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Preparation of Cu Series of Catalysts and Degradation of Organic Pollutant by CWAO Process

Author: XiaZhi
Tutor: SunXiaoJun
School: Harbin University of Science and Technology
Course: Applied Chemistry
Keywords: Wet oxidation Cu - based catalyst H-acid Molecular sieve
CLC: X703
Type: Master's thesis
Year: 2007
Downloads: 221
Quote: 4
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Wet oxidation at high temperatures (125-320 ° C), high pressure (0.5-20MPa) under the conditions of treatment of high concentration, toxic, harmful biodegradable organic industrial wastewater technology. However, due to the harsh operating conditions in the reaction, widely used for the wet oxidation technology has been limited. Catalytic wet air oxidation technology to reduce the reaction temperature and pressure, shorten the reaction time, to improve the efficiency of oxidation, therefore attracted widespread attention, which is efficient, stable catalyst for the development of catalytic wet air oxidation technology has become the research focus is the key to the wet oxidation technology applications. This paper studies the non-noble metal oxide catalysts for catalytic wet air oxidation. First prepared by impregnation method supported CuO / gamma-Al to 2 the O 3 catalyst and phenol as target pollutants cause the dissolution of Cu2, mainly acidic dissolution dissolution and reactivity. Order to reduce the problem of Cu2 dissolution in the phenol catalytic wet oxidation reaction with Cu-Zn-Al catalyst prepared by coprecipitation. And selection of the mixing ratio of Cu, Zn, Al main factors design L9 (33) orthogonal test optimization of the preparation conditions, the Cu: Zn: Al = 2:3:2 Cu-Zn-Al catalyst The best performance, run under conditions of oxygen partial pressure P = 3MPa, T = 180 ° C for 60min on phenol COD removal efficiency of 97.6%, the the Cu2 dissolution amount of 12.5 mg / L. Second, the Cu-Zn-Al catalyst for the oxygen partial pressure P = 3 MPa, T = 150 ° C under the conditions of experiment running 30min catalytic wet air oxidation of H-acid. Selection of Cu, Zn, and Al in the mixing ratio and the aging time, the firing temperature, firing time in order to obtain optimum preparation conditions in the wet oxidation reaction of H-acid catalyst, for the influencing factors, L25 (56) orthogonal experiment, and COD removal efficiency and Cu2 dissolution as the standard for factor optimization. COD removal efficiency for the degradation of H-acid, the best solution is Cu: Zn: Al = 4:2:1, the aging time was 18 hours, 12 hours of 700 ° C calcined; For Cu2 reduce the degradation of H-acid dissolution, The optimal solution is Cu: Zn: Al = 1:5:5, the aging time of 21 hours, 8 hours of 900 ° C calcination. H-acid the target pollutants continue to explore the preparation of zeolites Cu-Zn catalyst. To impregnation method got different load Cu-Zn/ZSM-5 and Cu-Zn/HY catalyst and co-precipitation method was Cu-Zn-Al catalyst at a reaction temperature of 150 ° C, the oxygen partial pressure 3MPa, the total reaction time 30min, an aqueous solution of H-acid under the conditions of stirring intensity 600r/min wet air oxidation degradation. The study results showed that: for dealing with the H-acid aqueous solution, compared with the reference CUZn-Al catalyst, the Cu-Zn catalysts Zeolites COD removal efficiency higher, which is catalytically active centers in Zeolite superior dispersion; ZSM-5 zeolite CuO loading to 3.41%, 1.16% ZnO load, HY zeolite of CuO to 4.06%, 1.38% ZnO load. Kinetic studies on Zeolites Cu-Zn catalyst for catalytic wet air oxidation of H-acid reaction with water. The results show that the catalytic wet air oxidation in line with the law of two-stage first-order reaction. Zeolites and study calculated that the activation energy of Cu-Zn catalyst activity is mainly reflected in the degradation of macromolecules into small molecules of the first stage of the reaction, and the treatment effect of the Cu-Zn catalyst ZSM-5 zeolite as the carrier is excellent HY zeolite carrier Cu-Zn catalyst.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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