PD/LAXSR1XFEO3 PEROVSKITE NANOCATALYSTS FOR SELECTIVE CATALYTIC REDUCTION OF NOX BY HYDROGEN

Abstract. In this study, LaxSr1􀀀xFeO3 (x = 0, 0.8) perovskite-type catalysts were prepared by gel combustion method and then 1.0 wt% palladium was loaded on them by a dry impregnation. The catalysts were characterized by XRD, SEM, H2-TPR, O2- TPD, NO-TPD, and BET surface area techniques. H2-TPR proles of the Pd/perovskite catalyst show reduction of Pd at around 140C which facilitates the reduction of NO in H2-SCR. TPD results reveal that substitution of Sr in the perovskites structure remarkably decreases the oxygen mobility and increases the NO adsorption. The H2-SCR of NO on the catalysts was performed in a temperature-programmed reaction apparatus in the presence of oxygen. The eect of carbon monoxide in the feed on H2-SCR was also investigated. The PLSFO catalyst (1.0 wt% Pd/La0:8Sr0:2FeO3) shows the highest NO conversion and N2 selectivity at a moderate temperature of 190 C.