Abstract
Unsupported and alumina supported manganese oxide catalysts were prepared using manganese nitrate, manganese hydroxide and ammonium permanganate. They were bulk and surface characterized by thermal analysis, X-ray diffraction, diffuse reflectans, IR and photoelectron spectroscopy, SBET and TPR. Moreover H2O2 decomposition and CO oxidation were used as test reactions. The most active supported catalysts are the manganese hydroxide coated samples which show a Γ-Mn2O3 phase. For the ammonium permanganate-based catalysts a strong interaction with the carrier was evidenced.