TiO 2 -supported manganese catalysts have been widely investigated because of their unique catalytic properties. A series of Mn−Ce−Ti−O catalysts were synthesized by a modified sol−gel method. Mn atom doping into CT-0/1 samples results in anatase partly transforming into rutile and two-phase coexistence. X-ray photoelectron spectroscopy and NH 3 temperature programmed desorption analysis show that the reactions of Mn 3+ + Ti 4+ ↔ Mn 4+ + Ti 3+ and Ce 4+ + Mn 3+ ↔ Ce 3+ + Mn 4+ happened, which is propitious to generating plentiful oxygen defects and chemical adsorbed oxygen and beneficial for the oxidation of NO to NO 2 . In addition, doping of Mn atoms could produce more acid sites and increase the ability of adsorption NH 3 that reacted with NO 2 to achieve high performance of deNO x in a wide temperature window. In situ diffusion reflectance infrared Fourier transform spectroscopy shows that MCT-15/1 achieves unpredictable NH 3 selective catalytic reduction activity following transition from the Langmuir−Hinshelwood (L−H) mechanism to the Eley−Rideal (E−R) mechanism with rising temperature.
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