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Alumina-supported manganese oxides, used as catalysts for the selective catalytic reduction of NO, were characterized by combined electron spin resonance and diffuse reflectance spectroscopies. Upon impregnation of the acetate precursor solution, the [Mn(H2O)6]2+ complex interacts strongly with surface hydroxyls of the γ-Al2O3. Evidence was obtained that this anchoring reaction proceeds at a Mn/OH = 1/2 ratio up to 4.5 wt % Mn loading, leading to a highly dispersed oxidic manganese layer. At higher loadings, the precursor complex is deposited on the surface concurrently. Upon drying at 383 K, part of the manganese is oxidized to higher oxidation states (Mn3+ and Mn4+), while a further increase in (average) oxidation state takes place upon calcination at 573 K. After calcination, the manganese species are present as a mixture of Mn2+, Mn3+, and Mn4+. At low loadings (<1 wt %), approximately equal amounts of these three oxidation states are present, whereas Mn3+ becomes the predominant species at higher loa...

Characterization of Al2O3-Supported Manganese Oxides by Electron Spin Resonance and Diffuse Reflectance Spectroscopy

Characterization of Al₂O₃-Supported Manganese Oxides by Electron Spin Resonance and Diffuse Reflectance Spectroscopy