X-ray Analysis of Liquid-Treated Coals. 1. Effects of Pyridine on the Short-Range Structuring in Beulah Zap Lignite
Chemistry and Biochemistry
The X-ray scattering curves are statistically indistinguishable, except for a small difference at very low angle, for a sample of "as received" Beulah Zap lignite and for the Beulah Zap which has been dried at 107 degrees C in a convection oven. The addition of pyridine to Beulah Zap causes a significant change in the X-ray scattering curves obtained in the 1.0-2.5 Angstrom(-1) region of reciprocal space, and this difference is also found in the resulting structure curves which have been calculated in molecular (real) space. A model that suggests pyridine is hydrogen bonded to the oxygens contained in attachments which are covalently bonded to the "planar" C-9 units of Beulah Zap has been suggested, and both the specific and the average atom-pair distances calculated from this model are consistent with the structure function calculated from the X-ray scattering curve of the BZ-PYR sample.
Energy and Fuels
Wertz, D. L.,
Quin, J. L.
(1998). X-ray Analysis of Liquid-Treated Coals. 1. Effects of Pyridine on the Short-Range Structuring in Beulah Zap Lignite. Energy and Fuels, 12(4), 697-703.
Available at: http://aquila.usm.edu/fac_pubs/5018