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

Abstract

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.

Review on Polymeric, Inorganic, and Composite Materials for Air Filters: From Processing to Properties

“…Different types of foams and porous structures could be prepared by several techniques, including direct blowing, phase separation, replica, etching, thermal decomposition, etc. [155][156][157][158][159][160][161][162][163][164][165][166] Recently, single-layer polyimide (PI) film air filters were patterned with thru-holes by ion milling, which allows fabricating micrometer holes of defined sizes by photolithography. [167] More common than thin, single-layer filters are thicker filters, often accompanied by larger pore sizes.…”

Recent Advances in Molten-Carbonate Membranes for Carbon Dioxide Separation: Focus on Material Selection, Geometry, and Surface Modification

“…Impact of global warming on climate change is one of the serious threats to human survival. In this regard, the first step is to reduce the CO 2 emissions by separating it from industrial flue gases and air [1]. CO 2 separation process should be energetically and economically viable and the separated CO 2 should be used as a potential carbon source in different chemical processes and fuel production [2].…”

Synthesis and Characterization of 40 wt % Ce0.9Pr0.1O2–δ–60 wt % NdxSr1−xFe0.9Cu0.1O3−δ Dual-Phase Membranes for Efficient Oxygen Separation

“…Similar selection criteria for the ionic conducting material have to be considered allowing for high electronic conductivity in combination with a high chemical and thermal compatibility [ 4 ]. The above-mentioned factors have made Ce 0.8 Sm 0.2 O 2− δ –Sm 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3− δ (CSO-SSFCO), Ce 0.9 Pr 0.1 O 2− δ –Pr 0.6 Ca 0.4 FeO 3− δ (CPO-PCFO), Ce 0.8 Gd 0.2 O 2− δ –Pr 0.5 Sr 0.5 Fe 0.5 Co 0.5 O 3− δ (CGO-PSFCO), and Ce 0.9 Nd 0.1 O 2− δ –Nd 0.6 Sr 0.4 CoO 3− δ (CNO-NSCO) intensively investigated materials [ 2 , 3 , 4 , 6 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ]. Although the CO 2 resistance has been improved, most of their oxygen permeation fluxes are still too low to meet the requirements for practical applications.…”