Selective oxidative decomposition of NH3 (or NH4+) in water to N2 was achieved with 0.5 wt%Pt/TiO2 catalyst at 433 K under 8 atm of O2 without alkalization of the solution; NH3 of 1000 ppm was exclusively converted to N2 and undesirable products, NO2− and NO3− in the solution and N2O in the gas phase were little formed.
Pd-Supported ZrO2 prepared through a hydrothermal treatment was found to be pronouncedly effective for purification of waste water containing ammonia; NH3 (1000 ppm) was exclusively converted to N2 at 433 K in the presence of O2 and undesirable NO2− and NO3− were not detected. It was further demonstrated that the Pd/ZrO2 was insoluble during the reaction and was reusable without any treatment.
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