HPA/Bi_2WO_6光催化剂的制备及其脱氮性能研究  

Preparation of HPA /Bi_2WO_6 and its photocatalytic properties for denitrification

作　　者：陈颖[1] 邢宸 姬生伦[1] 梁宏宝[2] 

机构地区：[1]东北石油大学石油与天然气加工省重点实验室,黑龙江大庆163318 [2]东北石油大学机械科学与工程学院,黑龙江大庆163318

出　　处：《燃料化学学报》2014年第8期971-978,共8页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(50476091)

摘　　要：以Na2WO4·2H2O和Bi(NO3)3·5H2O为原料,通过不同表面活性剂为模板剂对所制备催化剂的形貌进行调控,将调控形貌后的催化剂固载不同种类杂多酸(HPA),再进行超临界流体干燥制得HPA/Bi2WO6光催化剂。并采用X射线衍射(XRD)、紫外-可见漫反射(UV-vis)、扫描电镜(SEM)、比表面积测定仪(BET)对所制备的催化剂进行表征,通过含氮模拟油对固载杂多酸后的催化剂的脱氮性能进行评价。结果表明,十二烷基硫酸钠(SDS)能起到更好的模板导向作用,从而获得由二维纳米片组装成的三维中空花状结构。采用超临界流体萃取干燥技术对催化剂进行提纯干燥,可有效地避免孔塌陷、团聚等现象,进一步增大了催化剂的比表面积,其脱氮效果有了进一步的提高。固载磷钨酸能有效地提高催化剂的表面酸性位点,从而显著提高了催化剂的催化活性,磷钨酸固载量为10%、剂油比为1∶100时、氙灯光照3 h脱氮率可达92.08%。The HPA / Bi2WO6 was prepared with Na2WO4·2H2O, Bi（NO3 ）3·5H2O and different surfactanttemplates. The prepared sample was dried by the supercritical fluid drying （SCFD） method. It was characterizedwith XRD, FT-IR and SEM techniques and N2 sorption experiment. Its photocatalytic properties were evaluatedwith denitrification of nitrogen-containing simulated oil as model reaction. It was shown that the sodium dodecylsulfate （SDS） should be chosen as template. With this template, a highly dispersed, crystalline and activephotocatalyst was obtained. This catalyst had a larger specific surface area. The SCFD method effectivelydecreased pore collapse and particles agglomeration degree, consequently increasing the specific surface area andimproving the catalytic performance. Immobilization of H3PW12O40 on Bi2WO6 increased the surface acid sites, and hence the photocatalytic activity. When the H3PW12 O40 loading was 10% , about 92. 08% of nitrogen insimulated oil were removed by shining for 3 h with a xenon lamp at the mcatalysts / msimulated oil ratio of 1：100.

关 键 词：杂多酸 钨酸铋 光催化 超临界流体干燥 脱氮 

分 类 号：O63[理学—高分子化学]