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                <term xml:lang="en">ceria–zirconia</term>
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                <term xml:lang="en">SO2</term>
                <term xml:lang="en">NOx trap</term>
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              <p>NOx storage capacity, sulphur resistance and regeneration of 1wt%Pt/Ce 0.7Zr 0.3 O2 (Pt/CeZr) and 1wt%Pt/10wt%BaO/Ce0.7Zr 0.3 O2 (Pt/Ba/CeZr) catalysts were studied and compared to a 1wt%Pt/10wt%BaO/Al2 O3 (Pt/Ba/Al) model catalystsubmitted to the same treatments. Pt/Ba/CeZr presents the best NOx storage capacity at 400 °C in accordance with basicitymeasurements by CO2 TPD and Pt/CeZr shows the better performance at 200 °C mainly due to a low sensitivity to CO2 at thistemperature. For all samples, sulphating induces a detrimental effect on NOx storage capacity but regeneration at 550 °C underrich conditions generally leads to the total recovery of catalytic performance. However, the nearly complete sulphur elimination isonly observed on Pt/CeZr. Moreover, an oxidizing treatment at 800 °C leads to partial sulphates elimination on the Pt/CeZrcatalyst whereas a stabilization of sulphates on Ba containing species is observed.</p>
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