Oxygen Permeation and Methane Conversion Properties of CERIA-Based Composite Membranes Prepared by Tape-Casting Technique

2004 ◽  
Author(s):  
H. Takamura ◽  
T. Kobayashi ◽  
A. Kamegawa ◽  
M. Okada
Keyword(s):  
Flux Density ◽  
Methane Conversion ◽  
Tape Casting ◽  
Composite Membranes ◽  
Oxygen Permeation ◽  
Oxygen Flux ◽  
Spinel Type ◽  
Casting Technique ◽  
Oxide Powders ◽  
Dense Membrane

The preparation of ceria-based composite membranes by means of tape-casting technique and their oxygen permeation and methane reforming properties have been investigated. Oxide powders comprising of Ce1−xRExO2−δ (RE = Pr and Sm) and spinel-type ferrites of MFe2O4 (M = Mn and Co) were prepared by the citrate-based liquid-mix technique. As a result of the optimization of ceramics slurry composition, a crack-free dense membrane with dimensions of 5 cm × 5 cm and 140 μm in thickness was successfully prepared by means of doctor-blade technique. For Ce0.9Sm0.1O2−δ - 15 vol% MnFe2O4 membrane with a thickness of 133 μm, an oxygen flux density of 9.5 μmol/cm2 s was attained at 1000 °C under Ar-10% CH4 (100 sccm). The methane conversion and CO selectivity were 22 and 93%, respectively. Laminated membranes comprising of Ce0.9Sm0.1O2−δ - 15 vol% MnFe2O4 and Ce0.9Sm0.1O2−δ - 30 vol% CoFe2O4 were also prepared. The laminated membrane with one Ce0.9Sm0.1O2−δ - 30 vol% CoFe2O4 layer showed a higher oxygen flux density by a factor of 40% than that without Ce0.9Sm0.1O2−δ - 30 vol% CoFe2O4 layer.

Preparation and Oxygen Permeability of Gd-Doped Ceria and Spinel-Type Ferrite Composites

2002 ◽  
Vol 756 ◽  
Author(s):  
Hitoshi Takamura ◽  
Masashi Kawai ◽  
Katsutoshi Okumura ◽  
Atsunori Kamegawa ◽  
Masuo Okada
Keyword(s):  
Grain Size ◽  
Flux Density ◽  
Gas Flow ◽  
Oxygen Permeability ◽  
Oxygen Flux ◽  
Membrane Thickness ◽  
Doped Ceria ◽  
Spinel Type ◽  
Reducing Atmosphere ◽  
Ferrite Composites

ABSTRACTThe preparation and oxygen permeability of composites of Ce0.8Gd0.2O2-ö (GDC) and spinel-type ferrites, MFe2O4 (M = Co and Mn) have been investigated. The composites of GDC -x vol% MFe2O4, where x ranged from 5 to 65, were prepared by a citrate-based liquid-mix technique. The composites were found to be almost fully densified by sintering at 1300 °C for 2 h. From TEM observations, the grain size of GDC and spinel-type phases was found to be less than 0.5 μm. In the case of M = Co, GDC - 25 vol% CoFe2O4 with a membrane thickness of 1.0 mm exhibited an oxygen flux density of 0.21 μmol·cm-2·s-1 under the P(O2) difference between He (20 sccm) and air at 1000 °C. Under reducing atmosphere of Ar-5%H2, the oxygen flux density of this composite increased up to 1.3 μmol·cm-2·s-1. Moreover, under Ar-10%CH4 gas flow, GDC - 15 vol% MnFe2O4 with a membrane thickness of 0.24 mm exhibited the oxygen flux density of 2 and 7 μmol·cm- · s- at 800 and 1000 °C, respectively.

scholarly journals BaTiO3 thick films obtained by tape casting from powders prepared by the oxalate route

2009 ◽  
Vol 3 (1-2) ◽  
pp. 65-71 ◽  
Author(s):  
Adelina Ianculescu ◽  
Sophie Guillemet-Fritsch ◽  
Bernard Durand
Keyword(s):  
Dielectric Constant ◽  
Thick Films ◽  
Tape Casting ◽  
Precipitation Reaction ◽  
Casting Technique ◽  
Air Atmosphere ◽  
Oxide Powders ◽  
Frequency Independent ◽  
Oxalate Route ◽  
Co Precipitation

BaTiO3 powders were prepared by co-precipitation via oxalate route. The size, morphology and particle size distribution of the oxalate powders have been optimized by the control of different synthesis parameters during the precipitation reaction (nature of salts, concentration of different solutions, aging time). The single phase BaTiO3 oxide particles were obtained after a thermal decomposition of the as-synthesized powders at 850?C for 4 hours under air atmosphere. Oxide powders with a suitable specific surface area were selected in order to obtain thick films by the tape casting technique. The microstructure and dielectric properties of the thick films varied obviously depending on the deposition-calcination-sintering cycle used. A double deposition-calcination cycle followed by sintering, as well as a two step deposition-calcination-sintering procedure was used in order to improve the compactness and therefore, the dielectric behaviour. A higher dielectric constant value (~ 750) and lower dielectric losses (~ 2 %) were achieved at room temperature and at 1 kHz frequency for the dense, double-deposited film obtained after two deposition-calcination-sintering cycles. For this film, a superior value of the dielectric constant (~ 1100), almost frequency independent in the frequency range of 100 Hz - 10 kHz was gained also at the ferroelectric-paraelectric phase transition temperature of 130?C. .

scholarly journals Sulfonated poly(arylene ether sulfone) functionalized polysilsesquioxane hybrid membranes with enhanced proton conductivity

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 430-442 ◽  
Author(s):  
Rajdeep Mukherjee ◽  
Arun Kumar Mandal ◽  
Susanta Banerjee
Keyword(s):  
Proton Conductivity ◽  
Sol Gel ◽  
Composite Membranes ◽  
Casting Technique ◽  
Force Microscopy ◽  
Arylene Ether ◽  
Transmission Electron ◽  
Uniform Dispersion ◽  
Solution Casting Technique ◽  
Sulfonated Poly

AbstractSulfopropylated polysilsesquioxane and –COOH containing fluorinated sulfonated poly(arylene ether sulfone) composite membranes (SPAES-SS-X) have been prepared via an in situ sol–gel reaction through the solution casting technique. The composite membranes showed excellent thermal and chemical stability, compared to the pristine SPAES membrane. The uniform dispersion of the sulfonated SiOPS nanoparticles on the polymer matrix was observed from the scanning electron microscope images. Atomic force microscopy and transmission electron microscopy images indicated significantly better phase-separated morphology and connectivity of the ionic domains of the composite membranes than the pristine SPAES membrane. The composite membranes showed considerable improvement in proton conductivity and oxidative stability than the pristine copolymer membrane under similar test conditions.

Al2O3 toughening ScSZ electrolyte fabricated by water-based tape casting technique for solid oxide fuel cells

2021 ◽  
pp. 1-17
Author(s):  
Haoran Wang ◽  
Ze Lei ◽  
Han Zhang ◽  
Yongkang Li ◽  
Junmeng Jing ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Bending Strength ◽  
Tape Casting ◽  
Solid Oxide ◽  
Electrical Performance ◽  
Oxide Fuel ◽  
Casting Technique ◽  
Electrolyte Film ◽  
Water Based

Abstract A water-based tape casting slurry is reported to prepare the ceria and scandia co-doped zirconia (ScSZ) electrolyte films. The slurry is characterized and optimized through Zeta potential and rheological property measurements. Smooth and flat ScSZ electrolyte films are obtained by improving the sintering process. The microstructure, electrical performance, and mechanical property of ScSZ with adding different contents of Al2O3 are also investigated. The results show that a proper amount of Al2O3 has a beneficial effect on the densification of ScSZ. Significant decrease at the grain boundary resistance of ScSZ is observed by Al2O3 addition. The bending strength of the sample with 0.5 wt.% Al2O3 (ScSZ-0.5A) is about 400 MPa, which is 20% higher than pure ScSZ. The ScSZ-0.5A electrolyte film fabricated by water-based tape casting method shows appropriate electrical conductivity and high mechanical strength, which is promising for the practical application in solid oxide fuel cells (SOFCs).

scholarly journals Ice-Templating for the Elaboration of Oxygen Permeation Asymmetric Tubular Membrane with Radial Oriented Porosity

Ceramics ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 246-259 ◽  
Author(s):  
Cyril Gaudillere ◽  
Julio Garcia-Fayos ◽  
Jorge Plaza ◽  
José M. Serra
Keyword(s):  
Ceramic Membrane ◽  
Chemical Reactivity ◽  
Xrd Analysis ◽  
Oxygen Permeation ◽  
Pure Oxygen ◽  
Dense Layer ◽  
Oxygen Production ◽  
X Ray ◽  
Casting Technique ◽  
Tubular Membrane

An original asymmetric tubular membrane for oxygen production applications was manufactured in a two-step process. A 3 mol% Y2O3 stabilized ZrO2 (3YSZ) porous tubular support was manufactured by the freeze-casting technique, offering a hierarchical and radial-oriented porosity of about 15 µm in width, separated by fully densified walls of about 2 µm thick, suggesting low pressure drop and boosted gas transport. The external surface of the support was successively dip-coated to get a Ce0.8Gd0.2O2−δ – 5mol%Co (CGO-Co) interlayer of 80 µm in thickness and an outer dense layer of La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) with a thickness of 30 µm. The whole tubular membrane presents both uniform geometric characteristics and microstructure all along its length. Chemical reactivity between each layer was studied by coupling X-Ray Diffraction (XRD) analysis and Energy Dispersive X-Ray spectroscopy (EDX) mapping at each step of the manufacturing process. Cation interdiffusion between different phases was discarded, confirming the compatibility of this tri-layer asymmetric ceramic membrane for oxygen production purposes. For the first time, a freeze-cast tubular membrane has been evaluated for oxygen permeation, exhibiting a value of 0.31 ml·min−1·cm−2 at 1000ºC under air and argon as feed and sweep gases, respectively. Finally, under the same conditions and increasing the oxygen partial pressure to get pure oxygen as feed, the oxygen permeation reached 1.07 ml·min−1·cm−2.

Oxygen Permeation and Stability of Ce0.8Gd0.2O2−δ–PrBaCo2−xFexO5+δ Dual–phase Composite Membranes

2014 ◽  
Vol 30 (12) ◽  
pp. 1174-1180 ◽  
Author(s):  
Bo Jiang ◽  
Hongwei Cheng ◽  
Longfei Luo ◽  
Xionggang Lu ◽  
Zhongfu Zhou
Keyword(s):  
Composite Membranes ◽  
Oxygen Permeation ◽  
Dual Phase

Porous titanium foil by tape casting technique

2006 ◽  
Vol 175 (1-3) ◽  
pp. 358-363 ◽  
Author(s):  
Zbigniew S. Rak ◽  
Janusz Walter
Keyword(s):  
Tape Casting ◽  
Porous Titanium ◽  
Titanium Foil ◽  
Casting Technique

Novel Preparation Methods for High TcOxide Superconductors

MRS Bulletin ◽  
1989 ◽  
Vol 14 (1) ◽  
pp. 63-66 ◽  
Author(s):  
W.J. Nellis ◽  
L.D. Woolf
Keyword(s):  
Fine Particles ◽  
Ceramic Powder ◽  
Tape Casting ◽  
Oxide Superconductors ◽  
Preparation Methods ◽  
Casting Technique ◽  
Doctor Blade ◽  
Growth Method ◽  
American Physical ◽  
Processing Techniques

High Tc oxide superconductors can be prepared by a variety of novel metallurgical or ceramic processing techniques. For example, forming metallic precursors of YBa2Cu3 or REBa2Cu3, where RE is a rare earth element, followed by oxidation has yielded the corresponding ceramic oxide in pellet, wire, and thin film forms. Ceramic fabrication techniques (which often involve incorporating fine particles of the ceramic in a suitable vehicle) such as doctor-blade tape casting and screen printing have been utilized to synthesize both tapes and thin films. Due to intense worldwide effort to develop these ceramics into useable forms, many unique fabrication techniques have been employed, such as the melt-textured growth method of Jin et al. and dynamic compaction. In addition, it is likely that numerous laboratories, particularly industrial, are developing proprietary methods to fabricate wire and other forms but have not published these results due to the intensely competitive nature of this area. In this article, we review some of the methods reported so far for preparing high Tc ceramic superconductors, and we discuss one example of a proprietary method being developed at one of the author's (LDW) laboratories.Tapes of YBa2cu3O7-x fabricated using the doctor-blade tape casting technique were first displayed by AT&T Bell Laboratories scientists at the 1987 March meeting of the American Physical Society. This method involves mixing ceramic powder, a binder to provide green (unfired ceramic) strength, a plasticizer to provide flexibility, a dispersant to prevent particle agglomeration and a solvent. After mixing all these components together, the solution is poured into a “doctor blade” device which allows a controlled thickness of material to be deposited on a plastic film carrier that passes underneath the doctor blade.

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