Effects of O2, CO2 and H2O on NOx adsorption and selective catalytic reduction over Fe/ZSM-5

▶ NOx adsorption on Fe/ZSM-5 catalyst is promoted by O2. ▶ H2O has little effect on NOx adsorption but enhances reactivity of Fe/ZSM-5. ▶ CO2 negatively impacts on NOx adsorption but little effect on reactivity of Fe/ZSM-5. ▶ O2 significantly reduces NOx conversion in Fe/ZSM-5-propylene system. ▶ SO2 seriously poisons Fe/ZSM-5 catalyst.