Abstract
This work adopted aqueous solutions of ammonia for use in catalytic liquid-phase reduction in a trickle-bed reactor with a platinum-rhodium bimetallic catalyst, prepared by the co-precipitation of chloroplatinic acid (H2PtCl6) and rhodium nitrate [Rh(NO3) 3]. The experimental results demonstrated that a minimal amount of ammonia was removed from the solution by wet oxidation in the absence of any catalyst, while approximately 97.0% of the ammonia was removed by wet oxidation over the platinum-rhodium bimetallic catalyst at 230°C with an oxygen partial pressure of 2.0 MPa. The oxidation of ammonia has been studied as a function of pH, and the main reaction products were determined. A synergistic effect is manifest in the platinum-rhodium bimetallic structure, in which the material has the greatest capacity to reduce ammonia. The reaction pathway linked the oxidizing ammonia to nitric oxide, nitrogen, and water.
Original language | English |
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Pages (from-to) | 686-695 |
Number of pages | 10 |
Journal | Water Environment Research |
Volume | 82 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2010 Aug |
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Ecological Modelling
- Water Science and Technology
- Waste Management and Disposal
- Pollution