Preparation of amorphous MnOx/TiO2 catalyst and its performance in low temperature NH3-SCR

WANG Liang-liang; WANG Ming-hong; FEI Zhao-yang; ZHANG Zhu-xiu; CHEN Xian; TANG Ji-hai; CUI Mi-fen; QIAO Xu

Volume 45 Issue 8

Aug. 2017

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Article Navigation > Journal of Fuel Chemistry and Technology > 2017 > 45(8): 993-1000

WANG Liang-liang, WANG Ming-hong, FEI Zhao-yang, ZHANG Zhu-xiu, CHEN Xian, TANG Ji-hai, CUI Mi-fen, QIAO Xu. Preparation of amorphous MnOx/TiO2 catalyst and its performance in low temperature NH3-SCR[J]. Journal of Fuel Chemistry and Technology, 2017, 45(8): 993-1000.

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WANG Liang-liang, WANG Ming-hong, FEI Zhao-yang, ZHANG Zhu-xiu, CHEN Xian, TANG Ji-hai, CUI Mi-fen, QIAO Xu. Preparation of amorphous MnO_x/TiO₂ catalyst and its performance in low temperature NH₃-SCR[J]. Journal of Fuel Chemistry and Technology, 2017, 45(8): 993-1000.

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Preparation of amorphous MnO_x/TiO₂ catalyst and its performance in low temperature NH₃-SCR

WANG Liang-liang^{1, 2},
WANG Ming-hong^{1, 2},
FEI Zhao-yang^{1, 2
,
,},
ZHANG Zhu-xiu²,
CHEN Xian²,
TANG Ji-hai²,
CUI Mi-fen²,
QIAO Xu^{1, 2
,
,}

1.
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
2.
College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China

Funds:

the National Natural Science Foundation of China 21306089

Innovation Foundation of Jiangsu Province SJLX15-0347

Received Date: 2017-05-16
Rev Recd Date: 2017-06-26

Available Online: 2021-01-23

Publish Date: 2017-08-10

Abstract

Abstract

MnO_x/TiO₂ catalysts were prepared by spontaneous deposition, co-precipitation and impregnation methods, respectively. The structure and properties of the MnO_x/TiO₂ catalysts were studied by means of XRD, TEM, N₂ adsorption-desorption, XPS, H₂-TPR and NH₃-TPD. The activity of the catalysts in the selective catalytic reduction of NO was investigated. The results showed that the MnO_x/TiO₂(s) catalyst prepared by the spontaneous deposition method had a completely amorphous structure and a strong interaction between Mn and Ti, showed stronger redox ability than other two catalysts. In addition, the MnO_x/TiO₂(s) catalyst exhibited larger surface area, more surface acid sites, which were beneficial to NH₃ adsorption and activation, as well as the high Mn⁴⁺ and adsorbed oxygen content of catalyst surface, which could greatly enhance the activity for NO oxidation to NO₂, as a result, facilitating the "fast-SCR" reaction. Thus, a superior denitrification activity was exhibited over MnO_x/TiO₂(s) catalyst. For MnO_x/TiO₂(s) catalyst, the conversion of NO reached 92.8% at 150 ℃ and retained over 90% in the range of 150-350 ℃. Moreover, the MnO_x/TiO₂(s) catalyst also showed strong resistance to H₂O and SO₂ poisoning.
- spontaneous deposition method,
- amorphous phase,
- low-temperature selective catalytic reduction,
- H₂O/SO₂ resistance

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References(30)

References

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