Chemical characterization of the surface sites of coal [electronic resource] : Technical progress report, September 15--December 14, 1988
- Bethlehem, Pa. : Lehigh University, 1989. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Pages: 29 : digital, PDF file
- Additional Creators:
- Lehigh University and United States. Department of Energy. Office of Scientific and Technical Information
- We propose to do experimental studies in four related areas concerning the acid-base properties of coal surfaces: (1) develop high precision flow microcalorimetric methods for determining the concentrations and strengths of the acidic and basic surface sites of coal powders; (2) develop photo-acoustic FTIR and solid-state NMR spectral shift techniques for determination of the concentrations and strengths of acidic and basic surface sites of coal powders; (3) determine the concentrations and strengths of the acidic and basic surface sites of some of the well-characterized coal samples from Argonne National Labs, comparing the coal samples before and after demineralization treatments with HCl and HF; (4) study the effects of surfaces acidity and basicity on the coal/water interface, with emphasis on the role of interfacial acid-base interactions in the absorption of ions, surfactants and coal/water slurry stabilizers. In our previous report we described a method for determining the heat of acid-base interaction in two-component systems (acid and base) from measured infrared and NMR spectral shifts. Spectral shift measurements in three-component systems are in principal more accurate since through the appropriate choice of neutral solvent, the heat of interaction can be directly obtained. We will present, as an example, the interaction of triethylphosphine oxide with five acids using CCl/sub 4/ as the solvent. In addition we show how NMR chemical shifts in three-component systems can be used to characterize the acidity of many of the solvents investigated by Gutmann in two-component, base:solvent systems. 16 refs., 11 figs., 3 tabs.
- Published through SciTech Connect., 04/01/1989., "doe/pc/79925-5", "DE89013224", and Fowkes, F. M.; Riddle, Jr., F. L.; Cole, D. A.
- Funding Information:
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