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• W817162334 abstract "BaO is a proven oxygen-selective sorbent for air separation via the BaO–BaO2 oxygen sorption–desorption cycle. However, the low transition O2 pressure necessitates a high vacuum that is required for desorption, hence limiting its application. Here, we report facile synthesis of new oxygen-selective BaxSr1−xO/MgO nano-composite sorbents from which O2 can be desorbed at moderate vacuum pressures. These sorbents are obtained from BaxSr1−xMg(CO3)2 precursors synthesized by co-precipitation followed by calcination. It is shown that the transition O2 pressure for the oxide-peroxide cycle is significantly increased by increasing the Sr2+/Ba2+ ratio. XRD results show that the crystal structures are preserved while the lattice constants are reduced upon substitution of Ba2+ by Sr2+ in both precursor carbonates and peroxides. Transmission electron microscopy/energy dispersive X-ray spectroscopy results show that Ba2+ and Sr2+ are mixed molecularly in BaxSr1−xO/MgO nano-composite. We explain that the uniformly substituted Sr2+ in BaO/BaO2 changes the dissociation energy of peroxide ions and the equilibrium of the reversible reactions, promoting decomposition of BaO2. Cyclic O2 sorption and desorption with BaxSr1−xO/MgO nano-composite is demonstrated." @default.
• W817162334 created "2016-06-24" @default.
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• W817162334 date "2015-12-01" @default.
• W817162334 modified "2023-09-27" @default.
• W817162334 title "BaxSr1−xO/MgO nano-composite sorbents for tuning the transition pressure of oxygen: Application to air separation" @default.
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• W817162334 doi "https://doi.org/10.1016/j.ces.2015.06.050" @default.
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