Citation: Andrew O. Odeh. Qualitative and quantitative ATR-FTIR analysis and its application to coal char of different ranks[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(2): 129-137. shu

Qualitative and quantitative ATR-FTIR analysis and its application to coal char of different ranks

Andrew O. Odeh ^,

1.
Coal Research Group, Unit of Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Potchefstroom 2520, South Africa

Corresponding author: Andrew O. Odeh,
Received Date: 12 August 2014
Available Online: 30 November 2014

This paper analyzes the coal to char stages of char formation of six coals of different ranks by using Fourier transform infrared coupled with attenuated total reflectance (ATR-FTIR). The chars were obtained by coal pyrolysis carried out at temperature range of 450 ~700. The data obtained shows the pragmatic disappearance of the aliphatic hydrogen content with increasing char formation temperature. Numerical evaluation of the spectra enabled the determination of aromaticity, f_a. The aromaticity was found to be between 0. 66 ~0. 79 for lignite, 0. 75 ~0. 90 for sub-bituminous, 0. 84 ~1. 00 for low volatile bituminous, 0. 83 ~ 1. 00 for high volatile bituminous, 0. 94 ~1. 00 for semi-anthracite, and 0. 97 ~1. 00 for anthracite respectively. With increasing rank of coal samples, spectra exhibit rising aromaticity and enhanced condensation of aromatic rings, whereas the aliphatic chain lengths decrease.
- qualitative,
- quantitative,
- FT-IR,
- coal char
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