Enhanced low-temperature NH3-SCR performance of CeTiOx catalyst via surface Mo modification

被引：53
作者：
Li, Lulu [1 ,3 ]
Li, Peixiao [4 ]
Tan, Wei [2 ]
Ma, Kaili [2 ]
Zou, Weixin [2 ]
Tang, Changjin [2 ,3 ]
Dong, Lin [1 ,3 ]
机构：
[1] Nanjing Univ, Sch Environm, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Sch Chem & Chem Engn, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Ctr Modern Anal, Cliangsu Key Lab Vehicle Emiss Control, Nanjing 210093, Jiangsu, Peoples R China
[4] Emergency Ctr Environm Monitoring, Middle Route South To North Water Transfer Projec, Nanyang 473061, Henan, Peoples R China
来源：
CHINESE JOURNAL OF CATALYSIS | 2020年 / 41卷 / 02期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
DeNO(x); CeO2-TiO2; catalyst; MoO3; modification; SO2; poisoning; Surface acidity; MIXED-OXIDE CATALYST; CEO2/TIO2; CATALYST; ACTIVE-SITES; REACTION-MECHANISM; DOPED CEO2/TIO2; REDUCTION; NOX; NH3; SCR; RESISTANCE;
D O I：
10.1016/S1872-2067(19)63437-6
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The effect of molybdenum oxide on the activity and durability of CeO2-TiO2 catalyst for NO reduction by NH3 was examined. It was found that the introduction of Mo could improve the low-temperature NH3-SCR activity and SO2/H2O durability of the CeO2-TiO2 catalyst and an optimal loading of Mo was 4 wt.%. The best MoO3/CeO2-TiO2 catalyst displayed over 90% NO conversion from 200 degrees C to 400 degrees C and obtained 4 -fold increase in NO conversion compared to CeO2-TiO2 at 150 degrees C. The characterization results revealed that the number of Bronsted acid sites over MoO3/CeO2-TiO2 was significantly increased, and the adsorption of nitrate species was dramatically weakened because of the coverage of MoO3, which were favorable for the high NH3-SCR performance. It is believed that the MoO3/CeO2-TiO2 catalyst is a suitable substitute for the NH3-SCR reaction. (C) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：364 / 373
页数：10
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