Role of H2O in oxidative regeneration of ZnS formed from high-temperature desulfurization ZnO sorbent

E. Sasaoka, M. Hatori, N. Sada, M. A. Uddin

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Abstract

To develop an easily regenerable zinc oxide high-temperature desulfurization sorbent, the role of H2O in the course of oxidative regeneration of zinc sulfide in the presence of O2 were studied using ZnO without support material as a sorbent. Oxidative regeneration of ZnS in the presence of water vapor was examined using TPR technique and H218O. From this study, the following results were obtained: ZnS was converted to SO2 and H2 by H2O in the absence of O2 at high temperature (> ca. 600 °C); in the first step in the oxidative regeneration, ZnS predominantly reacted with H2O more than O2; the SO2 formed from ZnS contained oxygen from H2O. From the experimental results, it was found that the oxidative regeneration of ZnS in the presence of H2O and O2 can be expressed by the following two equations: ZnS + 3H2O ⇆ ZnO + SO2 + 3H2; 3H2 + 3/2 O2 → 3H2O. In the absence of H2O or in the case of very low value of H2O/O2 concentration ratio, the following reaction also occurred: ZnS + 3/2 O2 → ZnO + SO2.

Original languageEnglish
Pages (from-to)3844-3848
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume39
Issue number10
Publication statusPublished - Oct 1 2000

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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