应用于微波处理正丁酸模拟废水的催化剂制备及表征

Catalyst preparation by co-precipitation-calcination process in microwave catalytic treatment of landfill leachate and its characterization

通过正交实验对镍铁铈(Ni-Fe-Ce)、镍铁钛(Ni-Fe-Ti)、镍铁锆(Ni-Fe-Zr)3组复合催化剂的共沉淀-焙烧法制备工艺进行优化,并对优选出的催化剂进行SEM和XRD表征。结果表明,镍铁锆催化剂是最优催化剂,最佳制备条件为Ni∶Fe(摩尔比)0∶10、Zr∶Fe(摩尔比)4∶1、干燥时间6 h、焙烧温度350℃、焙烧时间6 h、沉淀时间5 h;此条件下制备的Fe-Zr催化剂的催化效能最高,TOC去除率达到75%;Zr的掺和改变了Fe催化剂的物相,进而提高了Fe催化剂的催化活性。

The catalysts of Ni-Fe-Ce,Ni-Fe-Ti and Ni-Fe-Zr were prepared by the method of co-precipitation-calcination.The preparation process was optimized with orthogonal experiments and the preferred was characterized by scanning electron microscope（SEM） and X-ray diffraction（XRD）.Results indicated that the catalytic performance of Ni-Fe-Zr was the best and the 75% TOC removal rate could be achieved under the optimizing preparation conditions of Ni∶Fe molar ratio of 0∶10,Zr∶Fe molar ratio of 4∶1,the calcination temperature of 350 ℃,both the drying time and the calcination time 6 h and precipitation time 5 h.Characterization results by XRD and SEM showed that the addition of Zr modified the phase of the Fe catalyst and the catalytic efficiency of Fe was improved therefor.