Highly efficient NO direct decomposition over BaMnO3-CeO2 composite catalysts

Developing high-performance catalyst is of paramount importance for NO direct decomposition. Here, composite catalysts BaMnO 3 -CeO 2 were designed and prepared by the one-pot method, which show high catalytic activity, oxygen resistance and durability. The NO conversion to N 2 of 85.9% at 800 °C is achieved over 5%BaMnO 3 -CeO 2 . It exhibits 66.5% activity in the presence of 10 vol% O 2 and runs stable for more than 200 h in 5 vol% O 2 at 800 °C. The high performance is originated from the strong interaction between BaMnO 3 and CeO 2 components, where CeO 2 can effectively inhibit the sintering of BaMnO 3 particles, enhance the redox activity, mobility of lattice oxygen and NO sorption. The proposed catalytic mechanism based on diffuse reflectance infrared Fourier transform spectroscopy and kinetic study reveals that the formation of N 2 O* intermediate species is the rate determining step. BaMnO 3 -CeO 2 composite can be a promising catalyst candidate for NO direct decomposition. • The BaMnO 3 -CeO 2 catalysts were prepared by the one-pot method for NO decomposition. • 5%BaMnO 3 -CeO 2 catalyst shows NO conversion to N 2 of 85.9% at 800 °C. • It exhibits 66.5% activity in 10% O2 and is stable for 200 h in 5% O2 at 800 °C. • Strong interaction between two components is crucial for the high performance.