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Abstract
Oxy-fuel combustion is one of the proposed technologies with the potential to achieve zero CO2 emission. La1−xCaxCo1−yFeyO3−δ (LCCF) perovskites are promising materials with high selectively for oxygen. In this study, the oxygen non-stoichiometry of perovskites LCCF was investigated by means of iodometric titration. LCCF was prepared using the liquid citrate method, and the phase structures were identified by X-ray diffraction. Fixed-bed experiments were performed to study the oxygen desorption performance of LCCF. The oxygen deficiency of LCCF increased with increasing Ca molar content of A site, but the value of δ of LCCF with increasing Fe molar content in B site is nearly constant. Experimental observation demonstrated that the O2 release amount of LCCF does not depend on oxygen non-stoichiometry δ generated from A-site doping. At the same time, doping Fe in B site has an obvious impact on the oxygen desorption amount.
Highlights
In the combustion of fossil fuels, carbon dioxide emissions into the atmosphere lead to global warming [1,2,3]
The perovskite La1−x Cax Co1−y Fey O3−δ (LCCF) sorbents with different A-/B-site doping amounts were synthesized by the liquid citrate method
The tolerance factor suggests that LCCF5582 has the most stable perovskite-type structure
Summary
In the combustion of fossil fuels, carbon dioxide emissions into the atmosphere lead to global warming [1,2,3]. Oxy-fuel combustion is one of the proposed technologies that has the potential to achieve a zero CO2 emission. One of the key barriers for the implementation of oxy-combustion, is the cost of producing the oxygen. Cryogenic air-separation is an available method that has a major drawback—high energy consumption. A new application of the perovskite metal oxides is to use them as sorbents in high-temperature sorption processes for air separation to produce. Perovskites have been extensively studied in applications like solid oxide fuel cells, oxygen-permeable membranes, gas sensors, catalysts, and photocatalytic materials [6,7,8,9]
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