2018-Sustainable Industrial Processing Summit
SIPS2018
Volume 6. New and Advanced Materials and Technologies
| Editors: | F. Kongoli, F. Marquis, P. Chen, T. Prikhna, N. Chikhradze |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 392 pages |
| ISBN: | 978-1-987820-92-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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MIEC-type A2BO4 Ceramic Membranes with Enhanced Oxygen Permeation
Konrad Swierczek1;1AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, FACULTY OF ENERGY AND FUELS, Krakow, Poland;
Type of Paper: Regular
Id Paper: 194
Topic: 43
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 O<sub>2</sub> 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 ABO<sub>3-δ</sub> perovskite-type oxides proceeds by the oxygen vacancy mechanism. However, depending on the chemical composition, temperature, and the oxygen partial pressure, A<sub>2</sub>BO<sub>4±δ</sub> 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 A<sub>2</sub>BO<sub>4±δ</sub>, 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 A<sub>2</sub>BO<sub>4±δ</sub> 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 A<sub>2-x</sub>Cu<sub>1-y</sub>Ni<sub>y</sub>M<sub>z</sub>O<sub>4±δ</sub> (A - larger lanthanides, M - Sc<sup>3+</sup>, Ga<sup>3+</sup>) 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.
Keywords:
New and advanced materials;References:
[1] A. Gugliuzza, A. Basile (Editors), Membranes For Clean And Renewable Power Applications, Woodhead Publishing Limited, 2014.[2] K. Li, Ceramic Membranes For Separation And Reaction, John Wiley & Sons Ltd, 2007.
[3] A.C. Tomkiewicz, M. Tamimi, A. Huq, S. McIntosh, J. Mater. Chem. A 3 (2015) 21864.
[4] T. Ishihara (Editor), Perovskite Oxide for Solid Oxide Fuel Cells, Springer, 2009.