Pd/LaxSr1xFeO3 perovskite nanocatalysts for selective catalytic reduction of NOx by hydrogen

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 profiles of the pd/perovskite catalyst show reduction of pd at around 140°c 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 effect of carbon monoxide in the feed on h2-scr was also investigated. the plsfo catalyst (1.0 wt% pd/la_0:8sr_0:2feo3) shows the highest no conversion and n2 selectivity at a moderate temperature of 190 °c.