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- W2973039012 abstract "Membrane technology is successfully commercialized in various industrial applications, e.g. in treatment of chemicals, food, gas, water or wastewater. Recently it has also emerged in clean and renewable power applications [1]. In particular, dense ceramic membranes having mixed ionic-electronic conductivity (MIEC) can be used for the production of a high purity hydrogen and oxygen via gas separation route, but also for preparation and processing of syngas, e.g. by a partial oxidation of methane. Such membranes can be applied as well in gas separation technology [2]. For instance, oxygen can be preferentially transferred from a gas mixture through the MIEC membrane, allowing to obtain a high-purity O2 for further usage. Many considered MIEC-type oxides, candidate membrane materials which exhibit high mixed ionic-electronic transport properties, and possess either perovskite-type or perovskite-related crystal structure. In such compounds, the electronic component of the electrical conductivity is governed by a double exchange mechanism, while the ionic component in ABO3-δ perovskite-type oxides proceeds by the oxygen vacancy mechanism. However, depending on the chemical composition, temperature, and the oxygen partial pressure, A2BO4±δ compounds may exhibit ionic transport through the oxygen vacancies or the interstitial oxygen. Movement of the interstitial oxygen is unique, due to a low activation energy but also nature of the transport, which is described as the interstitialcy mechanism [3, 4]. Unfortunately, due to the 2D-type conduction in A2BO4±δ, the observed macroscopic conductivity of polycrystalline sinters is relatively low. In this work, various approaches are discussed concerning methods of enhancement of the oxygen permeation through A2BO4±δ ceramic membranes, including preparation of a functional layer having 3D conductivity and introduction of the A-site nonstoichiometry and the B-site doping. It is shown that the A-site deficient A2-xCu1-yNiyMzO4±δ (A - larger lanthanides, M - Sc3+, Ga3+) possess excellent transport properties, and are a suitable basis for the development of a highly-conducting, barium-free, dense ceramic membranes, which can be further enhanced with the functional layer." @default.
- W2973039012 created "2019-09-19" @default.
- W2973039012 creator A5026197958 @default.
- W2973039012 date "2018-04-19" @default.
- W2973039012 modified "2023-09-24" @default.
- W2973039012 title "MIEC-type A 2 BO 4 Ceramic Membranes with Enhanced Oxygen Permeation" @default.
- W2973039012 hasPublicationYear "2018" @default.
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