Removal of sulfur at high temperatures using iron-based sorbents supported on fine coal ash

Wei Xie, Liping Chang, Dehai Wang, Kechang Xie, Terry Wall, Jianglong Yu

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68 Citations (Scopus)

Abstract

This paper deals with the simultaneous removal of H2S and COS in the temperature range of 400-650 °C at 1 bar by using iron-based sorbents. The iron-based sorbents were prepared using iron oxide and cerium oxide with coal fine ash as the support. Simulated coal gas was used in the sulfidation experiments and 5% O2 in N2 gas was used for regeneration of sorbents. Both sulfidation and regeneration experiments have been carried out using a fixed-bed quartz reactor. The product gases were analyzed using a GC equipped with a TCD and a FPD. The results demonstrated that both H2S and COS can be effectively reduced using the iron-based sorbents supported on fine coal ash. XRD analysis shows that Fe1-xS phase has formed during sulfidation indicating a high sulfur capacity of the sorbent. The mechanism of the removal of COS simultaneously with H2S is also discussed.

Original languageEnglish
Pages (from-to)868-873
Number of pages6
JournalFuel
Volume89
Issue number4
DOIs
Publication statusPublished - Apr 2010
Externally publishedYes

Keywords

  • COS
  • Hot coal gas desulfurization
  • Hydrogen sulfide
  • Iron-based sorbents
  • Sorbent support

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