Two dimensional NMR and NMR relaxation studies of coal structure. Progress report, 1 January 1994--31 March 1994
This report covers the progress made on the title project for the project period. Four major areas of inquiry are being pursued. Advanced solid state NMR methods are being developed to assay the distribution of the various important function groups that determine the reactivity of coals. Special attention is being paid to methods that are compatible with the very high magic angle sample spinning rates needed for operation at the high magnetic field strengths available today. Polarization inversion methods utilizing the difference in heat capacities of small groups of spins are particularly promising. Methods combining proton-proton spin diffusion with {sup 13}C CPMAS readout are being developed to determine the connectivity of functional groups in coals in a high sensitivity relay type of experiment. Additional work is aimed at delineating the role of methyl group rotation in the proton NMR relaxation behavior of coals.
- Research Organization:
- Yale Univ., New Haven, CT (United States). Dept. of Chemistry
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-91PC91285
- OSTI ID:
- 10185052
- Report Number(s):
- DOE/PC/91285--10; ON: DE95000420; BR: AA1525050
- Country of Publication:
- United States
- Language:
- English
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