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Pyrolysis‐gas Chromatography/mass Spectrometry of Pitch Fractions Recovered from Preparative Size Exclusion Chromatography: Structural Differences with Increasing Molecular Size by C. A. Islas; I. Suelves; J. F. Carter; A. A. Herod; R. Kandiyoti is a Chemistry article available to read on EtoBox.

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## Abstract A sample of high‐temperature coal tar pitch has been fractionated by preparative scale size exclusion chromatography (SEC). Twenty‐four fractions corresponding to narrow molecular mass distributions were collected at sequential elution times of 3 minutes. The preparative scale column is thought to have filtered out most of the very large molecular mass material and the analysis focused on smaller mass components. The recovered fractions were characterised by analytical SEC. Pyrolysis‐gas chromatography/mass spectrometry (pyrolysis‐GC/MS) of the fractions was used to evaluate changes in main structural features with changing molecular size. As expected, analytical SEC of the fractions showed a systematic shift to smaller molecular sizes with increasing elution time. UV‐fluorescence spectra of the samples showed parallel structural shifts to shorter wavelengths and gains in intensity with increasing elution times. Pyrolysis‐GC/MS showed parent polycyclic aromatic components considered typical of pitch. The major fragments detected were pyrenes and fluoranthenes (__m/z__ 202) and chrysenes (__m/z__ 228). Benzopyrenes (__m/z__ 252) and larger aromatics were not prominent am

Who reads Pyrolysis‐gas Chromatography/mass Spectrometry of Pitch Fractions Recovered from Preparative Size Exclusion Chromatography: Structural Differences with Increasing Molecular Size?

Author

C. A. Islas; I. Suelves; J. F. Carter; A. A. Herod; R. Kandiyoti

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0951-4198)

Published

2002

Language

EN

Field

Chemistry (Physical Sciences)