Journal ArticleDOI
Failure mechanisms of ceramic membrane reactors in partial oxidation of methane to synthesis gas
S. Pei,M.S. Kleefisch,T.P. Kobylinski,J. Faber,C.A. Udovich,V. Zhang-McCoy,B. Dabrowski,U. Balachandran,R.L. Mieville,R. B. Poeppel +9 more
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In this paper, the authors examined the starting material and fractured membranes using a combination of X-ray diffraction and thermogravimetric analyses and found that the first type of fracture was the consequence of an oxygen gradient in the membrane, pointing from the reaction side to the air side, leading to fracture.Abstract:
In the course of generating synthesis gas (H2, CO) from methane, we have observed two types of fractures occurring on the Sr(Co, Fe)Ox-type oxygen membrane reactors The first type occurred shortly after the reaction started and the second type often occurred days after the reaction To determine the causes of these fractures, we have examined the starting material and fractured membranes using a combination of X-ray diffraction and thermogravimetric analyses We found that the first type of fracture was the consequence of an oxygen gradient in the membrane, pointing from the reaction side to the air side This causes a lattice mismatch inside the membrane, leading to fracture The second type of fracture, however, was the result of a chemical decomposition We found that the Sr(Co, Fe)Ox-type membrane had been reduced to SrCO3, and elemental Co and Fe by the synthesis gas generated in the reaction The decomposition causes enormous expansion leading to a large crack along the axis of tuberead more
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Journal ArticleDOI
Mixed ionic-electronic conducting (MIEC) ceramic-based membranes for oxygen separation
Jaka Sunarso,Stefan Baumann,José M. Serra,Wilhelm A. Meulenberg,Shaomin Liu,Y.S. Lin,J. C. Diniz da Costa +6 more
TL;DR: In the last 30 years, research efforts by the scientific community intensified significantly, stemming from the pioneering work of Takahashi and co-workers, with the initial development of mixed ionic-electronic conducting (MIEC) oxides.
Journal ArticleDOI
Investigation of the permeation behavior and stability of a Ba0.5Sr0.5Co0.8Fe0.2O3−δ oxygen membrane
TL;DR: In this article, a combined citrate-EDTA complexing method was used for the preparation of SCFO and Ba0.2O3-delta (BSCFO) oxides, and the results of O-2-TPD and XRD showed that the introduction of barium into SCFO could effectively suppress the oxidation of Co3+ and Fe3+ to higher valence states of Co4 and Fe4+ in the lattice and stabilize the perovskite structure under lower oxygen partial pressures.
BookDOI
The CRC handbook of solid state electrochemistry
TL;DR: In this article, H.J. Bouwmeester and P.G. Schoonman survey of types of Solid Electrolytes, T.C. Granqvist Index
Journal ArticleDOI
Dense ceramic membranes for methane conversion
TL;DR: In this paper, a survey of the material properties that govern the performance of mixed-conducting membranes in real operating conditions and highlights significant developments in the field is presented, where the authors mainly focus on material properties.
Journal ArticleDOI
Progress in understanding and development of Ba0.5Sr0.5Co0.8Fe0.2O3−δ-based cathodes for intermediate-temperature solid-oxide fuel cells: A review
Wei Zhou,Ran Ran,Zongping Shao +2 more
TL;DR: In this article, a review of the current research activities on BSCF-based cathodes for intermediate-temperature (IT)-SOFCs is presented and analyzed to provide some guidelines in the search for the new generation of cathode materials for IT-SOFC.
References
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A profile refinement method for nuclear and magnetic structures
TL;DR: In this paper, a structure refinement method was described which does not use integrated neutron powder intensities, single or overlapping, but employs directly the profile intensities obtained from step-scanning measurements of the powder diagram.
Journal ArticleDOI
Synthesis of ethylene via oxidative coupling of methane: I. Determination of active catalysts
G. E. Keller,Madan Mohan Bhasin +1 more
TL;DR: The most active catalysts for C2 formation were the oxides of Sn, Pb, Sb, Bi, Tl, Cd and Mn, while Li, Mg, Zn, Ti, Zr, Mo, Fe, Cr, W, Cu, Ag, Pt, Ce, V, B and Al showed little or no activity.
Journal ArticleDOI
Oxygen permeation through perovskite-type oxides
TL;DR: In this article, mixed conductive perovskite-type oxides are shown to be promising materials for oxygen permeation at elevated temperatures, showing that the permeability was mainly controlled by the amount of oxygen vacancies.
Journal ArticleDOI
The Fischer‐Tropsch Synthesis: Molecular Weight Distribution of Primary Products and Reaction Mechanism
TL;DR: In this paper, the Schulz-Flory equation is used to describe the molecular weight distribution of the primary products in the Fischer-Tropsch procedure for the production of hydrocarbons and alcohols.