Citation: Jiawei Ji, Li Han, Wang Song, Jingfang Sun, Weixin Zou, Changjin Tang, Lin Dong. Promotion effect of bulk sulfates over CeO₂ for selective catalytic reduction of NO by NH₃ at high temperatures[J]. Chinese Chemical Letters, ;2023, 34(5): 107769. doi: 10.1016/j.cclet.2022.107769 shu

Promotion effect of bulk sulfates over CeO₂ for selective catalytic reduction of NO by NH₃ at high temperatures

Jiawei Ji ^a ,
Li Han ^a ,
Wang Song ^a ,
Jingfang Sun ^d ,
Weixin Zou ^{b, *,} ,
Changjin Tang ^{c, *,} ,
Lin Dong ^{a, b, d}

a.
Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
b.
School of the Environment, Nanjing University, Nanjing 210023, China
c.
School of Environment, Nanjing Normal University, Nanjing 210023, China
d.
Jiangsu Key Laboratory of Vehicle Emission Control, Center of Modern Analysis, Nanjing University, Nanjing 210023, China

wxzou2016@nju.edu.cn

tangcj@njnu.edu.cn

Received Date: 16 May 2022
Revised Date: 4 August 2022
Accepted Date: 21 August 2022
Available Online: 23 August 2022

Figures(4)

Understanding the influence of sulfates over catalysts for selective catalytic reduction of NO with NH₃ (NH₃-SCR) is crucial due to the universal presence of SO₂ in exhaust gas. Depending on the degree of sulfation, there mainly exist surface and bulk sulfates and NH₃-SCR activity is generally considered to suffer more from bulk sulfates. Herein, the unique function of bulk sulfates over CeO₂ in promoting high-temperature SCR reaction is revealed. Notably, compared with CeO₂ dominated with surface sulfates (S-CeO₂–4h) and commercial V₂O₅-WO₃/TiO₂, CeO₂ with bulk sulfates (S-CeO₂–72h) exhibits admirable NO conversion at the temperature range of 400–550 ℃. Bulk sulfates provide more Brønsted acid sites with stronger strength for NH₃ adsorption. Moreover, the oxidation ability of CeO₂ is significantly inhibited due to electron-withdrawing effect from bulk sulfates, which alleviates NH₃ oxidation at high temperatures. More NH₃ adsorption with high stability and limited NH₃ oxidation capacity ensure the excellent catalytic performance for S-CeO₂–72h in high-temperature denitration. This work provides new insight of bulk sulfates in promoting SCR activity and open a new avenue to design deNO_x catalysts employed at high temperatures.
- NH₃-SCR,
- CeO₂,
- Bulk sulfates,
- High temperature denitration,
- NH₃ adsorption,
- NH₃ oxidation
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Promotion effect of bulk sulfates over CeO2 for selective catalytic reduction of NO by NH3 at high temperatures

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Promotion effect of bulk sulfates over CeO₂ for selective catalytic reduction of NO by NH₃ at high temperatures