Study on speciation of HgCl2 supported over activated carbon in simulated flue gases by temperature-programmed decomposition desorption mass spectrometry

Shengji Wu, Risa Katayama, Wei Yang, Azhar Uddin, Eiji Sasaoka

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

HgCl2 that was homogenously dispersed over activated carbon was prepared by an HCl solution method (HgCl2(HCl)/AC), in the present study. The speciation of HgCl2(HCl)/AC in simulated flue gases was further investigated by a temperature-programmed decomposition desorption mass spectroscopy method, to clarify its transformation mechanism. It was found that HgCl2 sublimation occurred after Hg-H2O pretreatment, evidenced by the disappearance of the desorption peak of HgCl2 at 80 °C. After Hg-H2O pretreatment, new species of HgCl2 were formed, as confirmed by similar peak intensities of HgCl2 at mass numbers 270 and 272 at 335 °C. The SO2-H2O or H2S-H2O pretreatment helped stabilize the HgCl2 species supported over the AC, as evidenced by the weaker desorption peak of HgCl2 at around 80 °C. For the HgCl2(HCl)/AC pretreated with SO2-H2O, four desorption peaks of mercury were found, at 280, 335, 380 and 480 °C, indicating that new mercury compounds were formed during pretreatment or the TPDD process. The mercury desorbed at 280 °C was derived from a mercury complex of [HgCl]2SO4⋯A-C, while the mercury desorbed at 480 °C resulted from HgSO4. Some HgO species might be formed and stabilized over the AC during the TPDD process, corresponding to two mercury desorption peaks at 335 and 380 °C. After the pretreatment of HgCl2(HCl)/AC with H2S-H2O, some HgCl2 were transformed to HgS and HgO species, as evidenced by the mercury desorption peaks at 280, 305 and 380 °C.

Original languageEnglish
Pages (from-to)69-75
Number of pages7
JournalFuel
Volume219
DOIs
Publication statusPublished - May 1 2018

Fingerprint

Mercuric Chloride
Flue gases
Activated carbon
Mass spectrometry
Desorption
Decomposition
Mercury
Temperature
Mercury compounds
Sublimation
Spectroscopy
Mercury Compounds

Keywords

  • Flue gases
  • HgCl
  • Mechanism
  • Mercury species
  • Temperature-programmed decomposition desorption mass spectroscopy method

ASJC Scopus subject areas

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

Cite this

Study on speciation of HgCl2 supported over activated carbon in simulated flue gases by temperature-programmed decomposition desorption mass spectrometry. / Wu, Shengji; Katayama, Risa; Yang, Wei; Uddin, Azhar; Sasaoka, Eiji.

In: Fuel, Vol. 219, 01.05.2018, p. 69-75.

Research output: Contribution to journalArticle

@article{f85e5a6087bb41c1959f96bb419e4cd1,
title = "Study on speciation of HgCl2 supported over activated carbon in simulated flue gases by temperature-programmed decomposition desorption mass spectrometry",
abstract = "HgCl2 that was homogenously dispersed over activated carbon was prepared by an HCl solution method (HgCl2(HCl)/AC), in the present study. The speciation of HgCl2(HCl)/AC in simulated flue gases was further investigated by a temperature-programmed decomposition desorption mass spectroscopy method, to clarify its transformation mechanism. It was found that HgCl2 sublimation occurred after Hg-H2O pretreatment, evidenced by the disappearance of the desorption peak of HgCl2 at 80 °C. After Hg-H2O pretreatment, new species of HgCl2 were formed, as confirmed by similar peak intensities of HgCl2 at mass numbers 270 and 272 at 335 °C. The SO2-H2O or H2S-H2O pretreatment helped stabilize the HgCl2 species supported over the AC, as evidenced by the weaker desorption peak of HgCl2 at around 80 °C. For the HgCl2(HCl)/AC pretreated with SO2-H2O, four desorption peaks of mercury were found, at 280, 335, 380 and 480 °C, indicating that new mercury compounds were formed during pretreatment or the TPDD process. The mercury desorbed at 280 °C was derived from a mercury complex of [HgCl]2SO4⋯A-C, while the mercury desorbed at 480 °C resulted from HgSO4. Some HgO species might be formed and stabilized over the AC during the TPDD process, corresponding to two mercury desorption peaks at 335 and 380 °C. After the pretreatment of HgCl2(HCl)/AC with H2S-H2O, some HgCl2 were transformed to HgS and HgO species, as evidenced by the mercury desorption peaks at 280, 305 and 380 °C.",
keywords = "Flue gases, HgCl, Mechanism, Mercury species, Temperature-programmed decomposition desorption mass spectroscopy method",
author = "Shengji Wu and Risa Katayama and Wei Yang and Azhar Uddin and Eiji Sasaoka",
year = "2018",
month = "5",
day = "1",
doi = "10.1016/j.fuel.2018.01.069",
language = "English",
volume = "219",
pages = "69--75",
journal = "Fuel",
issn = "0016-2361",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Study on speciation of HgCl2 supported over activated carbon in simulated flue gases by temperature-programmed decomposition desorption mass spectrometry

AU - Wu, Shengji

AU - Katayama, Risa

AU - Yang, Wei

AU - Uddin, Azhar

AU - Sasaoka, Eiji

PY - 2018/5/1

Y1 - 2018/5/1

N2 - HgCl2 that was homogenously dispersed over activated carbon was prepared by an HCl solution method (HgCl2(HCl)/AC), in the present study. The speciation of HgCl2(HCl)/AC in simulated flue gases was further investigated by a temperature-programmed decomposition desorption mass spectroscopy method, to clarify its transformation mechanism. It was found that HgCl2 sublimation occurred after Hg-H2O pretreatment, evidenced by the disappearance of the desorption peak of HgCl2 at 80 °C. After Hg-H2O pretreatment, new species of HgCl2 were formed, as confirmed by similar peak intensities of HgCl2 at mass numbers 270 and 272 at 335 °C. The SO2-H2O or H2S-H2O pretreatment helped stabilize the HgCl2 species supported over the AC, as evidenced by the weaker desorption peak of HgCl2 at around 80 °C. For the HgCl2(HCl)/AC pretreated with SO2-H2O, four desorption peaks of mercury were found, at 280, 335, 380 and 480 °C, indicating that new mercury compounds were formed during pretreatment or the TPDD process. The mercury desorbed at 280 °C was derived from a mercury complex of [HgCl]2SO4⋯A-C, while the mercury desorbed at 480 °C resulted from HgSO4. Some HgO species might be formed and stabilized over the AC during the TPDD process, corresponding to two mercury desorption peaks at 335 and 380 °C. After the pretreatment of HgCl2(HCl)/AC with H2S-H2O, some HgCl2 were transformed to HgS and HgO species, as evidenced by the mercury desorption peaks at 280, 305 and 380 °C.

AB - HgCl2 that was homogenously dispersed over activated carbon was prepared by an HCl solution method (HgCl2(HCl)/AC), in the present study. The speciation of HgCl2(HCl)/AC in simulated flue gases was further investigated by a temperature-programmed decomposition desorption mass spectroscopy method, to clarify its transformation mechanism. It was found that HgCl2 sublimation occurred after Hg-H2O pretreatment, evidenced by the disappearance of the desorption peak of HgCl2 at 80 °C. After Hg-H2O pretreatment, new species of HgCl2 were formed, as confirmed by similar peak intensities of HgCl2 at mass numbers 270 and 272 at 335 °C. The SO2-H2O or H2S-H2O pretreatment helped stabilize the HgCl2 species supported over the AC, as evidenced by the weaker desorption peak of HgCl2 at around 80 °C. For the HgCl2(HCl)/AC pretreated with SO2-H2O, four desorption peaks of mercury were found, at 280, 335, 380 and 480 °C, indicating that new mercury compounds were formed during pretreatment or the TPDD process. The mercury desorbed at 280 °C was derived from a mercury complex of [HgCl]2SO4⋯A-C, while the mercury desorbed at 480 °C resulted from HgSO4. Some HgO species might be formed and stabilized over the AC during the TPDD process, corresponding to two mercury desorption peaks at 335 and 380 °C. After the pretreatment of HgCl2(HCl)/AC with H2S-H2O, some HgCl2 were transformed to HgS and HgO species, as evidenced by the mercury desorption peaks at 280, 305 and 380 °C.

KW - Flue gases

KW - HgCl

KW - Mechanism

KW - Mercury species

KW - Temperature-programmed decomposition desorption mass spectroscopy method

UR - http://www.scopus.com/inward/record.url?scp=85041471576&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85041471576&partnerID=8YFLogxK

U2 - 10.1016/j.fuel.2018.01.069

DO - 10.1016/j.fuel.2018.01.069

M3 - Article

VL - 219

SP - 69

EP - 75

JO - Fuel

JF - Fuel

SN - 0016-2361

ER -