Ti doped MnOx catalysts for the removal of NO with NH3 (NH3‒SCR) were prepared by coprecipitation method. The results showed that pure MnOx is composed of dominant Mn3O4 with (101) plane and small amorphous MnO2, while TiOx only forms anatase TiO2. When Ti is doped into MnOx, as-prepared samples can form amorphous phase, and Mn1Ti2Ox samples achieve 446 m2/g of specific surface area and 0.65 cm3/g of total pore volume. NH3 can be adsorbed on MnOx and TiO2 surface, but the former is weak and the latter is strong. Ti doping changes the acid site distribution and surface adsorbed oxygen of MnOx. Mn1Ti1Ox has more available oxygen vacancies to produce NO2 and achieves a good deNOx activity below 200 °C. With the increase of reaction temperature, more O2 can be dissociated into O‒, causing that Mn‒containing catalysts show a complete NO removal at 200‒300 °C. When the temperature is higher than 300 °C, adsorption and activation of NH3 become the rate‒determining step with the strong supply of NO2. TiOx can achieve 30% NO removal efficiency while MnOx is 100% at 200‒300 °C. Mn1Ti1Ox samples have 95% of NO removal efficiency at 100 °C and maintain 100% in the range of 150‒320 °C. Nearly 100% N2 selectivity is attained for all samples in the range of 80–160 °C, but the N2 selectivity gradually decreases when the temperature is higher than 200 °C.