Citation: 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. shu

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-xiu ² ,
CHEN Xian ² ,
TANG Ji-hai ² ,
CUI Mi-fen ² ,
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

Corresponding author: FEI Zhao-yang, zhaoyangfei@njtech.edu.cn QIAO Xu, qct@njtech.edu.cn
Received Date: 16 May 2017
Revised Date: 26 June 2017

Fund Project: the National Natural Science Foundation of China 21306089Innovation Foundation of Jiangsu Province SJLX15-0347The project was supported by the National Natural Science Foundation of China (21306089) and Innovation Foundation of Jiangsu Province (SJLX15-0347)

Figures(9)

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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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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