摘要
分别采用固相扩散法、浸渍法和溶胶-凝胶法制备了三种TiO2/HZSM-5分子筛复合TiO2光催化剂,在紫外光下考察其对NOx的光催化氧化活性。利用XRD、UV-Vis表征催化剂结构,结果表明,制备方法是影响复合催化剂中TiO2结晶度的重要因素,而对TiO2的光吸收无显著影响。对NOx光催化活性评价结果显示,固相扩散法和浸渍法制备的复合光催化剂的活性明显高于P25 TiO2,其中固相扩散法制备的催化剂光催化活性最高,归因于其具有较高的TiO2结晶度和混晶效应;相比P25,复合催化剂对中间产物NO2的生成有明显的抑制作用。
TiO2/HZSM-5 photocatalysts were prepared by solid state dispersion,impregnation and sol-gel methods,respectively.The photocatalytic activity of samples for NOx oxidation was investigated under UV light irradiation.The structure of catalysts was characterized by XRD and UV-Vis.The results showed that the preparation method is a significant factor which influenced the crystallinity of TiO2 involved in hybridized photocatalysts,but has little effect on the UV light absorption of the samples.The results of photocatalytic oxidation of NOx on the samples showed that the activity of the samples prepared by solid state dispersion and impregnation methods are higher than that of pure P25 TiO2.The sample prepared by solid state dispersion method performs the highest photocatalytic activity due to its higher crystallinity and mixed phase structure.Compared with pure P25,TiO2 hybridized with HZSM-5 zeolite remarkably inhibites the yield of intermediate,NO2,formation.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第2期266-270,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(No.20807015)
教育部留学回国人员科研启动基金
教育部高校博士点基金(No.200805611055)
华南理工大学中央高校基本科研业务费专项资金(2009ZM0049)
