The Opportunities and Challenges for NH 3 Oxidation with 100% Conversion and Selectivity

The selective catalytic oxidation of ammonia (SCO) to N 2 seems to be the most promising technology to remove NH 3 . Compared with electrocatalytic and photocatalytic ammonia oxidation technology, the thermal catalytic oxidation ammonia technology was sufficient to support large-scale commercial and industrial applications. The NH 3 -SCO reaction was strongly obeyed the reaction routes of imide, hydrazinium-type and iSCR mechanism. Further, in situ (electron paramagnetic resonance) EPR spectroscopy combined with DFT calculation could provide a foundation for the design and construction of highly efficient ammonia oxidation catalyst. Finally, important ideas for NH 3 -SCO should be given the 100% N 2 selectivity and higher NH 3 conversion at lowest temperature. If Ag single-atoms were inserted in the tunnels of zeolites or MOF to result in single Ag atoms anchored at the tunnel, this single-atom Ag particles exhibited super NH 3 conversion, N 2 selectivity and hydrothermal durability at low temperatures.