Morphology-Sensitive Sulfation Effect on Ceria Catalysts for NH3-SCR

被引：28
|
作者：
Tan, Wei [1 ,2 ]
Wang, Jiaming [1 ]
Yu, Shuohan [1 ]
Liu, Annai [1 ]
Li, Lulu [1 ]
Guo, Kai [1 ]
Luo, Yidan [1 ]
Xie, Shaohua [2 ]
Gao, Fei [1 ]
Liu, Fudong [2 ]
Dong, Lin [1 ]
机构：
[1] Nanjing Univ, Ctr Modern Anal, Key Lab Mesoscop Chem,Sch Chem & Chem Engn, MOE,Jiangsu Key Lab Vehicle Emiss Control,Sch Env, Nanjing 210093, Peoples R China
[2] Univ Cent Florida, Dept Civil Environm & Construct Engn, Catalysis Cluster Renewable Energy & Chem Transfo, NanoSci Technol Ctr NSTC, Orlando, FL 32816 USA
来源：
TOPICS IN CATALYSIS | 2020年 / 63卷 / 9-10期
基金：
中国国家自然科学基金;
关键词：
Gas-phase sulfation; CeO(2)nanocubes; CeO(2)nanorods; Deactivation; CEO2; SURFACES; IN-SITU; REDUCTION; SO2; XPS; NO; PERFORMANCE; MECHANISM; MODEL; ADSORPTION;
D O I：
10.1007/s11244-020-01342-8
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
In this work, sulfation effect on NH3-SCR performance over CeO(2)with different morphology (nanocubes and nanorods) was carefully studied. A morphology-sensitive sulfation effect on NH3-SCR activity was observed on CeO2. Interestingly, the NO removal efficiencies of CeO(2)nanocubes and CeO(2)nanorods got greatly enhanced after the sulfation at low-temperature range (< 350 degrees C). CeO(2)nanorods exhibited a much higher NH3-SCR activity than that of CeO(2)cubes. However, compared to CeO(2)nanocubes, CeO(2)nanorods suffered from a severe deactivation when sulfated at higher temperatures (> 350 degrees C). A series of characterizations such as N(2)adsorption-desorption, XRD, HR-TEM, TG-DTA, Raman and in situ DRIFTS of SO2 + O(2)adsorption were conducted to investigate the interactions between SO(2)and nano-shaped CeO2. It was revealed that the morphology of CeO(2)nanorods was damaged severely when sulfated at high temperature (> 350 degrees C), while the structure of CeO(2)nanocubes was relatively stable under the same condition. Furthermore, more sulfate species were found on CeO(2)nanorods than on CeO(2)nanocubes, in particular of bulk like sulfate species. As a result, the NO removal efficiency of CeO(2)nanorods declined greatly when sulfated at high temperature.
引用
收藏
页码：932 / 943
页数：12
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