Citation: Wei Li, Cheng Zhang, Xin Li, Peng Tan, Anli Zhou, Qingyan Fang, Gang Chen. Ho-modified Mn-Ce/TiO₂ for low-temperature SCR of NO_x with NH₃: Evaluation and characterization[J]. Chinese Journal of Catalysis, ;2018, 39(10): 1653-1663. doi: 10.1016/S1872-2067(18)63099-2 shu

Ho-modified Mn-Ce/TiO₂ for low-temperature SCR of NO_x with NH₃: Evaluation and characterization

State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China

Received Date: 4 April 2018
Revised Date: 8 May 2018

Fund Project: This work was supported by the National Key Research and Development Program of China (NO.2018YFB0605105)

Low-temperature selective catalytic reduction (SCR) of NO with NH₃ was tested over Ho-doped Mn-Ce/TiO₂ catalysts prepared by the impregnation method. The obtained catalysts with different Ho doping ratios were characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), temperature-programmed reduction (H₂-TPR), temperature-programmed desorption of NH₃ (NH₃-TPD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The catalytic activities were tested on a fixed bed. Their results indicated that the proper doping amount of Ho could effectively improve the low-temperature denitrification performance and the SO₂ resistance of Mn-Ce/TiO₂ catalyst. The catalyst with Ho/Ti of 0.1 presented excellent catalytic activity, with a conversion of more than 90% in the temperature window of 140-220℃. The characterization results showed that the improved SCR activity of the Mn-Ce/TiO₂ catalyst caused by Ho doping was due to the increase of the specific surface area, higher concentration of chemisorbed oxygen, higher surface Mn⁴⁺/Mn³⁺ ratio, and higher acidity. The SO₂ resistance test showed that the deactivating influence of SO₂ on the catalyst was irreversible. The XRD and XPS results showed that the main reason for the catalyst deactivation was sulfates that had formed on the catalyst surface and that Ho doping could inhibit the sulfation to some extent.
- Mn-Ce-Ho/TiO₂,
- Low-temperature selective catalytic reduction,
- Catalyst,
- Holmium,
- SO₂
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Ho-modified Mn-Ce/TiO₂ for low-temperature SCR of NO_x with NH₃: Evaluation and characterization