Abstract
Thin dense yttria-stabilized-zirconia (YSZ)/Pd composite (dual-phase) membranes were fabricated on porous YSZ membranes by a new approach that combines the reservoir method and chemical vapor deposition (CVD) technique. A thin porous YSZ layer was coated on a porous alumina support by dip coating the YSZ suspension. A continuous Pd phase was formed inside pores of the YSZ layer by the reservoir method. The residual pores of the YSZ/Pd layer were plugged with yttria/zirconia by CVD to ensure the gas tightness of the membranes. The oxygen-permeation fluxes through these composite (dual-phase) membranes, measured in sire in the CVD reactor, are 2.0 x 10-8 and 4.8 x 10-8 mol/cm2. s at 1,050°C when air and oxygen are used as the permeate gases, respectively. These oxygen-permeation values are about I order of magnitude higher than those of pure YSZ membranes prepared under similar conditions. The apparent activation energies for oxygen permeation at 900-1,050°C are 193 kJ/mol for thin YSZ/Pd composite (dual-phase) membranes and 124 kJ/mol for pure YSZ membranes. These results are explained in terms of relative importance of various masstransfer steps for oxygen permeation and microstructure of the YSZ/Pd composite membranes prepared by this technique.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1521-1529 |
| Number of pages | 9 |
| Journal | AICHE Journal |
| Volume | 46 |
| Issue number | 8 |
| State | Published - Aug 2000 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Biotechnology
- Chemical Engineering(all)
- Mechanical Engineering
- Environmental Engineering
- Polymers and Plastics
Cite this
Synthesis and oxygen-permeation properties of thin YSZ/Pd composite membranes. / Kim, Jinsoo; Lin, Jerry.
In: AICHE Journal, Vol. 46, No. 8, 08.2000, p. 1521-1529.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis and oxygen-permeation properties of thin YSZ/Pd composite membranes
AU - Kim, Jinsoo
AU - Lin, Jerry
PY - 2000/8
Y1 - 2000/8
N2 - Thin dense yttria-stabilized-zirconia (YSZ)/Pd composite (dual-phase) membranes were fabricated on porous YSZ membranes by a new approach that combines the reservoir method and chemical vapor deposition (CVD) technique. A thin porous YSZ layer was coated on a porous alumina support by dip coating the YSZ suspension. A continuous Pd phase was formed inside pores of the YSZ layer by the reservoir method. The residual pores of the YSZ/Pd layer were plugged with yttria/zirconia by CVD to ensure the gas tightness of the membranes. The oxygen-permeation fluxes through these composite (dual-phase) membranes, measured in sire in the CVD reactor, are 2.0 x 10-8 and 4.8 x 10-8 mol/cm2. s at 1,050°C when air and oxygen are used as the permeate gases, respectively. These oxygen-permeation values are about I order of magnitude higher than those of pure YSZ membranes prepared under similar conditions. The apparent activation energies for oxygen permeation at 900-1,050°C are 193 kJ/mol for thin YSZ/Pd composite (dual-phase) membranes and 124 kJ/mol for pure YSZ membranes. These results are explained in terms of relative importance of various masstransfer steps for oxygen permeation and microstructure of the YSZ/Pd composite membranes prepared by this technique.
AB - Thin dense yttria-stabilized-zirconia (YSZ)/Pd composite (dual-phase) membranes were fabricated on porous YSZ membranes by a new approach that combines the reservoir method and chemical vapor deposition (CVD) technique. A thin porous YSZ layer was coated on a porous alumina support by dip coating the YSZ suspension. A continuous Pd phase was formed inside pores of the YSZ layer by the reservoir method. The residual pores of the YSZ/Pd layer were plugged with yttria/zirconia by CVD to ensure the gas tightness of the membranes. The oxygen-permeation fluxes through these composite (dual-phase) membranes, measured in sire in the CVD reactor, are 2.0 x 10-8 and 4.8 x 10-8 mol/cm2. s at 1,050°C when air and oxygen are used as the permeate gases, respectively. These oxygen-permeation values are about I order of magnitude higher than those of pure YSZ membranes prepared under similar conditions. The apparent activation energies for oxygen permeation at 900-1,050°C are 193 kJ/mol for thin YSZ/Pd composite (dual-phase) membranes and 124 kJ/mol for pure YSZ membranes. These results are explained in terms of relative importance of various masstransfer steps for oxygen permeation and microstructure of the YSZ/Pd composite membranes prepared by this technique.
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M3 - Article
VL - 46
SP - 1521
EP - 1529
JO - AICHE Journal
JF - AICHE Journal
SN - 0001-1541
IS - 8
ER -