High temperature membranes for H{sub 2}S and SO{sub 2} separations. Quarterly progress report, April 1, 1993--June 30, 1993

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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 has been 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 … continued below

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14 p.

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Winnick, J. November 1, 1993.

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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 has been 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 bum 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 90wt%K{sub 2}S{sub 2}O{sub 7}/lOwt%V{sub 2}O{sub 5} mixture.

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14 p.

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OSTI as DE94001977; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

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  • November 1, 1993

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  • Oct. 12, 2018, 6:44 a.m.

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  • Nov. 28, 2024, 1:33 a.m.

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Winnick, J. High temperature membranes for H{sub 2}S and SO{sub 2} separations. Quarterly progress report, April 1, 1993--June 30, 1993, report, November 1, 1993; Atlanta, Georgia. (https://digital.library.unt.edu/ark:/67531/metadc1271952/: accessed July 18, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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