Molecular size determination of coal-derived asphaltene by fluorescence correlation spectroscopy

A. Ballard Andrews, Wei Chuan Shih, Oliver C. Mullins, Koyo Norinaga

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The molecular properties of asphaltenes have been the subject of uncertainty in the literature; in particular the molecular architecture is still a matter of debate. Some literature reports provide evidence that the contrast of petroleum asphaltenes versus coal-derived asphaltenes is useful for understanding the governing principles of asphaltene identity. Here, we employ fluorescence correlation spectroscopy to measure the diffusion constants of asphaltenes obtained from the distillation resid from coal liquefaction fluids. Concentrations employed herein are ̃10-8 molar, precluding asphaltene aggregation. These are compared with the same measurements on petroleum asphaltenes. These results confirm that the molecular sizes of these coal-derived asphaltenes are much smaller than virgin petroleum asphaltenes. Coal-derived asphaltenes are simpler than petroleum asphaltenes and provide correspondingly tighter constraints for understanding asphaltene molecular architecture. The small size, small alkane fraction, and large PAH of coal-derived asphaltenes are consistent with an "island" molecular architecture.

Original languageEnglish
Pages (from-to)1348-1356
Number of pages9
JournalApplied Spectroscopy
Volume65
Issue number12
DOIs
Publication statusPublished - Dec 21 2011

Fingerprint

Size determination
size determination
asphaltenes
Asphaltenes
Coal
coal
Fluorescence
Spectroscopy
fluorescence
spectroscopy
Petroleum
crude oil
Crude oil
coal liquefaction
asphaltene
Coal liquefaction
Alkanes
distillation
molecular properties
polycyclic aromatic hydrocarbons

All Science Journal Classification (ASJC) codes

  • Spectroscopy
  • Instrumentation

Cite this

Molecular size determination of coal-derived asphaltene by fluorescence correlation spectroscopy. / Andrews, A. Ballard; Shih, Wei Chuan; Mullins, Oliver C.; Norinaga, Koyo.

In: Applied Spectroscopy, Vol. 65, No. 12, 21.12.2011, p. 1348-1356.

Research output: Contribution to journalArticle

Andrews, A. Ballard ; Shih, Wei Chuan ; Mullins, Oliver C. ; Norinaga, Koyo. / Molecular size determination of coal-derived asphaltene by fluorescence correlation spectroscopy. In: Applied Spectroscopy. 2011 ; Vol. 65, No. 12. pp. 1348-1356.
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