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Sulfidation and reduction of zinc titanate and zinc oxide sorbents for injection in gasifier exit ducts

Technical Report ·
DOI:https://doi.org/10.2172/464519· OSTI ID:464519
 [1]; ;  [1]; ; ; ;  [2]
  1. Tufts Univ., Medford, MA (United States). Dept. of Chemical Engineering
  2. CeraMem Corp., Waltham, MA (United States)
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The sulfidation reaction kinetics of fine particles of zinc titanate and zinc oxide with H{sub 2}S were studied in order to test the potential of the sorbent injection hot-gas desulfurization process. Fine sorbent particles with diameter between 0.3 and 60 {mu}m were sulfided with H{sub 2}S and/or reduced with H{sub 2} in a laminar flow reactor over the temperature range of 500-900{degrees}C. Sulfidation/reduction conversion was compared for different particle sizes and sorbents with various porosities and atomic ratios of Zn and Ti. In reduction of ZnO with H{sub 2} and without H{sub 2}S, significant amount of Zn was formed and vaporized, while the presence of H{sub 2}S suppressed elemental Zn formation. This suggests that H{sub 2}S may suppress the surface reduction of ZnO and/or gaseous Zn may react with H{sub 2}S homogeneously and form fine particles of ZnS. Formation and vaporization of elemental Zn from zinc titanate sorbents was slower than from zinc oxide with and without H{sub 2}S.
Research Organization:
CeraMem Corp., Waltham, MA (United States)
Sponsoring Organization:
USDOE Office of Energy Research, Washington, DC (United States)
DOE Contract Number:
FG02-92ER81364
OSTI ID:
464519
Report Number(s):
DOE/ER/81364--6; CONF-950952--12; ON: DE97003450
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
ADSORBENTS
CHEMICAL REACTIONS
EXPERIMENTAL DATA
HOT GAS CLEANUP
HYDROGEN
HYDROGEN SULFIDES
REDUCTION
SULFIDATION
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TITANATES
ZINC COMPOUNDS
ZINC OXIDES
ZINC SULFIDES