Fundamental study on decomposition characteristics of mercury compounds over solid powder by temperature-programmed decomposition desorption mass spectrometry

Shengji Wu, Azhar Uddin, Saori Nagano, Masaki Ozaki, Eiji Sasaoka

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Stabilities and/or decomposition characteristics of mercury compounds are important for the design of solid sorbents for mercury vapor removal from coal-derived flue gas and fuel gas. However, available data on the stability and decomposition behavior of mercury compounds are inadequate. The stability and/or decomposition behavior of mercury compounds, such as HgS (metacinnabar and cinnabar), HgO, HgSO4, HgCl2, and Hg 2Cl2, were investigated by the temperature-programmed decomposition and desorption technique using a mass spectrometer (TPDD-mass) method. The effects of solid diluents, such as quartz, SiC, Al2O 3, TiO2, or activated carbon (AC), on the decomposition characteristics were also studied by the TPDD-mass method. In particular, the stability and reactivity of mercury chloride (HgCl2) in coal combustion flue gas and coal-derived fuel gas conditions were examined. The following results were obtained: (1) the order of the main peak temperature of mercury evolution from the decomposition of the mercury compound diluted with quartz sand in He flow was as follows: HgS (metacinnabar) = HgO <HgS (cinnabar) <HgSO4; (2) HgSO4 was hydrolyzed with H2O; (3) HgO was reduced by SO2 in the presence of H 2O and O2; (4) HgCl2 and Hg2Cl 2 over SiO2 were more easily decomposed than the other mercury compounds; (5) Among the diluents of HgCl2, SiO2, SiC, Al2O3, TiO2, and AC, HgCl2 was most easily decomposed to Hg0 over SiO2; (6) AC as a diluent apparently stabilizes HgCl2; and (7) HgCl2 gas could be converted to Hg0 over quartz wool, Pyrex wool, ceramic (SiO2-Al2O3) wool, carbon fiber, and AC at high temperatures (>ca. 200 °C).

Original languageEnglish
Pages (from-to)144-153
Number of pages10
JournalEnergy and Fuels
Volume25
Issue number1
DOIs
Publication statusPublished - Jan 20 2011

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Mercury compounds
Mercury Compounds
Powders
Mass spectrometry
Desorption
Decomposition
Mercuric Chloride
Quartz
Coal
Gas fuels
Temperature
Mass spectrometers
Mercury
Flue gases
Mercury (metal)
Coal combustion
Sorbents
Activated carbon
Sand
Vapors

ASJC Scopus subject areas

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

Cite this

Fundamental study on decomposition characteristics of mercury compounds over solid powder by temperature-programmed decomposition desorption mass spectrometry. / Wu, Shengji; Uddin, Azhar; Nagano, Saori; Ozaki, Masaki; Sasaoka, Eiji.

In: Energy and Fuels, Vol. 25, No. 1, 20.01.2011, p. 144-153.

Research output: Contribution to journalArticle

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