Role and distribution of different Ba-containing phases in supported Pt-Ba NSR catalysts

Figure 1 shows the NO x and CO removal efficiencies (%) during the lean-rich cycles as a function of the temperature for Pt-RhBa, CuZSM-5 catalysts and physically mixed catalyst

NOx storage capacity, sulphur resistance and regeneration of Pt/CeZr and Pt/Ba/CeZr catalysts were studied and compared to a Pt/Ba/Al model catalyst... Both NO

Fe addition to Pt/Ba/Al 2 O 3 leads only to a small increase of NOx storage capacity, and more interestingly, to a better sulfur removal due to the inhibition of bulk barium

The better NOx storage properties of the catalysts treated under N 2 before aging are due to (i) a higher NO oxidation activity (mainly linked to a higher platinum dispersion) (ii)

The deactivation of a Pt/Ba/Al 2 O 3 NOx-trap model catalyst submitted to SO 2 treatment and/or thermal ageing at 800°C was studied by H 2 temperature programmed reduction (TPR),

It resulted mainly from: (i) enhanced dispersions of platinum and barium on the alumina-silica support, (ii) a high Pt-Ba proximity and (iii) a low basicity of the catalyst

If the regeneration of the sulfated catalyst is undertaken at 800°C in rich hydrogen mixture containing CO 2 and water, all sulfur is eliminated but the initial

On the other hand, the regeneration treatment leads to lower NOx storage trapping properties on sulfated Pt/10Ba/Al and Pt/20Ba/Al5.5Si catalysts annealed at 800°C, while