Determination of the calcium species in coal chars by Ca K-edge XANES analysis

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LIU Li-Juan, LIU Hui-Jun, CUI Ming-Qi, HU Yong-Feng, ZHENG Lei, ZHAO Yi-Dong, MA Chen-Yan, XI Shi-Bo, YANG Dong-Liang, GUO Zhi-Ying and WANG Jie. Determination of the calcium species in coal chars by Ca K-edge XANES analysis[J]. Chinese Physics C, 2013, 37(2): 028003. doi: 10.1088/1674-1137/37/2/028003
LIU Li-Juan, LIU Hui-Jun, CUI Ming-Qi, HU Yong-Feng, ZHENG Lei, ZHAO Yi-Dong, MA Chen-Yan, XI Shi-Bo, YANG Dong-Liang, GUO Zhi-Ying and WANG Jie. Determination of the calcium species in coal chars by Ca K-edge XANES analysis[J]. Chinese Physics C, 2013, 37(2): 028003.  doi: 10.1088/1674-1137/37/2/028003 shu
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Received: 2012-03-22
Revised: 2012-05-21
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Determination of the calcium species in coal chars by Ca K-edge XANES analysis

    Corresponding author: WANG Jie,

Abstract: Ca-based additives have been widely used as a sulfur adsorbent during coal pyrolysis and gasification. The Ca speciation and evolution during the pyrolysis of coal with Ca additives have attracted great attention. In this paper, Ca species in the coal chars prepared from the pyrolysis of Ca(OH)2 or CaCO3-added coals are studied by using Ca K-edge X-ray absorption near-edge structural spectroscopy. The results demonstrate that Ca(OH)2, CaSO4, CaS and CaO coexist in the Ca(OH)2-added chars, while Ca(OH)2 and CaSO4 are the main species in the Ca(OH)2-added chars. Besides, a carboxyl-bound Ca is also formed during both the pyrolysis for the Ca(OH)2-added and the CaCO3-added coals. A detailed discussion about the Ca speciation is given.

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