Selective wet air oxidation of diluted aqueous ammonia solutions over co-precipitated transition metal-aluminium catalysts |
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Authors: | Sutasinee Kaewpuang-Ngam Koji Inazu Ken-Ichi Aika |
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Institution: | (1) Dipartimento di Chimica Industriale ed Ingegneria Chimica Giulio Natta, Politecnico di Milano, P.zza L. da Vinci 32, 20133 Milano, Italy |
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Abstract: | Catalytic wet air oxidation of ammonia over a co-precipitated transition metal-aluminium catalyst was investigated. Copper-aluminium (Cu-Al-O) catalyst exhibited the highest activity and N2 selectivity among those prepared from Co, Fe, Mn, and Ni. 50% of 1500 ppm of ammonia could be removed from wastewater of pH 12 at 503 K under 2.0 MPa of air by using 4.0 g of catalyst without formation of toxic nitrogen containing compounds. Cu and Al ions were not found in solution after the reaction. It has been found that the catalytic performance of Cu-Al-O catalyst was strongly dependent on the preparation methods. The co-precipitated Cu-Al-O catalysts showed high N2 selectivity. The presence of CuO is concluded to promote the reaction and CuAl2O4 in bulk phase is needed to stabilize the catalyst. |
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