Raman Spectroscopic Study of Coal Samples during Heating

Raman spectroscopy can be used to record the characteristic spectra of carbonaceous materials. The D and G bands are the most popular and most important spectral characteristics when discussing carbonaceous materials. In this paper, a Raman spectroscopic study of different coals was first carried ou...

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Bibliographic Details
Published inApplied sciences Vol. 9; no. 21; p. 4699
Main Authors Xie, Yingfang, You, Jinglin, Lu, Liming, Wang, Min, Wang, Jian
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2019
Subjects
Blue shift
Carbon
Carbonaceous materials
characteristic raman bands
Coal
Excitation spectra
Graphite
Graphitization
High temperature
in-situ raman spectroscopy
Laser beams
Lasers
Pyrolysis
Raman spectra
Raman spectroscopy
Spectroscopic analysis
Spectroscopy
Temperature dependence
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Summary:Raman spectroscopy can be used to record the characteristic spectra of carbonaceous materials. The D and G bands are the most popular and most important spectral characteristics when discussing carbonaceous materials. In this paper, a Raman spectroscopic study of different coals was first carried out using a 355 nm wavelength laser beam as an excitation source. The spectral parameters of the resultant spectra were evaluated and analyzed. Raman spectral characteristics of different kinds of coals were explored. The high temperature-dependent Raman spectra of the coals were further collected in a temperature range from 298 to 1473 K in order to investigate the transformations of the internal structure of the coals during the pyrolysis process. An abnormal blue shift of the G band occurred at moderate temperature (600–900 K), and the intensity of the G band became weaker at high temperatures, indicating pyrolysis and graphitization of the sample at moderate and high temperature, respectively.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9214699