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采用共沉淀法制备了CuO/ZnO/Ce O_2、CuO/ZnO/ZrO_2和CuO/ZnO/Ce O_2-Zr O_2催化湿式空气氧化苯酚废水催化剂,并采用N_2吸附-脱附、X射线衍射(XRD)、X射线光电子能谱(XPS)、程序升温还原(TPR)、N_2O滴定和电感耦合等离子体原子发射光谱等手段对催化剂进行了表征.结果表明,CuO/ZnO/Ce O_2-Zr O_2催化剂表现出最佳的催化性能.在200℃、2 MPa空气、苯酚初始浓度500 mg·L~(-1)的条件下,COD去除率为96.5%.XRD表明Ce O_2-Zr O_2复合氧化物载体以Ce_xZr_(1-x)O_2固溶体形式存在,增加了催化材料的储放氧能力.XPS表明Ce~(3+)和Ce~(4+)在催化剂表面共同存在,协调了氧化还原过程.TPR表明催化剂的还原性对催化剂的氧化活性起到至关重要的影响.由于CuO/ZnO/Ce O_2-Zr O_2催化剂活性组分和载体间的强相互作用,处理后的水样未发现金属离子,进而有效的提高了催化剂的稳定性和避免了对水样的二次污染.
CuO / ZnO / CeO_2, CuO / ZnO / ZrO_2 and CuO / ZnO / Ce O_2-ZrO_2 catalysts were prepared by coprecipitation method to catalyze wet air oxidation of phenol wastewater. The catalysts were characterized by N 2 adsorption-desorption, X-ray diffraction , X-ray photoelectron spectroscopy (XPS), temperature programmed reduction (TPR), N 2 O titration and inductively coupled plasma atomic emission spectroscopy were used to characterize the catalysts. The results show that the CuO / ZnO / Ce O 2 -Zr O 2 catalyst exhibits The optimal catalytic performance was 96.5% COD removal efficiency at 200 ℃, air pressure 2 MPa and phenol initial concentration 500 mg · L -1 .The XRD indicated that CeO_2-ZrO_2 composite oxide supported Ce_xZr_ (1-x) O 2 solid solution, which increased the oxygen storage and storage ability of the catalytic material. XPS indicated that Ce 3+ and Ce 4+ coexisted on the catalyst surface and coordinated the redox process. Of reducibility has a crucial effect on the catalytic activity of the catalyst.Because of the strong interaction between the active component of CuO / ZnO / Ce O 2 -ZrO 2 catalyst and the support, no metal ions are found in the treated water sample, Improves the stability of the catalyst and avoids secondary contamination of the water sample.