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Determination of the forms of calcium present in coal chars by Ca K-edge XANES with Synchrotron Radiation

This work is concerned with the Ca transformations during the pyrolysis of Ca(OH)2 or CaCO3-added coals. Ca K-edge X-ray absorption near edge structure (XANES) spectroscopy was applied to determine the forms of Ca in chars prepared from the pyrolysis of Ca-added coal. Results showed that Ca(OH)2 and CaSO4 existed in both the Ca(OH)2-added chars and the CaCO3-added chars, while CaS and CaO only existed in the chars prepared from the Ca(OH)2-added coal. Moreover, it was found that carboxyl Ca was formed during pyrolysis for either the Ca(OH)2-added coal or the CaCO3-added coals.

preprint2012arXivOpen access
Lijuan LiuHuijun LiuMingqi CuiYongfeng HuLei ZhengYidong ZhaoChenyan MaShibo XiDongliang YangZhiying GuoJie Wang
physics.chem-ph
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Open access11 authors1 topic
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Lijuan LiuHuijun LiuMingqi CuiYongfeng HuLei ZhengYidong ZhaoChenyan MaShibo XiDongliang YangZhiying GuoJie Wang

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