Control of kinetic decomposition in mixed conducting ion transport membranes
An ion transport, multi-component technology, applied in the field of dynamic decomposition control in mixed conduction ion transport membranes, can solve the problems of reducing oxygen penetration through the membrane, reducing oxygen penetration, etc.
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[0090] In the first exemplary preparation method, it can be prepared by the following method Figure 4A and 4B Wafer as described in: the green ceramic precursor layers of dense active film layers 305 and 307, outer support layers 301 and 303, support layer forming support ribs 321 and 329, and slotted support layer 309 are assembled to form a green wafer . The green wafer is fired to sinter and bond the wafer elements to form a complete wafer. The firing temperature can be in the range of 1000-1600°C, and the hold time at the maximum temperature can be in the range of 0.5-12 hours; the specific firing time and temperature profile are selected to achieve proper sintering and bonding of the components in the wafer. The properties of the green active film layers 305 and 307 are selected such that with the selected firing time and temperature profile used in the firing of the wafer a desired average particle size in the range of about 4 microns to about 20 microns is obtained i...
Embodiment 1
[0098] Prepared by suppressed powder preparation technology with (La 0.90 Ca 0.10 ) 1.00 FeO 3-z Membrane composed of z is the value that makes the compound charge neutral, wherein specific weight parts of each metal oxide or carbonate are stirred and milled together for 72 hours. The mixture of metal oxide and carbonate was calcined at 1200° C. for 10 hours in air, and then pulverized by stirring and grinding for 72 hours to form a powder. The surface area of 250 (250.0) grams is 2.0m 2 / g La 0.90 Ca 0.10 FeO 3 Powder and 250 grams of yttria partially stabilized tetragonal polycrystalline zirconia (Y-TZP) sphere media, 72.8 grams of reagent grade toluene, 18.2 grams of denatured ethanol (Synasol PM-509 from Ashland Chemical), and 1.25 grams of polyvinyl alcohol Butyraldehyde (PVB) dispersant (grade B-79 from Solutia) was added to a 1 liter density polyethylene (HDPE) tank. The slurry was placed on a paint mixer for 30 minutes to disperse the ceramic powder. Add pla...
Embodiment 2
[0101] A membrane prepared by the method of Example 1 was attached to an alumina tube with a Corning 1720 glass ring between the membrane and the alumina tube. The molar composition of this Corning 1720 glass is 58.4% SiO 2 , 12.0% Al 2 o 3 , 3.54% B 2 o 3 , 6.59% CaO, 18.3% MgO and 0.994% Na 2 O. The composition of the film is (La 0.90 Ca 0.10 ) 1.00 FeO 3-z, where z is the value that makes the compound charge neutral. The film samples were planar flakes with a diameter of 0.75 inches, a nominal thickness of 225 μm, and an average particle size of 4 μm. With He flowing at 200 sccm on the permeate side of the membrane, the membrane assembly was heated at 1°C / min to 950°C and the temperature and He flow rate were maintained for 3 days to soften the glass and form a seal. After this, use 200sccm of 75% H 2 , 17% CO 2 and 8% CH 4 A mixture of (all in mole %) was used instead of He and 300 sccm of air was introduced on the opposite side of the membrane. The final fl...
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