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Organosilica-Based Membranes in Gas and Liquid-Phase Separation
Open AccessArticle

Ceria-Based Dual-Phase Membranes for High-Temperature Carbon Dioxide Separation: Effect of Iron Doping and Pore Generation with MgO Template

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Fachgebiet Keramische Werkstoffe / Chair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Faculty III–Process Sciences, Technische Universität Berlin, Hardenbergstr. 40, 10623 Berlin, Germany
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Division 5.4 Ceramic Processing and Biomaterials, Bundesanstalt für Materialforschung und -prüfung, Unter den Eichen 44-46, 12203 Berlin, Germany
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Author to whom correspondence should be addressed.
Membranes 2019, 9(9), 108; https://doi.org/10.3390/membranes9090108
Received: 26 July 2019 / Revised: 15 August 2019 / Accepted: 16 August 2019 / Published: 26 August 2019
Dual-phase membranes for high-temperature carbon dioxide separation have emerged as promising technology to mitigate anthropogenic greenhouse gases emissions, especially as a pre- and post-combustion separation technique in coal burning power plants. To implement these membranes industrially, the carbon dioxide permeability must be improved. In this study, Ce0.8Sm0.2O2−δ (SDC) and Ce0.8Sm0.19Fe0.01O2−δ (FSDC) ceramic powders were used to form the skeleton in dual-phase membranes. The use of MgO as an environmentally friendly pore generator allows control over the membrane porosity and microstructure in order to compare the effect of the membrane’s ceramic phase. The ceramic powders and the resulting membranes were characterized using ICP-OES, HSM, gravimetric analysis, SEM/EDX, and XRD, and the carbon dioxide flux density was quantified using a high-temperature membrane permeation setup. The carbon dioxide permeability slightly increases with the addition of iron in the FSDC membranes compared to the SDC membranes mainly due to the reported scavenging effect of iron with the siliceous impurities, with an additional potential contribution of an increased crystallite size due to viscous flow sintering. The increased permeability of the FSDC system and the proper microstructure control by MgO can be further extended to optimize carbon dioxide permeability in this membrane system. View Full-Text
Keywords: samarium doped ceria; SDC; FSDC; CO2 separation membranes; scavenging effect of iron; permeability samarium doped ceria; SDC; FSDC; CO2 separation membranes; scavenging effect of iron; permeability
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MDPI and ACS Style

Gili, A.; Bischoff, B.; Simon, U.; Schmidt, F.; Kober, D.; Görke, O.; Bekheet, M.F.; Gurlo, A. Ceria-Based Dual-Phase Membranes for High-Temperature Carbon Dioxide Separation: Effect of Iron Doping and Pore Generation with MgO Template. Membranes 2019, 9, 108.

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