The mechanism of coal gas desulfurization by iron oxide sorbents

Yi Hsing Lin; Yen Chiao Chen; Hsin Chu

doi:10.1016/j.chemosphere.2014.11.010

The mechanism of coal gas desulfurization by iron oxide sorbents

Yi Hsing Lin, Yen Chiao Chen, Hsin Chu

Department of Environmental Engineering

Research output: Contribution to journal › Article › peer-review

37 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 language	English
Pages (from-to)	62-67
Number of pages	6
Journal	Chemosphere
Volume	121
DOIs	https://doi.org/10.1016/j.chemosphere.2014.11.010
Publication status	Published - 2015 Feb 1

All Science Journal Classification (ASJC) codes

Environmental Engineering
Environmental Chemistry
Chemistry(all)
Pollution
Health, Toxicology and Mutagenesis

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10.1016/j.chemosphere.2014.11.010

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title = "The mechanism of coal gas desulfurization by iron oxide sorbents",

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.",

author = "Lin, {Yi Hsing} and Chen, {Yen Chiao} and Hsin Chu",

note = "Funding Information: This study was funded in part by the National Science Council, Republic of China , under Grant NSC 102-3113-P-006-002. Publisher Copyright: {\textcopyright} 2014 Elsevier Ltd.",

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doi = "10.1016/j.chemosphere.2014.11.010",

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AU - Chen, Yen Chiao

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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The mechanism of coal gas desulfurization by iron oxide sorbents

Abstract

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