30-P-06-Effect of the reductant nature on the catalytic removal of N2O on a Fe-zeolite-beta catalyst

Publisher Summary This chapter presents the effect of the reductant nature on the catalytic removal of nitrous oxide (N2O) on an iron (Fe)-zeolite-beta catalyst. A Fe(97)-BEA catalyst, prepared by conventional ion-exchange procedure and calcined at 773 K, almost contains iron-binuclear-oxo-species in charge compensation of the BEA structure. The re-oxidation of iron (II) species by N2O leads to new oxo-species reducible at lower temperature than the dimer species. Among hydrogen (H2), carbon monoxide (CO), propene, and ammonia (NH3) in the reduction of N2O, CO, propene, and NH3 are selective reductants. For these three reductants, a similar light-off temperature of ca 638 K is obtained in the selective catalytic reduction of N2O. CO is efficient from 473 K, but its activity is limited by the reoxidation of Fe II to Fe III species by N2O.