"Fast SCR" reaction over Sm-modified MnOx-TiO2 for promoting reduction of NOx with NH3

被引：154
作者：
Gao, Chen [1 ]
Shi, Jian-Wen [1 ]
Fan, Zhaoyang [1 ]
Wang, Baorui [1 ]
Wang, Yao [1 ]
He, Chi [2 ]
Wang, Xinbo [1 ]
Li, Jun [1 ]
Niu, Chunming [1 ]
机构：
[1] Xi An Jiao Tong Univ, Ctr Nanomat Renewable Energy, State Key Lab Elect Insulat & Power Equipment, Sch Elect Engn, Xian 710049, Shaanxi, Peoples R China
[2] Xi An Jiao Tong Univ, Dept Environm Sci & Engn, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China
来源：
APPLIED CATALYSIS A-GENERAL | 2018年 / 564卷
关键词：
Selective catalytic reduction; MnOx; Fast SCR; Reaction mechanism; de-NOx; SELECTIVE CATALYTIC-REDUCTION; LOW-TEMPERATURE; MANGANESE OXIDES; REACTION-MECHANISM; CARBON NANOTUBES; MNOX CATALYSTS; SO2; TOLERANCE; MIXED OXIDES; NH3-SCR; OXIDATION;
D O I：
10.1016/j.apcata.2018.07.017
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：
A series of Sm-modified MnOx-TiO2 (SMT) catalysts are prepared and characterized. The results show that the introduction of Sm can effectively restrain the crystallization process of MnOx and TiO2, enhance the specific surface area, increase the surface concentration of chemisorbed oxygen species and the amount of strong surface acid sites, and reduce the surface concentration of Mn4+. The catalytic performances of the SMT catalysts are evaluated by the selective catalytic reduction (SCR) of NOx with NH3. It is found that SMT-0.3 catalyst (a 0.3 mol rate of Sm/Mn) exhibits a 100% N-x conversion in a wide operating temperature window from 180 to 390 degrees C, and a 100% N-2 selectivity from 120 to 390 degrees C under a GHSV of 36,000 h(-1), which is obviously better than MnOx TiO2 without Sm addition. In-situ DRIFT spectra reveal that, at low temperature (below 200 degrees C), absorbed NH3 species can react with gas-phase NO over MnOx-TiO2 catalyst following Eley-Rideal (E-R) mechanism, while the NH3-SCR of NO over SMT-0.3 follows both E-R and Langmuir-Hinshelwood (L-H) mechanisms. However, at high temperature (above 200 degrees C), the SCR reaction over MnOx-TiO2 is via "standard SCR" process, but the SCR reaction over SMT-0.3 is through "fast SCR" reaction.
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页码：102 / 112
页数：11
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