焙烧温度对催化剂Cu-Ni-Ce/SiO2性能的影响  

Effect of calcination temperature on catalytic activity of Cu-Ni-Ce/SiO_2 catalyst

作　　者：赵彬侠[1] 张小里[1] 王进[2] 曹昕[1] 王光磊[1] 

机构地区：[1]西北大学化工学院,西安710069 [2]西安石油大学化学化工学院,西安710065

出　　处：《环境科学学报》2008年第11期2305-2310,共6页Acta Scientiae Circumstantiae

基　　金：陕西省教育厅专项科研计划项目(No.04JK235);陕西省自然科学基金资助项目(No.2004B28)~~

摘　　要：采用浸渍法在不同焙烧温度下制备了用于湿式H2O2降解吡虫啉农药废水的Cu-Ni-Ce/SiO2催化剂,利用TG、BET、XRD和XPS等对其进行了表征,研究了焙烧温度对催化剂表面结构的影响以及催化剂表面结构与活性及稳定性之间的关系.结果表明:降低焙烧温度,Cu、Ni、Ce之间的相互作用使得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.湿式H2O2降解吡虫啉农药废水时,600℃下焙烧获得的Cu-Ni-Ce/SiO2催化剂活性最高;在催化剂用量10g.L-1、反应温度为110℃、双氧水用量为理论需用量、进水pH为9.0、反应时间为60min的条件下,COD去除率为91.5%,活性组分溶出量较小.研究结果表明,焙烧温度对CuO、NiO、CeO2及Cu、Ni固溶体之间的相互作用有较大影响,从而影响了催化剂湿式降解吡虫啉农药废水的活性和稳定性.Cu-Ni-Ce/SiO2 catalysts were prepared at different calcination temperatures 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 TG,BET,XRD and XPS.The relationships between the surface structure and catalytic activity and stability and the effect of calcination temperature（600,700 and 800℃）on catalytic activity and stability were studied.For the Cu-Ni-Ce/SiO2 catalysts,an increase in the specific surface area and a decrease in particle size were obtained at lower calcination temperatures.Higher content of Cu-Ni oxide solid solution＇ and chemisorbed oxygen were present on the surface of Cu-Ni-Ce/SiO2 catalyst when the calcination temperature was low.In CWPO of pesticide wastewater from imidacloprid production,the activity of catalyst was the highest for the catalyst calcined at 600℃.By using the Cu-Ni-Ce/SiO2 catalyst,about 91.5% CODCr removal was attained at a catalyst loading of 10 g·L^-1,a temperature of 110℃,influent pH 9,and reaction time of 60 min using the theoretical dosage of hydrogen peroxide.The concentration of leached Cu and Ni of catalyst was low.The strong interaction between CuO and NiO,CeO2,copper-nickel solid solutions is closely related to the calcination temperature and affects the activity and stability of the Cu-Ni-Ce/SiO2 catalyst in CWPO.

关 键 词：湿式过氧化氢氧化 农药废水 焙烧温度 催化剂 

分 类 号：O643.32[理学—物理化学]