摘要
针对非均相贵重金属催化剂成本高,非均相过渡金属催化剂性能良好、成本低,但使用寿命短、易流失的特点,研制高效复合MnO2-Cu O-CeO2非均相过渡金属催化剂.采用正交实验对催化剂制备过程中的n(Cu)∶n(Mn)、Ce的摩尔分数、焙烧温度、焙烧时间进行探讨,确定最佳制备条件,并对其结构和组成通过扫描电镜分析、X射线衍射分析及热重分析进行表征.用该催化剂催化氧化模拟苯酚废水,对催化剂用量、氧化剂H2O2用量、反应温度、反应时间进行优化,确定最佳反应条件并利用其进行降解化工集装罐清洗废水的应用研究.研究表明催化剂MnO2-Cu O-CeO2的最佳制备条件为:n(Cu)∶n(Mn)=4∶6、Ce的摩尔分数为10%、焙烧温度为600,℃、焙烧时间为4,h.催化氧化法处理苯酚废水的最佳工艺参数:催化剂用量0.8,g/L、H2O2用量与COD比值为3、反应温度170,℃、反应时间1,h.化工集装罐清洗废水COD去除效果显著,COD去除率达到95%左右.
Aiming at the high cost of heterogeneous catalysts of noble metals and the short service life of heterogeneous transition metal catalysts which are easy to drain,an efficient heterogeneous transition metal catalyst was studied with MnO2-CuO-CeO2 as the active component. The effects of the molar ration of Cu-Mn,molar percentage of Ce,calcination tempera-ture and calcination time on the performance of the composite catalyst MnO2-CuO-CeO2 were explored. The optimal prepa-ration conditions were determined with orthogonal experiment and the structure and composition of the catalysts were char-acterized with scanning electron microscopy（SEM）,X-ray diffraction（XRD）and thermal analysis（TA）. The technical pa-rameters such as the dosages of oxidant（H2O2）and catalyst,reaction time and temperature were studied by treating simulated phenol wastewater. Eventually,practial research on the treatment of the cleaning wastewater of containers was carried out under the optimal technological conditions. The results showed that the optimum preparation conditions were achieved when the molar ratio of Cu-Mn was 4∶6,the molar percentage of Ce was 10%,calcination temperature 600,℃ and calcination time 4,h. The optimum treatment efficiency was achieved when the dosage of catalyst was 0.8,g/L,the molar ratio of H2O2 to COD was 3∶1,reaction time 1,h and reaction temperature 170,℃. The COD removal rate of the waste water of ten cate-gories of containers cleaning wastewater was about 95%.
出处
《天津科技大学学报》
CAS
北大核心
2015年第1期67-72,共6页
Journal of Tianjin University of Science & Technology
