas shows an inhibiting effect on NOx storage and reduction.