Effects of several trace contaminants on fuel cell performance. [Theoretical study]

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The electrochemical reactivity of various trace contaminants in coal gas, i.e., Hg/HgS, PbS, CdS, Sn/SnCl/sub 2//SnCl/sub 4/, and TiO/sub 2/, in coal gas at the nickel anode and the nickel oxide cathode in a molten carbonate fuel cell have been examined thermodynamically. Calculations indicate that only SnCl/sub 4/ would undergo reduction at the cathode to SnCl/sub 2/. Other species would remain intact. Contaminants such as H/sub 2/S/SO/sub 2/ and HCl have also been included in the calculation. The results are consistent with the limited observations. Possible chemical interactions between contaminants and electrodes or electrolytes have been examined. Reactions of Sn/sup ... continued below

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Pages: 29

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Park, S.M. & O'Brien, T.J. August 1, 1980.

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Description

The electrochemical reactivity of various trace contaminants in coal gas, i.e., Hg/HgS, PbS, CdS, Sn/SnCl/sub 2//SnCl/sub 4/, and TiO/sub 2/, in coal gas at the nickel anode and the nickel oxide cathode in a molten carbonate fuel cell have been examined thermodynamically. Calculations indicate that only SnCl/sub 4/ would undergo reduction at the cathode to SnCl/sub 2/. Other species would remain intact. Contaminants such as H/sub 2/S/SO/sub 2/ and HCl have also been included in the calculation. The results are consistent with the limited observations. Possible chemical interactions between contaminants and electrodes or electrolytes have been examined. Reactions of Sn/sup 2 +/, HgS, H/sub 2/S, and HCl with the nickel anode have negative free energies. Mercury would interact physically with the anode by forming an alloy. Reactions of Sn, SnCl/sub 2/, H/sub 2/S, and HCl with the nickel oxide cathode also have negative free energies. Reactions of Sn/sup 2 +/, HCl, H/sub 2/S, and SO/sub 2/ with carbonates have large negative free energies. Born's model of ion transfer was used to calculate the free energy charge for the transfer of ions from aqueous solution to the molten carbonate solution.

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Pages: 29

Notes

NTIS, PC A03/MF A01.

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  • Report No.: DOE/METC/RI-80/16
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 5030267
  • Archival Resource Key: ark:/67531/metadc1054927

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 1, 1980

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 25, 2018, 4:22 p.m.

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Park, S.M. & O'Brien, T.J. Effects of several trace contaminants on fuel cell performance. [Theoretical study], report, August 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1054927/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.