Preferential dissolution of copper from Cu-Mn oxides in strong acid medium: Effect of the starting binary oxide to get new efficient copper doped MnO2 catalysts in toluene oxidation

This work investigated the concept of preferential dissolution copper in HNO3 10 M at 20 °C from two starting Cu-Mn oxides to acquire novel doped MnO2 like polymorphs. On purpose were tested: a nanocristalline CuMn2O4 spinel phase with SSA 47 m2/g and weak amorphous oxide Mn/Cu atomic ratio 4.8 (SSA: 166 m2/g). The physico-chemical properties final discussed terms nature operating conditions applied for acid treatment. Finally, these new ?/? assessed toluene oxidation their catalytic performances compared those ?-MnO2 ?-MnO2 catalysts. obtained exhibited highest activity T50(CO2). was related high density Cu-O-Mn interactions outermost layers catalyst as by ToF-SIMS results.