The mechanism of coal gas desulfurization by iron oxide sorbents

Yi Hsing Lin, Yen Chiao Chen, Hsin Chu

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

This study aims to understand the roles of hydrogen and carbon monoxide during the desulfurization process in a coal gasification system that H2S of the syngas was removed by Fe2O3/SiO2 sorbents. The Fe2O3/SiO2 sorbents were prepared by incipient wetness impregnation. Through the breakthrough experiments and Fourier transform infrared spectroscopy analyses, the overall desulfurization mechanism of the Fe2O3/SiO2 sorbents was proposed in this study. The results show that the major reaction route is that Fe2O3 reacts with H2S to form FeS, and the existence of CO and H2 in the simulated gas significantly affects equilibrium concentrations of H2S and COS. The formation of COS occurs when the feeding gas is blended with CO and H2S, or CO2 and H2S. The pathways in the formation of products from the desulfurization process by the reaction of Fe2O3 with H2S have been successfully established.

Original languageEnglish
Pages (from-to)62-67
Number of pages6
JournalChemosphere
Volume121
DOIs
Publication statusPublished - 2015 Feb 1

Fingerprint

Coal gas
Coal
Carbon Monoxide
Desulfurization
Sorbents
Iron oxides
iron oxide
Gases
coal
FTIR spectroscopy
gas
carbon monoxide
Coal gasification
hydrogen
Fourier Transform Infrared Spectroscopy
Impregnation
Carbon monoxide
Fourier transform infrared spectroscopy
Hydrogen
experiment

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemistry(all)
  • Medicine(all)

Cite this

Lin, Yi Hsing ; Chen, Yen Chiao ; Chu, Hsin. / The mechanism of coal gas desulfurization by iron oxide sorbents. In: Chemosphere. 2015 ; Vol. 121. pp. 62-67.
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The mechanism of coal gas desulfurization by iron oxide sorbents. / Lin, Yi Hsing; Chen, Yen Chiao; Chu, Hsin.

In: Chemosphere, Vol. 121, 01.02.2015, p. 62-67.

Research output: Contribution to journalArticle

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AU - Chu, Hsin

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AB - This study aims to understand the roles of hydrogen and carbon monoxide during the desulfurization process in a coal gasification system that H2S of the syngas was removed by Fe2O3/SiO2 sorbents. The Fe2O3/SiO2 sorbents were prepared by incipient wetness impregnation. Through the breakthrough experiments and Fourier transform infrared spectroscopy analyses, the overall desulfurization mechanism of the Fe2O3/SiO2 sorbents was proposed in this study. The results show that the major reaction route is that Fe2O3 reacts with H2S to form FeS, and the existence of CO and H2 in the simulated gas significantly affects equilibrium concentrations of H2S and COS. The formation of COS occurs when the feeding gas is blended with CO and H2S, or CO2 and H2S. The pathways in the formation of products from the desulfurization process by the reaction of Fe2O3 with H2S have been successfully established.

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