Mechanism and kinetics of H{sub 2}S-CO{sub 2} mixture dissociation in plasma of a microwave-discharge

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Several experimental and theoretical investigations of plasma-chemical H{sub 2}S dissociation have addressed the effects of different gas compositions and various types of discharges (such as microwave, radio-frequency, arc, and glidarc discharges). There are two primary reasons for these investigations: (1) the plasma-chemical process recovers both hydrogen (a valuable chemical reagent) and sulfur from H{sub 2}S (as in the conventional Claus process), and (2) plasmas can be used for selectively decomposing H{sub 2}S in air and other exhaust gases for environmental-control purposes. These studies have shown that, in plasmas with strong centrifugal force fields, H{sub 2}S can be dissociated with high ... continued below

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7 p.

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Potapkin, B.V.; Strelkova, M.I. & Fridman, A.A. August 1, 1995.

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Several experimental and theoretical investigations of plasma-chemical H{sub 2}S dissociation have addressed the effects of different gas compositions and various types of discharges (such as microwave, radio-frequency, arc, and glidarc discharges). There are two primary reasons for these investigations: (1) the plasma-chemical process recovers both hydrogen (a valuable chemical reagent) and sulfur from H{sub 2}S (as in the conventional Claus process), and (2) plasmas can be used for selectively decomposing H{sub 2}S in air and other exhaust gases for environmental-control purposes. These studies have shown that, in plasmas with strong centrifugal force fields, H{sub 2}S can be dissociated with high specific rates and low specific energies of dissociation (0.8-1.0 eV/molecule). Furthermore, acid gases from both natural deposits and those produced in industrial processes often contain significant amounts of CO{sub 2} in addition to H{sub 2}S. Unfortunately, CO{sub 2}can have substantial, negative impacts on H{sub 2}S dissociation. In particular, CO{sub 2} can significantly increase the process energy consumption and affect by-product composition. However, until this study, the influence of CO{sub 2} on the plasma-chemical dissociation of H{sub 2}S has not been studied in detail. This study presents the results of a theoretical analysis of an experimental determination of the CO{sub 2} effects over a wide range of CO{sub 2} concentrations. This analysis identified the primary chemical reaction mechanism and the kinetics for the plasma-chemical dissociation of H{sub 2}S, including the generation of two undesirable by-products, SO{sub 2} and COS.

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7 p.

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OSTI as DE95015720

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  • 12. international symposium on plasma chemistry, Minneapolis, MN (United States), 21-25 Aug 1995

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  • Other: DE95015720
  • Report No.: ANL/ES/CP--86824
  • Report No.: CONF-950875--4
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 100122
  • Archival Resource Key: ark:/67531/metadc621247

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  • August 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Dec. 14, 2015, 12:01 p.m.

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Potapkin, B.V.; Strelkova, M.I. & Fridman, A.A. Mechanism and kinetics of H{sub 2}S-CO{sub 2} mixture dissociation in plasma of a microwave-discharge, article, August 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc621247/: accessed July 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.