Characteristics of the mercury vapor removal from coal combustion flue gas by activated carbon using H2S

Takefumi Morimoto, Shengji Wu, Md Azhar Uddin, Eiji Sasaoka

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Removal of Hg0 vapor from the simulated coal combustion flue gases with a commercial activated carbon was investigated using H2S. This method is based on the reaction of H2S and Hg over the adsorbents. The Hg0 removal experiments were carried out in a conventional flow type packed bed reactor system in the temperature range of 80-150 °C using simulated flue gases having the composition of Hg 0 (4.9 ppb), H2S (0-20 ppm), SO2 (0-487 ppm), CO2 (10%), H2O (0-15%), O2 (0-5%), N 2 (balance gas). The following results were obtained: in the presence of both H2S and SO2, Hg removal was favored at lower temperatures (80-100 °C). At 150 °C, presence of O2 was indispensable for Hg0 removal from H2S-SO2 flue gas system. It is suggested that the partial oxidation of H2S with O2 to elemental sulfur (H2S+1/2O2=S ad+H2O) and the Clause reaction (SO2+2H 2S=3Sad+2H2O) may contribute to the Hg 0 removal over activated carbon by the following reaction: S ad+Hg=HgS. The formation of elemental sulfur on the activated carbon was confirmed by a visual observation.

Original languageEnglish
Pages (from-to)1968-1974
Number of pages7
JournalFuel
Volume84
Issue number14-15
DOIs
Publication statusPublished - Oct 1 2005

Keywords

  • Activated carbon
  • Coal combustion flue gas
  • H S
  • Removal of mercury vapor

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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