The Determination of Hydroxyl Groups in Coal by Fourier Transform Infrared and 13C NMR Spectroscopy

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Abstract:

Fourier transform infrared spectroscopy and solid state 13C NMR spectroscopy have been used to measure the hydroxyl groups in coal. The methodology depends upon measuring the intensities of bands and resonances assigned to the products of acetylation reactions. In the infrared three separate bands, assigned to acetylated phenolic OH, alkyl OH, and NH groups, can be identified. In NMR, we used the methoxy carbon to determine the total OH. Spectroscopic measurements demonstrate that not only does the total OH content of coals but also the individual types of OH groups vary systematically as a function of rank. The proportion of phenolic to alkyl OH is approximately constant for the coals used in this study.

Keywords: Analysis, for hydroxyl groups in coal; Infrared; NMR

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702834634785

Affiliations: 1: Polymer Science Section, Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802; present address: IBM General Technology Division, P.O. Box 6, Endicott, NY 13760 2: Polymer Science Section, Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 3: Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106

Publication date: November 1, 1983

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