This work investigates the surface and catalytic properties of Co containing metal oxides MeSrCoO by partially substitution of Sr with another alkaline metal Me (Ba, Ca and Mg). The catalysts were used for the degradation of a textile dye orange II (OII) under dark conditions and without the addition of any chemical additive, light irradiation or energy input. Although all catalysts were prepared under the same conditions, BaSrCoO formed a pure perovskite phase, while MgSrCoO and CaSrCoO resulted in a mixture of perovskite and metal oxide phases. All these catalysts were characterised by a nonporous materials with low surface areas (

Keywords:Metal oxides;Heterogeneous catalysis;Stable catalytic surfaces;Dark ambient conditions;OII degradation