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The development of a catalyst for the selective catalytic reduction (SCR) of NO x is essential for purifying air and the denitration of coal-burning exhaust. Herein, we prepare novel MnO x -CeO2 nanosheets with porous structures by a homogeneous coordination precipitation (HCP) method which exhibit a high NO removal efficiency above 90 % in the SCR reaction at low temperature (150–240°C). The MnO x -CeO2(HCP) catalysts have a higher Brunauer–Emmett–Teller (BET) surface area and more homogeneous distribution of Mn x+ in the CeO2 lattice than those prepared by co-precipitation and precursor mixture combustion methods according to BET, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy characterizations. Together with a higher ratio of Mn4+, Ce3+, and Oα, the above properties are responsible for the high catalytic performances of MnO x -CeO2(HCP) in the SCR of NO x. Well defined MnO x -CeO2 nanosheets with porous structures obtained by a homogeneous coordination precipitation method exhibit a high NO removal efficiency above 90 % in the SCR reaction at a low temperature of 150°C. [ABSTRACT FROM AUTHOR]