<sup>13</sup>C-NMR study on effect of demineralization by mixed acid treatment on Yongxing lignite structure

WEI Qiang; TANG Yue-gang; WANG Shao-qing; HUANG Fan

Volume 43 Issue 04

Apr. 2015

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WEI Qiang, TANG Yue-gang, WANG Shao-qing, HUANG Fan. 13C-NMR study on effect of demineralization by mixed acid treatment on Yongxing lignite structure[J]. Journal of Fuel Chemistry and Technology, 2015, 43(04): 410-415.

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WEI Qiang, TANG Yue-gang, WANG Shao-qing, HUANG Fan. ¹³C-NMR study on effect of demineralization by mixed acid treatment on Yongxing lignite structure[J]. Journal of Fuel Chemistry and Technology, 2015, 43(04): 410-415.

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¹³C-NMR study on effect of demineralization by mixed acid treatment on Yongxing lignite structure

College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Received Date: 2014-09-09
Publish Date: 2015-04-30

Abstract

Abstract

Based on the theory of coal structure chemistry, the carbon composition differences between Yongxing lignite and its demineralized sample were comparatively studied with solid state ¹³C-CP/MAS NMR analysis. The results show that the impact of mixed acid treatment demineralization on the allocation proportion of aromatic carbons and aliphatic carbons is insignificant, but its destructive effects on quaternary carbon, aliphatic carbon bonded to oxygen in cyclic hydrocarbon, aromatic bridgehead carbon and carboxyl carbon are more apparent. While aromatic bridgehead carbon is depleted, the proportion of aromatic methyl does not decrease but slightly increases simultaneously. This indicates that the double/multi-ring structures are destroyed into single-ring ones and the aromatic cluster size shrinks, which is the most critical influence of demineralization by mixed acid treatment on Yongxing lignite structure.
- lignite structure,
- mixed acid treatment demineralization,
- ¹³C-NMR

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References(45)

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