Emission of NH3 and N2O during NO reduction over commercial aged three-way catalyst (TWC): Role of individual reductants in simulated exhausts

Assessing the effect of O2 dithering on CH4 oxidation on Pd/Al2O3

“…6 shows that N 2 O was detected in the online FTIR spectrometer when CH 4 oxidation by O 2 proceeded and NO conversion was low (≤415 • C). N 2 O is known to be formed under oxidizing conditions from NO and CO via the surface isocyanate intermediate [36,37]. Under the conditions in which H 2 formed and was detected by MS, N 2 O was replaced by NH 3 arising from the reaction between NO and H 2 [5,37].…”

“…N 2 O is known to be formed under oxidizing conditions from NO and CO via the surface isocyanate intermediate [36,37]. Under the conditions in which H 2 formed and was detected by MS, N 2 O was replaced by NH 3 arising from the reaction between NO and H 2 [5,37]. When CH 4 -SR was promoted only in the rich phase of the pulses, both N 2 O and NH 3 were observed, because of the low time resolution of the FTIR measurement (30 s/spectrum), which did not allow to follow the concentration of the two products in a full rich or lean pulse.…”

Significant Reduction of the Formation of N2O and NH3 on an Efficient Three-Way PtRh Catalyst Modified by LaFeCu Perovskite

“…They concluded that 2NO + 2CO → N 2 + 2CO 2 occurred on the Rh cluster, indicating that the product of the Rh cluster mainly formed N 2 , thereby reducing the formation of NH 3 . The pathway of N 2 O formation during automobile exhaust treatment is complex. − Generally, N 2 O can be formed by the incomplete reduction of NO by H 2 , CO, or HC . In particular, N 2 O formation behaves quite differently over Pt, Pd, and Rh catalysts.…”