Study on the treatment of ammonia solutions over Cu/La/Ce catalyst supported on ceramic powder

• Main Authors: Chun-Yang Chen, 陳俊揚
• Other Authors: Jie-Chung Lou
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/03998363117881629973

碩士 === 國立中山大學 === 環境工程研究所 === 91 === Abstract The purpose of this study was to investigate the removal performance in oxidation of ammonia solution, synthesized concentration in range of 200 mg/l -1000 mg/l, in continuous WAO process over Cu/La/Ce catalyst. The operation parameters in WAO process were performed as follows: reaction temperature, influent velocity, initial concentration of ammonia and oxygen pressure. During the first stage WAO test, ammonia conversion only reached to 40.1% under the conditions performed as follows: initial concentration of ammonia in 400 mg/l, 12 of pH, 453 K of temperature, 3.0 MPa of total pressure and 3.0 ml/min of influent velocity. In the second stage experiments conducted by 453 K, pH 12, 3.0MPa and 400 mg/l, the ammonia conversion was above 86.2% over catalyst in WAO process. In addition, the conversion of ammonia were found to be 89%, 82.6%, 81.6% and 79.3% when the initial concentration were regulated in 200, 400, 800 and 1000 mg/l respectively; 91.4% conversion of ammonia could be obtained when temperature was raised at 473 K. The tests such as XRD, SEM, EDS, ICP-MS and EA were also determined. The kinetics of WAO over Cu/La/Ce catalyst in oxidation of ammonia solutions using Power-Rate Law was presented to calculate the apparent reaction order and activated energy.