Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 16, Pages 16061-16070Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-1582-5
Keywords
Soot oxidation; Hydrothermal aging; Deactivation; Surface nitrates; Oxygen vacancies
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Funding
- National High Technology Research and Development Project of China [2015 AA034603]
- Science and Technology Project of Chengdu [2015-HM01-00067-SF]
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The study mainly focuses on surface properties to investigate the deactivation factors of Pt/MnOx-CeO2 by H-2 temperature-programmed reduction, CO chemical adsorption, NOx-temperature-programmed desorption (TPD), O-2-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 (-O-2(-)). These factors greatly result in the damage of the C-NO2-O-2 cooperative reaction.
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