Feasibility study on high-temperature sorption of hydrogen sulfide by natural soils

Chemosphere
Tzu-Hsing KoJeou-Jen Tseng

Abstract

In this study, seven natural soils were tested for the sorption of hydrogen sulfide from coal gasification gas at high temperature. Results indicate that the LP natural soil has the best performance and the highest sulfur sorption capacity. After extracting free iron oxides, most natural soils have no sorption efficiency. The free iron oxides, therefore, proved to be the major components that react with hydrogen sulfide to form iron sulfides. The sulfur sorption capacity, either determined by EA or breakthrough time, is very close to the theoretical value based on the stoichiometric calculation with the content of free iron oxides. Moreover, the presence of CO is a positive effect while H2 is a negative effect. This can be explained via the water-shift reaction. On the basis of the results of temperature-programmed sulfidation (TPS), the starting temperature for the sorption of hydrogen sulfide is between 623-673 K. From the analyses of temperature-programmed oxidation (TPO) and XPS, the iron polysulfides are the major products and approximately 90% regeneration efficiency can be theoretically achieved while the temperature is controlled higher than 813 K. In the regeneration tests, the results show that the LP natural soil can...Continue Reading

References

Jun 6, 2003·Environmental Science & Technology·Kirk J CantrellEdward C Thornton
Oct 30, 2004·Journal of Hazardous Materials·T H KoT K Tseng
Dec 29, 2004·Chemosphere·Tzu-Hsing KoLung-Kai Chaung
May 25, 2005·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·T H Ko, H Chu

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Citations

Nov 19, 2013·Chemosphere·Hongyun HuHong Yao
Nov 28, 2006·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Tzu-Hsing KoChien-Jen Hung
Dec 2, 2014·Chemosphere·Yi-Hsing LinHsin Chu

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