Abstract
A Y-doped TiO 2 -supported MnO X has been developed by partly substituting the Ti 4+ of the catalyst with Y 3+ to promote oxygen vacancies for charge compensation. The aim of this study was to improve the activity of low-temperature SCR of NO with NH 3 in the presence of excess oxygen by means of increasing the amount of oxygen vacancies. Analysis by PL spectra, XPS and EPR showed that Y doping increased the amount of oxygen vacancies and superoxide ions. The catalytic activity of NO removal was promoted by Y doping. ► NO removal is enhanced on the Y-doped MnO X /TiO 2 catalysts for low-temperature SCR. ► Y doping can increase oxygen vacancies for charge compensation on the catalysts. ► Oxygen vacancies by Y doping are responsible for the high catalytic activity.
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