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

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; WANG Jie

doi:10.1088/1674-1137/37/2/028003

Chinese Physics C> 2013, Vol. 37> Issue(2) : 028003 DOI: 10.1088/1674-1137/37/2/028003

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

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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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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

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Received: 2012-03-22
Revised: 2012-05-21

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: WANG Jie,

Received Date: 2012-03-22

Accepted Date: 2012-05-21

Available Online: 2013-02-05

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

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