Abstract
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.
Highlights
Raman spectroscopy has been used to study carbonaceous materials since the 1970s [1]
Raman spectroscopy can be used to analyze the structure of coal and the quality of organic matter in order to characterize the catalysts in the coal chemical process and to detect heavy fraction leaching [3]
This paper describes an in-situ high temperature Raman spectroscopy study on selected coals and the evolution of the internal structural of coal during heating
Summary
Raman spectroscopy has been used to study carbonaceous materials since the 1970s [1]. Angoni [9] has postulated a simple qualitative analysis in order to distinguish carbonaceous materials with low, medium, and high structural organization by analyzing 15 samples that included graphite, coke, coal and anthracite. He has found that the width of the D band relates to the degree of its disorder, but that neither the D nor the G bands can explain the degree of this disorder. This paper describes an in-situ high temperature Raman spectroscopy study on selected coals and the evolution of the internal structural of coal during heating
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