Synergy between FeOX and CuOX in FeCuOX/TiO2-hBN composites for NO reduction with NH3

A synergy between FeO X and CuO X was confirmed in FeCuO X /TiO 2 -hBN composites for selective catalytic reduction of NO with NH 3 . Accordingly, the reducibility of composites was modified to promote the NO to NO 2 oxidation but suppress the NH 3 to NO over oxidation, which is of benefit to the NO reduction. Also the optimal operation temperature could be controlled by tuning the Fe:Cu atomic ratio, and Fe 10 Ti 85 BN 5 , Fe 7.5 Cu 2.5 Ti 85 BN 5 and Fe 2.5 Cu 7.5 Ti 85 BN 5 achieved the best NO removal above 90% at 375   °C, 300   °C and 250   °C, respectively. From the NO 2 and NH 3 adsorption behaviors over FeCuO X /TiO 2 -hBN, the reaction followed Langmuir–Hinshelwood mechanism below 275   °C, but followed Eley–Rideal mechanism above 350   °C. The influence of SO 2 on NO removal was found to be temperature dependent, at temperature below 325   °C, slight deactivation was observed, while a promotion was achieved above 350   °C.