Improvement of sulfur and water resistance with Fe-modified S-MnCoCe/Ti/Si catalyst for low-temperature selective catalytic reduction of NO with NH3

Lu Qiu; Dengkui Li; Hanliang Li; Zhaoyong Ren; Zhenye Zhu; Feng Ouyang; Mingxin Guo

doi:10.1016/j.chemosphere.2022.134740

Improvement of sulfur and water resistance with Fe-modified S-MnCoCe/Ti/Si catalyst for low-temperature selective catalytic reduction of NO with NH₃

Chemosphere. 2022 Sep:302:134740. doi: 10.1016/j.chemosphere.2022.134740. Epub 2022 Apr 27.

Authors

Lu Qiu¹, Dengkui Li², Hanliang Li², Zhaoyong Ren², Zhenye Zhu³, Feng Ouyang⁴, Mingxin Guo⁵

Affiliations

¹ College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, PR China; State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China.
² State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China.
³ State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China. Electronic address: zhuzy@hit.edu.cn.
⁴ State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, PR China. Electronic address: ouyangfh@hit.edu.com.
⁵ Zibo Environmental Pollution Control and Prevention Center, Zibo, 255000, PR China.

PMID: 35489452
DOI: 10.1016/j.chemosphere.2022.134740

Abstract

The low-temperature SCR of NO_x by NH₃ is restricted in application since the catalysts is easily poisoned by sulfur and water. The Fe modified Mn-Co-Ce/TiO₂/SiO₂ catalysts synthesized via impregnation method and sulfating were evaluated for low-temperature NH₃-SCR in the presence of SO₂ and H₂O. The calcination temperature and loading amounts of Mn, Fe, Co and Ce were optimized. Adding of Fe into S-MnCoCe/Ti/Si played an important role in resistance to sulfur and water poisoning. The optimal calcination temperature was 380 °C and the optical mass loading of the catalyst was 10% of Mn, 10% of Fe, 1% of Co and 4% of Ce. The optimal S-MnFeCoCe/Ti/Si catalyst maintained high NO_x conversion of 93% at reaction temperature of 160 °C in the presence of 50 ppm SO₂ and 10 vol% H₂O. The catalytic activity did not continue to fall after two times of repeated used in the temperature range of 100-200 °C, indicating its excellent sulfur and water durability and stability in the presence of SO₂ and H₂O. The interaction between MnO_x and FeO_x enhanced sulfur and water durability rather than other bi-metal interactions. Furthermore, the mechanism of Fe improving resistance to SO₂ and H₂O was discussed.

Keywords: Low temperature SCR; Metal oxides; NO(x) removal; Sulfur tolerance; Water durability.

MeSH terms

Ammonia
Catalysis
Oxidation-Reduction
Silicon Dioxide
Sulfur
Temperature
Titanium*
Water*

Substances

Water
Sulfur
Silicon Dioxide
Ammonia
Titanium