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

Air contamination caused by the ammonia slip phenomenon has gradually captured the researcher's extensive attention. An effective strategy for controlling fugitive NH3 is critical to improving the air quality and living environment. In the present work, CuOx/La2Ce2O7 composite as a potential candidate catalyst is synthesized through the electrostatic adsorption method for the selective catalytic oxidation (SCO) of NH3 to N-2. The 5% CuOx/La2Ce2O7 exhibits the best catalytic activity (T-90 =243 degrees C) 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 NH3-SCO for solving the problem of ammonia slip pollution in the future. (C) 2021 Published by Elsevier Ltd on behalf of Chinese Society for Metals.

Automated summary

Air contamination caused by ammonia slip has gained significant attention from researchers. Controlling fugitive ammonia is crucial for improving air quality. In this study, a CuOx/La2Ce2O7 composite catalyst was synthesized through electrostatic adsorption and showed excellent catalytic activity and ammonia conversion efficiency. The catalyst's performance improvement is attributed to the enhanced capturing ability of ammonia molecules and accelerated dissociation of N-H bonds. This work provides a facile method for synthesizing a pyrochlore-like composite catalyst for NH3-SCO, which can help solve the problem of ammonia slip pollution in the future.