Control of high level radioactive waste-glass melters. Part 6, Noble metal catalyzed formic acid decomposition, and formic acid/denitration

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A necessary step in Defense Waste Processing Facility (DWPF) melter feed preparation for the immobilization of High Level Radioactive Waste (HLW) is reduction of Hg(II) to Hg(0), permitting steam stripping of the Hg. Denitrition and associated NOx evolution is a secondary effect of the use of formic acid as the mercury-reducing agent. Under certain conditions the presence of transition or noble metals can result in significant formic acid decomposition, with associated CO{sub 2} and H{sub 2} evolution. These processes can result in varying redox properties of melter feed, and varying sequential gaseous evolution of oxidants and hydrogen. Electrochemical methods for … continued below

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25 p.

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Bickford, D. F.; Coleman, C. J.; Hsu, C. L. W. & Eibling, R. E. December 31, 1990.

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A necessary step in Defense Waste Processing Facility (DWPF) melter feed preparation for the immobilization of High Level Radioactive Waste (HLW) is reduction of Hg(II) to Hg(0), permitting steam stripping of the Hg. Denitrition and associated NOx evolution is a secondary effect of the use of formic acid as the mercury-reducing agent. Under certain conditions the presence of transition or noble metals can result in significant formic acid decomposition, with associated CO{sub 2} and H{sub 2} evolution. These processes can result in varying redox properties of melter feed, and varying sequential gaseous evolution of oxidants and hydrogen. Electrochemical methods for monitoring the competing processes are discussed. Laboratory scale techniques have been developed for simulating the large-scale reactions, investigating the relative effectiveness of the catalysts, and the effectiveness of catalytic poisons. The reversible nitrite poisoning of formic acid catalysts is discussed.

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25 p.

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OSTI; NTIS; INIS; GPO Dep.

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  • Symposium on nuclear waste management,Cincinnati, OH (United States),28 Apr - 2 May 1991

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  • Other: DE92009758
  • Report No.: WSRC-MS--90-363
  • Report No.: CONF-9104256--10-Pt.6
  • Grant Number: AC09-89SR18035
  • Office of Scientific & Technical Information Report Number: 10131083
  • Archival Resource Key: ark:/67531/metadc1317623

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  • December 31, 1990

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  • Nov. 3, 2018, 11:47 a.m.

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  • Nov. 9, 2018, 1:17 p.m.

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Bickford, D. F.; Coleman, C. J.; Hsu, C. L. W. & Eibling, R. E. Control of high level radioactive waste-glass melters. Part 6, Noble metal catalyzed formic acid decomposition, and formic acid/denitration, article, December 31, 1990; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1317623/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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