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Incorporation of basic metal species (oxides) such as magnesium oxide and calcium oxide into porous materials is a logical strategy for enlarging the uptake of acidic greenhouse gases such as CO2. This work reports the development of ordered mesoporous silica (OMS) with incorporated magnesium and calcium oxides for CO2 sorption at ambient and elevated temperatures. These materials were prepared by using the sol–gel method in the presence of the triblock copolymer Pluronic P123 in acidic medium followed by evaporation-induced self-assembly (EISA). The resulting magnesium oxide (MgO)- and calcium oxide (CaO)-OMS materials were used for CO2 sorption at low (0, 15 °C), ambient (25 °C), and elevated (120 °C) temperatures. Temperature programmed desorption (TPD) was used to measure the CO2 sorption capacities for the mesostructures studied at 120 °C. These sorbents exhibited relatively …