A tandem mass spectrometric investigation of hydroxy-aromatic constituents in coal liquids |
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| Authors: | KV Wood LF Albright JS Brodbelt RG Cooks |
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| Institution: | Engine Fuels Laboratory, Chemistry Building, Purdue University, W. Lafayette, IN 47907 U.S.A.;Department of Chemical Engineering, Purdue University, W. Lafayette, IN 47907 U.S.A.;Department of Chemistry, Purdue University, W. Lafayette, IN 47907 U.S.A. |
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| Abstract: | Preasphaltene fractions of exinite and vitrinite macerals, liquefied in tetralin, were examined by chemical ionization mass spectrometry/mass spectrometry for phenolic constituents. Recognition was based on dehydration of the protonated molecule with confirmation from daughter spectra, which in some cases could be compared with the spectra of authentic compounds. Rapid screening for homologous compounds was achieved by employing parent scans. Twelve homologous series of hydroxyaromatic compounds were identified, including phenols, naphthols, indenols, indanols, and some dihydroxy compounds. Many of the alkylated species have not been previously reported in coal liquids. While tanden mass spectrometry is an effective means of encountering new compounds, it does not provide the isomer selectivity of chromatographic methods to which it is complementary. |
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