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Detailed information on the selected research project
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| Title |
Development of Hydrogen Seperation Mebranes for Space Applications |
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Subject
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Membrane Separation
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Investigators/
Organizations
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Elbaccouch, M; University of Central Florida/Florida Solar Energy Center
A. Raissi; University of Central Florida/Florida Solar Energy Center
N. Mohajeri; University of Central Florida/Florida Solar Energy Center
S. Seal; University of Central Florida/Laboratory for Surface Engineering, Materials Processing & Nonotechnology
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Funding
Source(s) |
National Aeronautics and Space Administration; Glenn Research Center; amount:$190,000
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| Dates |
Project start date:01-Oct-2004, Project end date:01-Oct-2005 |
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Abstract
The objectives of this work are to prepare and characterize perovskite ceramic oxides composed of terbium-doped strontium cerate (SrCe0.95Tb0.05O3-δ). The membrane systems will be synthesized in the form of thin films (1-3 µm thick) on porous supports by spin-coating using ethylene glycol polymeric precursor. In addition, the membrane systems will be fabricated as disks (1-2 mm thick) using the citrate wet chemical technique. The synthesized ceramic disks and thin films will be characterized as a function of hydrogen permeability, stoichiometry, film thickness, and morphology.
Hydrogen permeation will be carried out using in-house hydrogen permeation unit. The chemical stability and durability of the membranes will be addressed by exposing the membranes to both representative and accelerated conditions in order to quantify the kinetics of the reaction. The miscibility and phase behavior of the membranes will be modeled using Fact Sage simulator for optimum processing performance.
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Work Significance
The mixed conductivity of doped perovskite ceramic oxides have been receiving considerable attention in the development of solid oxide fuel cells (SOFCs), gas sensors, and hydrogen permeation membranes. The doped perovskite structure for the hydrogen separation membranes have several characteristics including, infinite H2 selectivity, low H2 chemical potential gradient, operating temperature range of 500-1000oC, inexpensive compared to palladium membranes, simple and flexible compared to pressure swing adsorption technology, and does not require external power. Ceramic membranes for hydrogen separation must exhibit both ionic and electronic conductivity in order to achieve hydrogen permeation flux suitable for practical applications. Also, they must be dense in order to achieve infinite hydrogen selectivity. At high temperatures (>500oC), ceramic oxide materials with perovskite structures (A2+B4+O3) have the required ionic-electronic conductivity when the B-sites are doped with trivalent cations (M). This doping process creates oxygen-ion vacancies (Vo..) within the lattice as means of charge compensation. |
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Supporting Documents
Mohamed - Dev of H2 Seperation Membranes.pdf
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Document Description
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Project Website
http://www.fsec.ucf.edu/hydrogen/research/funded_nasa.htm
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