MnOx–CeO2@TiO2 core–shell composites for low temperature SCR of NOx

Abstract

In this study, a MnO_x–CeO₂@TiO₂ catalyst for NH₃-SCR of NO_x at low temperature was successfully prepared. TiO₂ was distributed on the MnO_x–CeO₂ nanorod surface to form the core–shell structure. MnO_x–CeO₂@TiO₂ had excellent catalytic performance and SO₂ resistance. Characterization results indicated that the excellent catalytic performance of MnO_x–CeO₂@TiO₂ could be mainly attributed to the large specific surface area, the presence of oxygen vacancies, the strong redox ability and the abundant acidic sites. Moreover, the catalytic active sites of MnO_x–CeO₂@TiO₂ could be protected from SO₂ poisoning due to the existence of the TiO₂ shell. MnO_x–CeO₂@TiO₂ was proven to be an excellent low temperature SCR catalyst.