Contents of O-containing functional groups in coals by <sup>13</sup>C NMR analysis

WANG Yong-gang; ZHOU Jian-lin; CHEN Yan-ju; HU Xiu-xiu; ZHANG Shu; LIN Xiong-chao

Volume 41 Issue 12

Dec. 2013

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WANG Yong-gang, ZHOU Jian-lin, CHEN Yan-ju, HU Xiu-xiu, ZHANG Shu, LIN Xiong-chao. Contents of O-containing functional groups in coals by 13C NMR analysis[J]. Journal of Fuel Chemistry and Technology, 2013, 41(12): 1422-1426.

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WANG Yong-gang, ZHOU Jian-lin, CHEN Yan-ju, HU Xiu-xiu, ZHANG Shu, LIN Xiong-chao. Contents of O-containing functional groups in coals by ¹³C NMR analysis[J]. Journal of Fuel Chemistry and Technology, 2013, 41(12): 1422-1426.

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Contents of O-containing functional groups in coals by ¹³C NMR analysis

School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China

Received Date: 2013-04-16
Rev Recd Date: 2013-08-23
Publish Date: 2013-12-30

Abstract

Abstract

The solid state high resolution ¹³C CP/MAS NMR technology was employed to analyze O-containing functional groups in 4 coals. The variation and contents of inactive O-containing functional groups in the coals were obtained in combination with chemical method. The results show that the ¹³C CP/MAS NMR method is effective to obtain the contents of some O-containing functional groups. The contents of carboxyl and carbonyl in the low rank coal are from 0.00 to 1.41 and from 0.45 to 1.91 mol/kg, respectively. Combined with chemical method, the content of ether bond is obtained, which is from 5.33 to 10.54 mol/kg. However, the value of inactive ether bond in the coals is only from 0.04 to 0.13 mol/kg, and the occurrence of the ether bond is predominantly inactive, few of them exists in high rank coal.
- coal,
- O-containing functional groups,
- ¹³C CP/MAS NMR,
- inactive ethers

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References(18)

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