Synthesis of three novel ε-Keggin based mixed metal oxides composed of (NH4)xHy[Mo12O40M1.8−2.1] (M = In, Y, Mg) and their microporosities

ε-Keggin based mixed metal oxide (ε-MoMO) is comprised of the network arrangement based on ε-Keggin {Mo12O40} unit and {MO6} octahedral, forming a framework structure containing cage and channel textures like FAU-type zeolite. In this study, we successfully synthesized three novel ε-MoMO, namely ε-MoMgO, ε-MoYO, and ε-MoInO, and their physicochemical properties were investigated. All these materials showed microporosity to adsorb CO2 up to 33−42% in their crystallographically expected microporous capacity.