MnOx-TiO2 catalyzers for valatil organic compounds elimination.

Mn-Ti mixed oxides with stoichiometry TixMn1-xOy (with x = 0, 0.1, 0.2, 0.5 , 0.8, 0.9, 1) have been prepared by a coprecipitation method. Mn3O4 (hausm annite) and TiO2 (anatase) were found to be the main crystalline phases, wh ile solid solutions appeared to be formed at the extreme values of x. Therm al stability of these materials reaches 873 K, transforming into thermodyna mically stable phases, TiO2 (rutile) y alpha-Mn2O3, at higher temperatures. From catalytic point of view, they are active in propane and propene oxida tion, though the increase of Ti content seems to deactivate Mn oxide for pr opene oxidation. Conversely, the sample with the Mn/Ti = 1 ratio presents a maximum for propane oxidation.