CPMAS and DDMAS {sup 13}CNMR analysis of coal liquefaction residues
- Penn State Univ., University Park, PA (United States); and others
We have shown in previous papers that spectroscopic analyses of liquefaction residues (by NMR, pyrolysis-GC-MS, and FT-IR) can provide important structural information which can be used for elucidating the chemical reactions of liquefaction as well as the effects of dispersed catalysts. The present work involves solid-state {sup 13}C NMR studies of residues of two subbituminous coals from their liquefaction at 300-425{degrees}C, using cross-polarization (CP), dipolar dephasing (DD) and magic-angle-spinning (MAS) techniques. A preliminary survey of some CPMAS {sup 13}C NMR results for one of the two coals was presented previously. In a companion paper, we report on the analysis of oils from liquefaction of these coals by two-dimensional HPLC and GC-MS.
- OSTI ID:
- 254791
- Report Number(s):
- CONF-940813--
- Country of Publication:
- United States
- Language:
- English
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