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Improved activity of Ho-modified Mn/Ti catalysts for the selective catalytic reduction of NO with NH3

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Abstract

A series of Ho-modified Mn/Ti catalysts with various content of Ho were prepared by impregnation method, and the low-temperature catalytic performance was tested. Techniques of BET, SEM, XRD, H2-TPR, and XPS were carried out to research the effects of Ho modification on the physicochemical properties of Mn/Ti catalysts. Results showed that appropriate Ho addition could reduce the starting temperature of Mn/TiO2 catalyst to 100 °C. 0.2HoMn/Ti exhibiting a wider temperature range of 140~220 °C with nearing 100% NOx conversion. It was found that the 0.2HoMn/TiO2 catalyst possessed a better dispersion of active component, enhanced redox capacity, a higher concentration of Mn4+ species, and a larger amount of Oβ content on the catalyst surface, which are all likely predominant factors related to the excellent SCR activity. Additionally, Ho improved the Lewis acid sites and enhanced the adsorption and activation ability of NH3, as well as the NO to NO2 oxidation ability. The selective catalytic reduction with ammonia (NH3-SCR) deNOx mechanism over HoMn/Ti catalysts obeyed both the Eley–Rideal (E-R) and Langmuir–Hinshelwood (L-H) mechanisms under low-temperature reaction conditions.

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Funding

This work was supported by the National Key R&D Program of China (2017YFB0603201), Key Research and Development Projects of Jiangsu Province (BE2017716), and Environmental nonprofit industry research subject (2016YFC0208102).

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Authors and Affiliations

  1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu, China

    Yaping Zhang, Peng Wu, Guobo Li, Kai Shen & Tianjiao Huang

  2. State Power Environmental Protection Research Institute, Nanjing, 210031, Jiangsu, China

    Ke Zhuang & Sheng Wang

Authors
  1. Yaping Zhang
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  2. Peng Wu
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  3. Guobo Li
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  4. Ke Zhuang
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  5. Kai Shen
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  6. Sheng Wang
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  7. Tianjiao Huang
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Correspondence to Kai Shen.

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Responsible editor: Santiago V. Luis

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Zhang, Y., Wu, P., Li, G. et al. Improved activity of Ho-modified Mn/Ti catalysts for the selective catalytic reduction of NO with NH3. Environ Sci Pollut Res 27, 26954–26964 (2020). https://doi.org/10.1007/s11356-020-07749-w

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