Abstract
Abstract Various MnO x states played diverse roles in the selective catalytic reduction (SCR). Precursors and atmospheres had essential influence on valence conditions of MnO x . TiO 2 -supported manganese oxide catalysts were prepared from three different precursors in N 2 , O 2 and air atmospheres. These samples were characterized by XRD, TG–DSC–MS and thermodynamic calculation. Characterization results showed that MnO 2 was acquired by calcining manganese nitrate (MN) and TiO 2 in air, while manganese carbonate (MC) and manganese acetate (MA) precursors both caused mainly Mn 2 O 3 and Mn 3 O 4 . MA-MnO x /TiO 2 catalysts calcined in nitrogen demonstrated active ingredients of MnO 2 , Mn 2 O 3 and Mn 3 O 4 , but consisted of MnO 2 , Mn 2 O 3 , Mn 3 O 4 and MnTiO 3 calcined in oxygen. Different MnO x were identified by thermodynamic parameters and TG–DSC–MS studies.
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