Characterization of coal chars by Raman spectroscopy, X-ray diffraction and reflectance measurements

✍ Scribed by Catherine A. Johnson; John W. Patrick; K. Mark Thomas

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 809 KB
• Volume: 65
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(86)90243-7

✦ Synopsis

Raman spectroscopy is potentially a very useful technique for characterizing heterogeneous carbons and cokes. This paper describes an investigation of the relationships between Raman spectral parameters, optical reflectance measurements, and crystallite diameter, &,, determined by X-ray diffraction measurements. It is shown that the Raman D (1360cm-') bandwidth correlates with L, for cokes with heat treatment temperatures in the range 50&1900"C, the bandwidth decreasing as the crystallite diameter increases. The X-ray diffraction and Raman measurements do not correlate with the reflectance measurements. These results are discussed in terms of the coke structure and they suggest that Raman spectroscopy and reflectance measurements are potentially useful for characterising differences in thermal history in heterogeneous char samples.