Different exposed facets VOx/CeO2 catalysts for the selective catalytic reduction of NO with NH3

被引：100
作者：
Zhang, Tao [1 ,2 ]
Chang, Huazhen [1 ]
Li, Kezhi [2 ]
Peng, Yue [2 ]
Li, Xiang [2 ]
Li, Junhua [2 ]
机构：
[1] Renmin Univ China, Sch Environm & Nat Resources, Beijing 100872, Peoples R China
[2] Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2018年 / 349卷
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
CeO2; support; Facets; VOx species; NH3-SCR; Acidic property; DEFINED SURFACE PLANES; OXIDATIVE DEHYDROGENATION; CERIA NANOCRYSTALS; RAMAN-SPECTROSCOPY; CEO2; NANOCRYSTALS; OXYGEN STORAGE; AMMONIA; PERFORMANCE; ADSORPTION; MORPHOLOGY;
D O I：
10.1016/j.cej.2018.05.049
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
VOx/CeO2 catalysts, employing CeO2 nanocubes (NCs), nanorods (NRs), and nanopolyhedrons (NPs) with predominately exposed {1 0 0}, {1 1 0}, and {1 1 1} facets as the supports, were prepared by an incipient wetness impregnation method. The catalysts were used in the selective catalytic reduction (SCR) of NOx with NH3. The SCR performance showed that V-CeO2-NPs could achieve significantly higher NO conversion than V-CeO2-NCs and V-CeO2-NRs in the entire temperature range. The characterization results confirmed that the redox and acidic properties of VOx/CeO2 catalysts were closely related to the exposed facets of the CeO2 supports. The excellent SCR activity of V-CeO2-NPs should be attributed to its appropriate redox ability and abundant surface acid sites, which are associated with the predominately exposed {1 1 1} facets of CeO2-NPs.
引用
收藏
页码：184 / 191
页数：8
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