Selective catalytic reduction over size-tunable rutile TiO2 nanorod microsphere-supported CeO2 catalysts

被引：32
作者：
Cheng, Kai [1 ]
Song, Weiyu [1 ]
Cheng, Ying [1 ]
Liu, Jian [1 ]
Zhao, Zhen [1 ]
Wei, Yuechang [1 ]
机构：
[1] China Univ Petr, State Key Lab Heavy Oil Proc, 18 Fuxue Rd, Beijing 102249, Peoples R China
来源：
CATALYSIS SCIENCE & TECHNOLOGY | 2016年 / 6卷 / 12期
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
MIXED-OXIDE CATALYST; LOW-TEMPERATURE; NO REDUCTION; SUPERIOR CATALYST; CE/TIO2; CATALYST; NH3; PERFORMANCE; SCR; REACTIVITY; MECHANISM;
D O I：
10.1039/c5cy02121a
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Size-tunable 3D rutile TiO2 spheres consisting of nanorods were controllably synthesized by adjusting the precursor hydrolysis rate. CeO2 nanoparticles were supported on TiO2 to prepare a series of Ce/Ti catalysts via an incipient wetness impregnation method. Catalytic activity tests showed that the hierarchical rutile TiO2 microspheres with a size of 1 mu m containing nanorod-supported CeO2 showed excellent activity and high N-2 selectivity over a wide temperature range. The novel morphology of the TiO2 nanostructures exhibits a strong interaction with CeOx species, enhancing their dispersion. The excellent catalytic activity should be mainly attributed to the enriched surface oxygen species, abundant surface acidity and high reducibility. The presence of enriched surface oxygen vacancies could facilitate the formation of active NO2 and bidentate nitrate species, leading to remarkable SCR performances. This was confirmed by in situ DRIFTS investigations.
引用
收藏
页码：4478 / 4490
页数：13
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