Abstract
Wet air oxidation (WAO) of ammonia to dinitrogen has been investigated using various heterogeneous catalysts. Among them RuO 2/Al 2O 3 exhibited remarkable activities that at least 99% of ammonia (1500 ppm) was decomposed at 503 K under 1.5 MPa in a NaOH added water (pH of 12). The product was dinitrogen exclusively, and the quantities of NO − 3 formed were very small. The reaction proceeded rapidly in the high pH region indicating that ammonia was more reactive than ammonium ion. The activity and selectivity were found to have a relation with the oxygen affinity of the metal element. It was discussed that elements (Ru, Pd) with medium weakness of M–O bond showed the high activity and selectivity and the reason was proposed.
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