Title

X-ray Analysis of Liquid-Treated Coals. 1. Effects of Pyridine on the Short-Range Structuring in Beulah Zap Lignite

Document Type

Article

Publication Date

7-1-1998

Department

Chemistry and Biochemistry

Abstract

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.

Publication Title

Energy and Fuels

Volume

12

Issue

4

First Page

697

Last Page

703