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Performance of Supported Copper Catalysts for Oxidative Degradation of Phenolics in Aqueous Medium: Optimization of Reaction Conditions, Kinetics, Catalyst Stability, Characterization, and Reusability
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-06-29 , DOI: 10.1021/acs.iecr.0c02211 Rajendra Mohite 1 , Anurag Garg 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-06-29 , DOI: 10.1021/acs.iecr.0c02211 Rajendra Mohite 1 , Anurag Garg 1
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Catalytic wet oxidation (CWO) of phenolic wastewater containing phenol, o-cresol, and 2,5-dimethylphenol was carried out in a batch reactor (phenolics = 10 g/L, chemical oxygen demand (COD) = 26 000 mg/L, and total organic carbon (TOC) = 7900 mg/L). Using the Box–Behnken experimental design (BBD) approach, the following optimum CWO conditions (catalyst: 5% Cu/AC) for phenolics degradation were found: Ccat = 3.4 g/L, T = 148 °C, PO2 = 0.61 MPa, and pH = 7.4. Under these conditions, TOC and COD removals of 88 and 90%, respectively, were obtained after 4 h of reaction. p-Benzoquinone and hydroquinone were identified as major intermediates, whereas a mixture of carboxylic acids was detected in treated wastewater. At higher oxygen pressures (stoichiometric and above), mineralization of phenolics was improved although the overall degradation was lower probably due to overoxidation. Reaction kinetics, reusability of the catalysts, and detailed characterization of spent catalysts are also discussed in this paper.
中文翻译：
负载型铜催化剂在水性介质中氧化降解酚类的性能：反应条件，动力学，催化剂稳定性，表征和可重复使用性的优化
含苯酚，邻甲酚和2,5-二甲基苯酚的含酚废水的催化湿式氧化（CWO）在间歇式反应器中进行（苯酚= 10 g / L，化学需氧量（COD）= 26 000 mg / L，总有机碳（TOC）= 7900 mg / L）。使用Box–Behnken实验设计（BBD）方法，发现以下用于酚类降解的最佳CWO条件（催化剂：5％Cu / AC）：C cat = 3.4 g / L，T = 148°C，P O 2 = 0.61 MPa，pH = 7.4。在这些条件下，反应4小时后，TOC和COD的去除率分别为88％和90％。p苯醌和对苯二酚被确定为主要中间体，而在处理后的废水中发现了羧酸的混合物。在较高的氧气压力下（化学计量及以上），酚醛树脂的矿化得到了改善，尽管总体降解可能较低，这可能是由于过氧化引起的。本文还讨论了反应动力学，催化剂的可重复使用性以及废催化剂的详细表征。
更新日期：2020-07-22
中文翻译：
负载型铜催化剂在水性介质中氧化降解酚类的性能：反应条件，动力学，催化剂稳定性，表征和可重复使用性的优化
含苯酚，邻甲酚和2,5-二甲基苯酚的含酚废水的催化湿式氧化（CWO）在间歇式反应器中进行（苯酚= 10 g / L，化学需氧量（COD）= 26 000 mg / L，总有机碳（TOC）= 7900 mg / L）。使用Box–Behnken实验设计（BBD）方法，发现以下用于酚类降解的最佳CWO条件（催化剂：5％Cu / AC）：C cat = 3.4 g / L，T = 148°C，P O 2 = 0.61 MPa，pH = 7.4。在这些条件下，反应4小时后，TOC和COD的去除率分别为88％和90％。p苯醌和对苯二酚被确定为主要中间体，而在处理后的废水中发现了羧酸的混合物。在较高的氧气压力下（化学计量及以上），酚醛树脂的矿化得到了改善，尽管总体降解可能较低，这可能是由于过氧化引起的。本文还讨论了反应动力学，催化剂的可重复使用性以及废催化剂的详细表征。
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