Modulate the superficial structure of La2Ce2O7 catalyst with anchoring CuO species for the selective catalytic oxidation of NH3

• The abundant intrinsic defects in La 2 Ce 2 O 7 pyrochlore are beneficial to NH 3 -SCO reaction. • Electrostatic adsorption improves the dispersion and stability of anchoring cuo x species. • The mass-transfer efficiency of surface free o is promoted by the [Ce-O-Cu] connection. • The anchoring cuo x species enhance the low-temperature activity of La 2 Ce 2 O 7 catalytic. Air contamination caused by the ammonia slip phenomenon has gradually captured the researcher's extensive attention. An effective strategy for controlling fugitive NH 3 is critical to improving the air quality and living environment. In the present work, CuO x /La 2 Ce 2 O 7 composite as a potential candidate catalyst is synthesized through the electrostatic adsorption method for the selective catalytic oxidation (SCO) of NH 3 to N 2 . The 5% CuO x /La 2 Ce 2 O 7 exhibits the best catalytic activity ( T 90 =243 ℃) and ammonia conversion efficiency. The improvement of performance is mainly attributed to the superficial connection of [Ce-O-Cu], which enhances the capturing ability of ammonia molecule and accelerates the dissociating efficiency of N H bonding for N 2 evolution, simultaneously. This work provides a facile method to synthesis pyrochlore-like composite catalyst of NH 3 -SCO for solving the problem of ammonia slip pollution in the future.