Pt-CeO2/TiO2催化剂催化湿式氧化苯酚废水的研究

摘要

Pt/TiO2,Pt-CeO2/TiO2,Pt-ZrO2/TiO2,Pt-La2O3/TiO2,Pt-Pr2O3/TiO2 and Pt-SnO2/TiO2 catalysts were prepared by the impregnation method,and their catalytic activities were studied through catalytic wet air oxidation experiments of high-concentration phenol wastewater. The results show that the catalytic activity of Pt-CeO2/TiO2 is the highest among those catalysts;under the conditions of reaction time 2 h,160 ℃ and 2.25 MPa, the removal rates of phenol and COD are about 87.53% and 72.06% , respectively. When the content of CeO2 is 12.5%, the Pt-CeO2/TiO2 catalyst has the highest catalytic activity. XRD and TEM results show that the CeO2 additive can reduce the size of Pt and improve the dispersion of Pt.%　　以TiO2为载体,利用分步浸渍法制备了Pt-CeO2/TiO2、Pt-ZrO2/TiO2、Pt-La2O3/TiO2、Pt-Pr2O3/TiO2和Pt-SnO2/TiO2催化剂,并催化湿式氧化高浓度苯酚废水.Pt-CeO2/TiO2催化剂的活性最好,在反应温度为160℃、氧分压为2.25 MPa,反应时间为2 h的条件下,苯酚和COD的去除率分别为87.53%和72.06%.进一步研究助剂含量对催化剂性能的影响,当 CeO2负载量为12.5%时,催化剂 Pt-CeO2/TiO2的催化性能最佳.XRD 和TEM结果表明,助剂CeO2的引入起到降低Pt的粒径,提高Pt在载体表面的分散度的作用.