Low temperature denitrification performance and reactant adsorption characteristics of MnPO/TiO<sub>2</sub> catalysts

LI Xiaohai; JIANG Dongsheng; CHENG Xianqing; LIU Xiang; DING Zhengyu; JIA Yong; LONG Hongming

doi:10.13205/j.hjgc.202511011

Volume 43 Issue 11

Nov. 2025

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LI Xiaohai, JIANG Dongsheng, CHENG Xianqing, LIU Xiang, DING Zhengyu, JIA Yong, LONG Hongming. Low temperature denitrification performance and reactant adsorption characteristics of MnPO/TiO2 catalysts[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 93-104. doi: 10.13205/j.hjgc.202511011

Citation:

LI Xiaohai, JIANG Dongsheng, CHENG Xianqing, LIU Xiang, DING Zhengyu, JIA Yong, LONG Hongming. Low temperature denitrification performance and reactant adsorption characteristics of MnPO/TiO₂ catalysts[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 93-104. doi: 10.13205/j.hjgc.202511011

Citation:

LI Xiaohai, JIANG Dongsheng, CHENG Xianqing, LIU Xiang, DING Zhengyu, JIA Yong, LONG Hongming. Low temperature denitrification performance and reactant adsorption characteristics of MnPO/TiO₂ catalysts[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(11): 93-104. doi: 10.13205/j.hjgc.202511011

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Low temperature denitrification performance and reactant adsorption characteristics of MnPO/TiO₂ catalysts

doi: 10.13205/j.hjgc.202511011

1. Datang Nanjing Environment Protection Technology Co., Ltd., Nanjing 211111, China;
2. Department of Environmental Science and Engineering, Anhui University of Technology, Maanshan 243002, China;
3. Department of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, China

Received Date: 2024-06-16
Accepted Date: 2024-07-30
Rev Recd Date: 2024-07-10

Available Online: 2026-01-09

Abstract

Abstract

In the paper， MnPO/TiO₂ catalysts was prepared by using MnO _x， which has strong electron transport capacity， excellent redox property and environmental friendliness， as the active component， and phosphoric acid was used to modulate the acidity and redox property of Mn/TiO₂catalysts， and their denitrification performance was tested， and the adsorption characteristics of reactant molecules on the surface of the catalysts were simulated by DFT method. The results showed that the highest denitrification activity occurred when the Mn/P was 2， the active component loading was 10%， and the calcination temperature was 350 ℃， and the denitrification efficiency was above 80% at 120 ℃， and above 99% at a temperature range of 150 to 210 ℃. The results of the anti-SO₂ test and characterization showed that the Mn₂P₂O₇ could effectively improve the sulfur resistance of the MnPO/TiO₂ catalysts. DFT simulation result showed that the adsorption characteristics of NH₃ and NO on the surfaces of Mn₂P₂O₇ （111） and Mn₃O₄ （110）， and the adsorption of NO on the surfaces of Mn₂P₂O₇（111） and Mn₃O₄（110） with N-terminal adsorption， were relatively stronger. The adsorption energies of SO₂ on the surfaces of Mn₂P₂O₇（111） and Mn₃O₄（110） were much larger than those of NO. SO₂ was at a disadvantage for competitive adsorption with NO on the catalyst surface. Meanwhile， the adsorption energy of SO₂ on the surface of Mn₂P₂O₇（111） was larger than that on the surface of Mn₃O₄（110）， which indicated Mn₂P₂O₇could improve the sulfur resistance of MnPO/TiO₂. The adsorption energy of the H₂O molecule on the surface of Mn₂P₂O₇（111） was -129.56 kJ/mol， and on the surface of Mn₃O₄（110） surface was -135.2 kJ/mol and -133.65 kJ/mol for Mn1 and Mn2， respectively， both of which are chemisorbed.
- MnPO,
- SCR denitrification,
- sulfur resistance,
- DFT simulation,
- adsorption characteristics

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References(39)

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