CeO2添加量对催化剂Cu-Ni-Ce／SiO2性能的影响

Effect of Doped CeO_2 Loading on Catalytic Activity of Cu-Ni-Ce/SiO_2 Catalyst

采用浸渍法在不同Ce掺杂量时制备了用于湿式H2O2降解吡虫啉农药废水的Cu-Ni-Ce/SiO2催化剂,利用BET、SEM、XRD和XPS等对其进行了表征,并研究了Ce掺杂量对催化剂表面形态的影响以及催化剂表面形态与活性及稳定性之间的关系。结果表明:适量添加Ce后,催化剂晶粒尺寸减小,比表面积增加,Cu、Ni固溶体量和催化剂表面化学吸附氧量增加,而且活性组分的分散性增加.湿式H2O2降解吡虫啉农药废水时,在催化剂用量10 g/L、反应温度110℃、双氧水用量为理论需用量、进水pH为9.0、反应60 min条件下,0.16%Ce掺杂量的Cu-Ni-Ce/SiO2的催化剂的活性比相同工艺条件的无Ce添加的催化剂活性提高了7.2%,活性组分溶出量也大为减少.

Cu-Ni-Ce/SiO2 catalysts were prepared at different doped CeO2 loading by the impregnation method, and applied to the treatment of pesticide wastewater from imidacloprid production by catalytic wet hydrogen peroxide oxidation（CWPO）. The catalysts were characterized by means of BET, SEM, XRD, XPS. The relationships between the surface structure and catalytic activity and stability, and the effect of doped CeO2 loading on catalytic activity and stability were researched. The results showed that for the Cu-Ni-Ce/SiO2 catalysts, the increase in the specific surface area, the decrease in the particle size and the better dispersion of Cu and Ni were obtained with the suitable doped CeO2 loading. The highest content of Cu-Ni oxide solid solution＇and the chemisorbed oxygen were present in the surface of Cu-Ni-Ce/SiO2 catalyst at 0.16% doped CeO2 loading. In CWPO of pesticide wastewater from imidacloprid production, the activity of catalyst was the highest when the catalyst was doped with 0.16% of CeO2. By using the Cu-Ni-Ce/SiO2 doped with of 0.16% CeO2 catalyst, about 89.0% CODcr removal was attained at catalyst loading of 10 g/L, temperature of 110℃, dosage of hydrogen peroxide of theoretic amount and pH of 9 influent for 60 min. The concentration of leached Cu and Ni of catalyst was lower.