NMR Results Raise Questions on Coal Liquefaction Model Compound Studies
To provide a further understanding of the mechanism of coal liquefaction, a wide range of reactions has been studied with model compounds having chemical bonds similar to those believed present in coal. These results have been compared with those obtained by NMR and MS analysis of products from coal liquefaction runs with deuterium labeled solvents. As indicated from the model compound reactions, coal liquefaction products should have much of the deuterium in sites α to aromatic rings and in short chain cracking products. However, the distribution of deuterium in the coal-derived oil and asphaltene fractions is only 40 to 50% in α positions, while 5–15% are at combined β and γ positions, 30–45% in aromatic sites, and 5–10% in C-H sites adjacent to heteroatoms. The distribution is moderately affected by liquefaction temperature but less so reaction time.
KeywordsHydrogen Transfer Coal Liquefaction Asphaltene Fraction Como Catalyst Deuterium Distribution
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- 3.Francis, W., (1954) “Coal, Its Formation and Composition,” Edward Arnold (Publishers) Ltd., 1.Google Scholar
- 4.Given, P. H., (1960) Fuel 39, 147 (also 1961, Fuel 40, 427 ).Google Scholar
- 6.Ross, D. S., etal., Various Quarterly and Annual Reports reported under DOE Contract No. EF-76-C-01-2202.Google Scholar