Modern Multiple-Pulse, High Field NMR Studies of High Density Jet Fuels
Abstract
Modern high field NMR spectroscopic techniques have been evaluated in order to assess the capabilities of such techniques for the study of jet fuels and related materials. The utility and quantitative aspects of spectral editing techniques were evaluated. The DEPT method is one of the more attractive spectral editing pulse sequences but the quantitative aspects of all such editing procedures are quite poor. The field of 2-dimensional NMR spectroscopy is growing rapidly and several existing 2-D techniques are quite attractive for jet fuel studies. The protonhomonuclear correlation experiment is shown to provide useful information even in complex fuels. The heteronuclear correlation (1H-13C) experiment permits one to sort out overlapping lines in both the proton and carbon frequency domains. The J-coupled 2-D experiment is very useful for characterizing the nature of the carbon resonances as C, CH, CH2 and CH3 groups in jet fuels. A combination of heteronuclear correlation and J-coupled 2-D experiments allow one to sort and identify the hundreds of resonance lines in jet fuels. The 2-D inadequate method was shown to be a particularly useful experiment for determining carbon-carbon connectivities. A combination of the heteronuclear correlation, J-coupled, and INADEQUATE 2-D experiments proved to be a very powerful combination of techniques for identifying all of the major structural types of fragments in the JP-4, JP5, and MIG-25 fuels. It is shown that pattern recognition techniques can be used to correlate the data from several experiments and identify fuel constituents at a level of detail that exceeds other presently available analytical methods. Fuel analysis, Structural identification.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1988
- Accession Number
- ADA203320
Entities
People
- Charles L. Mayne
- David M. Grant
- Donald W. Alderman
- Janet C. Curtis
- Ronald J. Pugmire
Organizations
- University of Utah