Well-crystalline monoclinic Mn5O8, tetragonal Mn3O4 and cubic Mn2O3 were synthesized via a solvothermal route followed by distinct heat treatment. The formation of different MnO5 species observed by X-ray diffraction (XRD) measurements showed temperature dependent phase transformation occurring during the heat treatment process. XRD patterns showed that Mn3O4 and Mn5O8 were formed at calcination temperature range of 573-673 K and a new phase Mn2O3 appeared at 773 K, respectively. And a tendency to the formation of Mn5O8 was found as the solvothermal temperature turns higher. The catalytic activities of various MnOx for selective catalytic reduction (SCR) of nitrogen oxides were evaluated between 353 and 573 K using ammonia as reducer. Mn5O8 appeared to exhibit the highest activity, followed by Mn3O4, Mn2O3. (C) 2018 Published by Elsevier B.V.