Supercritical Water Oxidation of NH3 over a MnO2/CeO2 Catalyst
| Autor: | Lixiong Li, Earnest F. Gloyna, Daniel Wade, Zhong Yi Ding |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Supercritical water oxidation
Chemistry General Chemical Engineering Inorganic chemistry General Chemistry Residence time (fluid dynamics) Heterogeneous catalysis Industrial and Manufacturing Engineering Supercritical fluid Catalysis Reaction rate Ammonia chemistry.chemical_compound Catalytic oxidation Nuclear chemistry |
| Zdroj: | Industrial & Engineering Chemistry Research. 37:1707-1716 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie9709345 |
| Popis: | Catalytic oxidation of ammonia in supercritical water (SCW) was studied using a continuous-flow, packed-bed reactor at temperatures ranging from 410 to 470 °C, a nominal pressure of 27.6 MPa, and reactor residence times of less than 1 s. The kinetics and catalyst performance of MnO2/CeO2 for oxidation of ammonia in SCW was evaluated. In this reaction environment, ammonia was predominantly converted into molecular nitrogen (N2), and the rate of ammonia conversion was enhanced by MnO2/CeO2. For example, 40% of the ammonia was converted when using the MnO2/CeO2 catalyst at a temperature of 450 °C and a reactor residence time of 0.8 s. It was reported that, without a catalyst, essentially no ammonia conversion was observed below 525 °C (Helling, R. K.; Tester, J. W. Environ. Sci. Technol. 1988, 22 (11), 1319) and 10% of the ammonia was converted at a temperature of 680 °C, a pressure of 24.6 MPa, and a reactor residence time of 10 s (Webley, P. A.; Tester, J. W.; Holgate, H. R. Ind. Eng. Chem. Res. 1991, 30 (... |
| Databáze: | OpenAIRE |
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