垃圾渗滤液湿式氧化催化剂Fe-Co-Pt-Ce/FSC的组分配比优化及表征  

Composition ratio optimization and characterization of Fe-Co-Pt-Ce/FSC catalyst for wet air oxidation of landfill leachate

作　　者：陈文松[1] 王壮宇 张永利[2,3] 王承智[4] 

机构地区：[1]广东工业大学环境科学与工程学院,广州510006 [2]佛山科学技术学院环境与化学工程学院,佛山528000 [3]华南理工大学化学与化工学院,广州510640 [4]环境保护部核与辐射安全中心,北京100082

出　　处：《环境化学》2017年第7期1648-1656,共9页Environmental Chemistry

基　　金：中国博士后科学基金(2014M552202);国家自然科学基金(21277051)资助~~

摘　　要：采用等量浸渍法制备不同金属组分配比的Fe-Co-Pt-Ce/FSC负载型催化剂,并用于催化湿式氧化垃圾渗滤液,以COD去除率、浊度去除率和垃圾渗滤液处理中p H值的变化评价催化剂的活性,以金属溶出浓度评价催化剂的稳定性,考察金属组分配比对催化剂活性和稳定性的影响.通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、热重-差热(TG-DTA)、孔结构、X射线衍射(XRD)和X射线光电子能谱法(XPS)表征优选催化剂的组构性能,结果表明,Fe_1Co_1Pt_1Ce_3/FSC催化剂表现出最佳的催化性能,其作用下垃圾渗滤液的COD去除率、浊度去除率和最低pH值分别为86.2%、99.9%和6.34,金属溶出浓度为2.88 mg·L^(-1);焙烧温度的提高使催化剂活性降低但是稳定性提高,适宜的焙烧温度是500℃;催化剂的比表面为240.6 m^2·g^(-1),活性组分在载体表面分布均匀,组分粒子尺寸约为8.02 nm;催化剂组分主要以FeO、CoO、Pt和CeO_2的形式存在,且催化剂的金属元素之间存在协同作用.Fe-Co-Pt-Ce/FSC supported catalysts with different metal compositions were prepared by incipient-wetness impregnation method, and used in catalytic wet air oxidation treatment of the landfill leachate. The catalytic activity of the catalysts was evaluated by the COD removal efficiency, turbidity removal rate and change of pH in the landfill leachate, and the stability of the catalysts was evaluated by metal leaching. The effects of the metal composition in the catalysts on the catalytic activity and stability were investigated, and the catalysts were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, thermo gravimetric-differential thermal analysis （TG-DTA）, X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS） to optimize the metal ratio in the catalyst. The results indicated that the Fe,Co,Pt,Ce,FSC catalyst exhibited the optimal catalytic performance. And the COD removal efficiency,turbidity removal rate and minimum pH value of the landfill leachate were 86.2%, 99.9% and 6.34, respectively. Additionally, the metal leaching concentration was 2.88 mg·L-1. The increase of calcination temperature reduces the activity of the catalyst, but the stability was improved. At the optimum calcination temperature of 500 ℃, the specific surface area of the catalyst was 240.6 m2·g-1, the active components were uniformly distributed on the carrier surface, and the particle size of the components was approximately 8.02 nm. The Fe1Co1Pt1Ce3/FSC catalyst was composed mostly of FeO, CoO, Pt and CeO2. Meanwhile, there were synergistic interactions among the metal elements of the catalyst.

关 键 词：组分配比 催化剂 催化湿式氧化 垃圾渗滤液 活性 稳定性 协同作用 

分 类 号：O643.36[理学—物理化学] X703[理学—化学]