Citation: Lulu Li, Peixiao Li, Wei Tan, Kaili Ma, Weixin Zou, Changjin Tang, Lin Dong. Enhanced low-temperature NH₃-SCR performance of CeTiO_x catalyst via surface Mo modification[J]. Chinese Journal of Catalysis, ;2020, 41(2): 364-373. doi: S1872-2067(19)63437-6 shu

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

Lulu Li ^a,c, ,
Peixiao Li ^d ,
Wei Tan ^b ,
Kaili Ma ^b ,
Weixin Zou ^b ,
Changjin Tang ^b,c ,
Lin Dong ^a,c

a School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, China;
b School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, Jiangsu, China;
c Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, Jiangsu, China;
d Emergency Center for Environmental Monitoring at Canal Head of Middle Route of South-to-North Water Transfer Project, Nanyang 473061, Henan, China

Received Date: 20 May 2019
Revised Date: 5 July 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (21773106, 21707066, 21677069, and 21806077) and the China Postdoctoral Science Foundation (2018M642206).

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℃ to 400℃ and obtained 4-fold increase in NO conversion compared to CeO₂-TiO₂ at 150℃. The characterization results revealed that the number of Brönsted 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.
- DeNO_x,
- CeO₂-TiO₂ catalyst,
- MoO₃ modification,
- SO₂ poisoning,
- Surface acidity
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Enhanced low-temperature NH₃-SCR performance of CeTiO_x catalyst via surface Mo modification