Journal ArticleDOI
In situ x-ray absorption fine structure spectroscopy investigation of sulfur functional groups in coal during pyrolysis and oxidation
TLDR
In this paper, the behavior of all major sulfur forms during in situ high-temperature oxidation and pyrolysis was derived for two US bituminous coals and a low-rank Australian brown coal from least-squares analysis of sulfur K-edge X-ray absorption nearedge structure spectra taken at constant temperatures up to 600°C.Abstract:
Sulfur K-edge X-ray absorption near-edge structure (XANES) spectroscopy has been utilized to conduct the first direct characterization and quantification of sulfur functional groups in coal during in situ high-temperature oxidation and pyrolysis. The behavior of all major sulfur forms during such treatments was derived for two US bituminous coals and a low-rank Australian brown coal from least-squares analysis of sulfur K-edge XANES spectra taken at constant temperatures up to 600°C. During pyrolysis, pyrite began to convert to pyrrhotite at temperatures above 400°Cread more
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Sulfur in coals: A review of geochemistry and origins
TL;DR: In this article, a review of the evidence suggests that the variation of sulfur in coals is closely related to the depositional environments of coal seams, and the relationships between sulfur abundance in coal seams and depositional environment of coals were reviewed for cases from the U.S., China, China, U.K., Germany, Hungary, Turkey, Indonesia, and Brazil.
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The chemical forms of sulfur in coal: a review
TL;DR: A number of analytical methods have been developed for approximating the sulfur functional group compositions of coals as discussed by the authors, and some of these are destructive tests depending on pyrolysis or catalytic reduction to H 2 S or oxidation to SO 2.
Journal ArticleDOI
An Overview of Synchrotron Radiation Applications to Low Temperature Geochemistry and Environmental Science
Gordon E. Brown,Neil C. Sturchio +1 more
TL;DR: The availability of synchrotron radiation (SR) to the scientific community has literally revolutionized the way X-ray science is done in many disciplines, including low temperature geochemistry and environmental science.
Journal ArticleDOI
Quantitative analysis of sulfur functional groups in natural organic matter by XANES spectroscopy
Alain Manceau,Kathryn L. Nagy +1 more
TL;DR: In this paper, two new approaches to quantify sulfur functionalities in natural organic matter from S K-edge XANES spectroscopy are presented, one based on Gaussian and two arctangent functions, and the other based on linear combination fitting.
Journal ArticleDOI
Sulfurization of a carbon surface for vapor phase mercury removal – II: Sulfur forms and mercury uptake
TL;DR: In this paper, the authors used XPS and XANES to analyze sulfur forms on carbonaceous surfaces after exposure to hydrogen sulfide and found that higher temperatures promote the formation of organic sulfur and the presence of H2S during the cooling process increased elemental sulfur content.