Contents of O-containing functional groups in coals by 13C NMR analysis
Access Status
Authors
Date
2013Type
Metadata
Show full item recordCitation
Source Title
ISSN
School
Collection
Abstract
The solid state high resolution 13 C 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 13 C 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.
Related items
Showing items related by title, author, creator and subject.
-
Wang, Y.; Zhou, J.; Bai, L.; Chen, Y.; Zhang, Shu; Lin, X. (2014)Shengli (SL) lignite was thermally treated by heating at 200-350 C in an effort to reduce the number of O-containing functional groups and water present. The presence of carboxyl groups, phenolic hydroxyl groups, and ...
-
Wang, Y.; Zhou, J.; Xu, M.; Xu, D.; Zhang, Shu (2012)The purpose of this paper is to investigate the change of the O-containing functional groups in Shengli (SL) brown coal upon to the pyrolysis at low temperatures and pressures. The amounts of different O-containing ...
-
Zhang, L.; Kajitani, S.; Umemoto, S.; Wang, S.; Quyn, D.; Song, Y.; Li, T.; Zhang, S.; Dong, L.; Li, Chun-Zhu (2015)The purpose of this study is to investigate the structural changes in nascent chars during the gasification of two low-rank coals in CO2 at 1000 °C and 1200 °C. Western Australian Collie sub-bituminous coal and Victorian ...