Identification of conjugated diolefins in fossil fuel liquids by 1H n.m.r. two-dimensional correlated spectroscopy

Maria I. Altbach, Carol P. Fitzpatrick

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Conjugated diolefins in fossil fuel liquids were identified by a two-dimensional (2D) 1H n.m.r. chemical shift correlated spectroscopy (COSY) experiment. The trans-terminal, trans-internal and (cis, trans)-internal conjugated diolefin isomers were clearly identified in the olefinic region of the 2D COSY spectrum by comparison with the 2D COSY spectra of model compounds. At 11.7 T, the cross peaks due to conjugated diolefins are well resolved from the cross peaks of non-conjugated olefins and styrene-like compounds. The resonance peaks corresponding to conjugated diolefins in the one-dimensional (1D) 1H n.m.r. spectrum were assigned based on the positions of cross peaks in the 2D COSY spectrum. Quantitation of conjugated diolefins from the 1D 1H n.m.r. spectra showed that conjugated diolefins were easily detected in the 2D COSY spectra when present at about 0.01 mmol of diene per gram of sample. For lower levels (0.001 mmol of diene per gram of sample) verification of the presence of diolefins was done by a 1D 1H n.m.r. homodecoupling experiment.

Original languageEnglish (US)
Pages (from-to)223-228
Number of pages6
JournalFuel
Volume73
Issue number2
DOIs
StatePublished - Feb 1994
Externally publishedYes

Keywords

  • H n.m.r.
  • diolefins
  • fossil fuel

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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