Catalytic activity of Pt catalysts promoted by MnO sub(x for n-hexane oxidation)

The deep oxidation of n-hexane was studied over Pt catalysts with small and large Pt crystallites, promoted by MnO sub(x. The Mn was deposited on the Pt/Al) sub(2)O sub(3 by deposition-precipitation method using two alkalis, ammonia and dimethylamine. The strength of the base influenced morphology and performances of Mn-Pt catalysts. Ammonia formed mostly spherical structure of manganese oxide, while dimethylamine created fibrous needle-like shape of MnO) sub(x), typical for cryptomelane phase of manganese oxide. This was confirmed by XPS results that show an oxidation state of Mn close to that for cryptomelane. The Pt-Mn catalysts were more active than catalysts containing Pt only. Promoting effect of MnO sub(x is more pronounced for larger Pt crystallites. Among Pt-Mn samples, catalysts synthesized with dimethylamine exhibited the highest activities. Mobility and reactivity of oxygen from Pt-O-Mn sites associated with cryptomelane phase may be responsible for increased activity.)