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Study on hydrothermal deactivation of Pt/MnO x -CeO2 for NO x -assisted soot oxidation: redox property, surface nitrates, and oxygen vacancies

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Abstract

The study mainly focuses on surface properties to investigate the deactivation factors of Pt/MnO x -CeO2 by H2 temperature-programmed reduction, CO chemical adsorption, NO x -temperature-programmed desorption (TPD), O2-TPD, NO temperature-programmed oxidation, SEM, TEM, in situ diffuse reflectance infrared Fourier transform spectra, Raman, and thermogravimetric methods. The results show that there are three main factors to lead to hydrothermal deactivation of the catalyst: redox property, oxygen vacancy, and surface nitrates. The loss of oxygen vacancies decreases the generation and desorption of active oxygen and that of surface nitrates weakens the production of NO2 and surface peroxides (-O2−). These factors greatly result in the damage of the C-NO2-O2 cooperative reaction.

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Funding

This study was financially supported by the National High Technology Research and Development Project of China (No. 2015 AA034603) and Science and Technology Project of Chengdu (No. 2015-HM01-00067-SF).

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Authors and Affiliations

  1. College of Chemical Engineering, Sichuan University, Chengdu, 610064, People’s Republic of China

    Hailong Zhang & Xi Feng

  2. College of Chemistry, Sichuan University, Chengdu, 610064, People’s Republic of China

    Shanshan Li, Qingjin Lin, Yaoqiang Chen & Jianli Wang

Authors
  1. Hailong Zhang
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  2. Shanshan Li
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  3. Qingjin Lin
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  4. Xi Feng
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  5. Yaoqiang Chen
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  6. Jianli Wang
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Correspondence to Yaoqiang Chen or Jianli Wang.

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Responsible editor: Vítor Pais Vilar

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Zhang, H., Li, S., Lin, Q. et al. Study on hydrothermal deactivation of Pt/MnO x -CeO2 for NO x -assisted soot oxidation: redox property, surface nitrates, and oxygen vacancies. Environ Sci Pollut Res 25, 16061–16070 (2018). https://doi.org/10.1007/s11356-018-1582-5

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