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Efficient Mixed-Model Association

Berland et al. also studied the combination of a model NSR catalyst (1 % Pt/ 10 % Ba0/Al203, denoted as Pt/Ba-Al) with oxides-based SCR samples [84]. WO3 supported over ceria-zirconia oxides (W03/Ce-Zr) were studied as the active NH3-SCR catalysts. The effect of the composition of the ceria-zirconia mixed oxides was studied with a constant WO3 loading (10 wt.% of W, added by impregnation). It is demonstrated that Pt/Ba-Al NSR catalyst can release important amount of ammonia, until over 50 % of selectivity at 300 °C (Fig. 19.8a). SCR materials W03/Ce-Zr, with different Ce-Zr ratio, were associated downstream to the Pt/Ba-Al NSR catalyst. In the NSR -I- SCR combined system, the DeNOx efficiency is strongly improved. An enhancement of 24 points in NOx conversion was obtained at 300 °C for the better SCR sample (W03/Ce-Zr(2o-go)) (Fig. 19.8b) [83]. [Pg.606]

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See also in sourсe #XX -- [ Pg.324 ]



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Modeling efficiency

Modeling mixing

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