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Changes in sample reactivity and catalyst deactivation during the early stages of the hydrocracking of coal liquefaction extracts, using presulphided supported NiMo/Al 2 O 3 and a dispersed Mo catalyst, have been investigated. The characterisation of the liquefaction extract and the hydrocracking products has been made using size exclusion chromatography (SEC), UV-fluorescence spectroscopy...
The paper describes how a coal tar pitch, extensively studied by other techniques, has been fractionated by planar chromatography using successive development in THF, chloroform-methanol, toluene and pentane. Pitch fractions were distinguished by relative retention.
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