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This work is concerned with the Ca transformations during the pyrolysis ofCa(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 preparedfrom the pyrolysis of Ca-added coal. Results showed that Ca(OH)2 and CaSO4existed in both the Ca(OH)2-added chars and the CaCO3-added chars, while CaSand 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 eitherthe Ca(OH)2-added coal or the CaCO3-added coals.

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