High temperature membranes for H[sub 2]S and SO[sub 2] separations
Successful removal of SO[sub x] from flue gas depends on the development of a membrane able to achieve a current density of 50 mA/cm[sup 2] at a total voltage of approximately 1V. Flooding of electrode hasbeen identified as a problem, leading to increasing polarization over time. The resulting reduction of surface area also tends to limit the mass transfer flux, reducing the efficiency of the cell. To reduce flooding, new materials and techniques of manufacture will be investigated, in the attempt to produce a ceramic membrane of approximately 50% theoretical density. This membrane must have proper pore size distribution to ensure sufficient capillary force to prevent impregnated electrolyte from flooding electrodes, and subsequently drying the ceramic membrane. Various methods of matrix production were studied this quarter: tape casting, pressing and sintering, and slip casting. Each will be discussed in turn. Electrolyte introduction to the cell is a continuing problem. The development of a method is still being investigated. Ideally, the electrolyte would be introduced as powder with binder in a green body. This binder would burn away at temperatures of approximately 300[degrees]C, leaving pure electrolyte to melt and complete the ionic path necessary for the electrochemical cell. The electrolyte used this quarter was, exclusively, a 90 wt % K[sub 2]S[sub 2]O[sub 7]/10 wt % V[sub 2]O[sub 5] mixture.
- Research Organization:
- Georgia Inst. of Tech., Atlanta, GA (United States). School of Chemical Engineering
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90293
- OSTI ID:
- 6673808
- Report Number(s):
- DOE/PC/90293-T8; ON: DE93012456
- Country of Publication:
- United States
- Language:
- English
Similar Records
High temperature membranes for H{sub 2}S and SO{sub 2} separations. Quarterly progress report, April 1, 1993--June 30, 1993
High temperature membranes for H sub 2 S and SO sub 2 separations
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN SULFIDES
SEPARATION PROCESSES
MEMBRANES
FABRICATION
SULFUR DIOXIDE
CERAMICS
CURRENT DENSITY
ELECTRIC POTENTIAL
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROLYTES
MASS TRANSFER
MICROSTRUCTURE
POROSITY
PROGRESS REPORT
SURFACE AREA
CHALCOGENIDES
CRYSTAL STRUCTURE
DOCUMENT TYPES
HYDROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
400105* - Separation Procedures