Abstract
A series of Pt and Pt,Cu supported catalysts was prepared by impregnation of Mg–Al supports obtained from hydrotalcite-type (HT) precursor compounds calcined at different temperatures. These NOx storage-reduction (NOxSR) catalysts show improved performances in NOx storage respect to Pt–Ba/Al2O3 NOxSR catalysts at reaction temperatures lower than 473 K. These catalysts also show improved resistance to deactivation by SO2. The co-presence of Pt and Cu (at different ratio Pt/Cu and using different impregnation methods) slightly worsens low temperature activity, but considerably promotes the resistance to deactivation after severe hydrothermal treatment and in presence of SO2. The overall Pt–Cu/HT performances are thus higher than those of the Pt–Ba/Al2O3 Toyota-type NOxSR catalysts.
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