Catalysts for catalytic wet oxidation (CWO) of wastewater contaminated by organic acids were prepared by impregnation of noble metals Ru, Pd and Pt on nano TiO2 support. These catalysts were characterized by X-ray diffraction (XRD), N2 physical adsorption, H2-temperature programmed reduction(H2-TPR) and transmission electron microscope(TEM). The experimental data showed that TiO2 oxidation activity was significantly enhanced by adding 1% (mass fraction) Ru or Pt, while it was less effective by adding Pd. In the CWO of acrylic acid, Pt/TiO2 catalyst showed much higher oxidation activity than Ru/TiO2 under a mild temperature condition. Chemical oxygen demand (COD) removal reached 91.3% under the conditions of temperature 130℃ and O2 initial pressure 3.0 MPa over Pt/TiO2 catalyst. However, Ru/TiO2 catalyst had higher activity than Pt/TiO2 in the CWO of saturated organic acids, such as acetic acid and succine acid. Therefore, the component of CWO catalyst should be changed when treating wastewater with different kinds of organic acids.%以纳米TiO2为载体,采用浸渍法制备了贵金属(Ru,Pd和Pt)质量分数为1％的催化剂,利用X射线衍射(XRD)、N2物理吸附(N2 physical adsorption)、程序升温还原(H2-TPR)和透射电镜(TEM)等表征手段对催化剂进行了表征,并利用催化剂进行湿式氧化处理含有机酸的废水.结果表明,添加Ru或Pt可以有效提高TiO2的氧化活性,而 Pd对氧化活性提高不明显.在处理丙烯酸废水时,与Pt/TiO2催化剂相比,Ru/TiO2催化剂具有更高的低温氧化活性,在反应温度130℃,初始氧气压力3.0 MPa下,丙烯酸废水的化学需氧量(COD)去除率达到91.3％, 而在处理饱和有机酸废水(如乙酸和丁二酸)时,Ru/TiO2催化剂的氧化活性高于Pt/TiO2.
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