Dual Phase Membrane for High Temperature CO2 Separation Page: 9 of 19
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Electronic conductivity of uninfiltrated, sintered LSCF was measured by the four-point DC
method. Conductivity measurements were obtained in a low oxygen partial pressure (PO2= 10-4
atm), helium environment from 300-900 C. SEM imaging (Phillips XL-30) was performed to
confirm the porous and dense nature of the supports before and after infiltration.
High Temperature Sealing of Metal Dual-Phase Membrane
Sealing membranes for experiments in 400-600 C under oxidizing atmosphere is a
challenging problem. Various kinds of sealing materials were tested for the high temperature
permeation cell. Conventional rubber o-rings were used to verify gas-tightness obtained during
coating procedure because rubber showed best sealability at room temperature. Graphite
displayed both good compressibility and temperature resistance, but could be oxidized with
oxygen around the operating temperatures (450-500 C). Metal seals were also tested because it
was easier to work with them.
Sealing of Ceramic Dual-Phase Membrane
High temperature permeation experiments for the ceramic dual-phase membrane
performed by sealing the dual-phase membrane to a 1" OD alumina tube. The membrane could
not be sealed in a compression cell due to the lower mechanical strength of the support in
comparison to the metallic membrane. The LSCF dual-phase membrane was sealed to the tube
by creating a paste composed of a mixture of LSCF powder (40 wt %), ground PyrexTM beaker
glass (50%), sodium aluminum oxide (A12O3"Na2O; 10%) and water [2]. Paste was applied to
the outside ring of the tube and the membrane was pressed firmly on top of the tube to form the
seal. Additional paste was added to the outside edge of the tube and membrane interface to
assure a gas-tight seal. After drying, the excess paste from the seal was polished off using
Struers 800-grit SiC polishing paper.
The sealed tube and membrane were encased in a 1.5" OD alumina tube, which was
sealed on both the feed and permeate side as to not let air seep in during experimentation. All
gases used during heating and permeation are of industrial grade purity (99.9%). The system
was heated at a rate of 1 C/min to 900 C. During heating, the feed side of the dual-phase
membrane was allowed to heat in stagnant air, as to not starve the perovskite material of oxygen.
100 ml/min of CO2 was fed to the membrane on the permeate/sweep side to limit decomposition
of the carbonates. After allowing the system to remain at 900 C for one hour to allow the seal9
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Lin, Jerry. Dual Phase Membrane for High Temperature CO2 Separation, report, June 30, 2007; United States. (https://digital.library.unt.edu/ark:/67531/metadc927393/m1/9/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.