The Opportunities and Challenges for NH3 Oxidation with 100% Conversion and Selectivity

The selective catalytic oxidation of ammonia (SCO) to N2 seems to be the most promising technology to remove NH3. 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 NH3-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 NH3-SCO should be given the 100% N2 selectivity and higher NH3 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 NH3 conversion, N2 selectivity and hydrothermal durability at low temperatures.