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- W253950843 abstract "Pulsed /sup 1/H free induction decay NMR experiments have been performed on 23 coals. Three populations of protons were found, having quite different degrees of rotational mobility. Protons of medium mobility might be assigned to particularly flexible parts of the macromolecular network, but this hypothesis is difficult to reconcile with the facts that the decay time constant and the content of the relevant protons vary little with rank in the range lignite to the upper part of the HVA class. The hexane-soluble parts of a set of ten solvent extracts and liquefaction products from an Illinois No. 6 sample have been analyzed by tandem mass spectrometry. A number of homologous series of alkyl derivatives of polycyclic aromatic hydrocarbons was found. An examination of catalyst-impregnated coals has shown that much Mo was more uniformly dispersed by freeze drying the aqueous coal/metal-salt slurry than by drying in vacuum at 110/sup 0/C. Subsequent esperiments in dry catalytic coal hydrogenation at PSU have demonstrated that low-temperature drying results in higher conversion to chloroform-soluble liquids and gases and improved product selectivity; namely, an increase in the oil to asphaltene ratio. The dry catalytic hydrogenation of a Belgian bituminous coal has been studied as a function more » of reaction time at 350 and 400/sup 0/C. At 400/sup 0/C, as with the other bituminous coal and the subbituminous coal already investigated, the oil to asphaltene ratio was found to pass through a minimum between 5 and 30 min. Future work will focus upon the compositional changes occurring up to, and beyond, the minimum. The mechanism of dry catalytic hydogenation, especially in the initial stages of reaction, is not at all clear. « less" @default.
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- W253950843 date "1985-09-01" @default.
- W253950843 modified "2023-09-23" @default.
- W253950843 title "Mobile phase in coals: its nature and modes of release. Technical progress report, March to May 1985 and June to August 1985" @default.
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