Abstract
The viability of hybrid systems conformed by a combination of Pt–Ba/Al2O3 NSR and Cu-ZSM-5 SCR catalysts is studied with both catalysts over monolithic structures in order to maximize the removal of NOx from lean-burn engines exhaust gases. To optimize performance of these coupled NSR-SCR systems, the NSR catalyst has to work under operational conditions completely different from those optimal when the NSR-only catalyst works, as in the coupled system the intermediate production of ammonia needs to be apparently increased, and then adsorbed in the SCR catalyst (Cu-ZSM-5) which is placed downstream in order to complete elimination of remaining NOx (NO+NO2) selectively to N2 with minimal amounts of other nitrogen derivates, i.e. N2O and NH3. The suitable control of operational conditions, specifically H2 concentration and duration of the rich period, allows establishing the optimal working conditions of the NSR-SCR double system in the practical application, which resulted in temperature around 200 °C and H2 concentration in excess (3–4 %).
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