Oxidative Degradation of Lurgi Coal-Gasification Wastewater with Mn2O3, Co2O3, and CuO Catalysts in Supercritical Water

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• 作者：Yuzhen Wang ; Shuzhong Wang ; Yang Guo ; Donghai Xu ; Yanmeng Gong ; Xinying Tang ; Honghe Ma
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：December 26, 2012
• 年：2012
• 卷：51
• 期：51
• 页码：16573-16579
• 全文大小：360K
• 年卷期：v.51,no.51(December 26, 2012)
• ISSN：1520-5045

文摘

Lurgi coal-gasification wastewater was degraded in supercritical water using Mn₂O₃, Co₂O₃, and CuO as catalysts. The experiments were performed in a batch reactor at temperatures of 380鈥?60 掳C and oxygen ratios of 1.5鈥?.5. The results involved evaluation of TOC and NH₃鈥揘 removal efficiencies; detection of the main products in the effluent; XRD, SEM, and BET analyses of the catalysts; and detection of metal ions leached from the catalysts. Maximum TOC and NH₃鈥揘 removals were found with Co₂O₃ catalyst at 460 掳C and OR = 3.5. The effluent quality could meet class-I criteria of the Integrated Wastewater Discharge Standard (GB 8978-1996). The catalytic effects on pollutant removal were in the order Co₂O₃ > Mn₂O₃ > CuO. The major phase of Mn₂O₃ transformed into MnO₂ with a decreasing BET surface area at 460 掳C and an oxygen ratio of 3.5. Serious Cu-ion leaching occurred during the process and intensified with increasing temperature.