Abstract
Hydrogen exchange has been studied during lignite pyrolysis by heating mixtures of an oven-dried (105 °C) Loy Yang lignite and deuterium-labeled water (D2O) in a quartz U-tube reactor. A typical experiment consisted of heating the lignite from ambient temperature to 500 ± 2 °C at 20 °C/min under a flow of nitrogen. A higher-heating rate experiment (6 °C/s) was also performed. The collected tar fractions were analyzed by gas chromatography and mass spectrometry, which allowed detailed analysis of individual components. Inspection of the mass spectra of some of the components showed changes that reflected deuterium had been incorporated into their molecular structure during pyrolysis. The relative extent of deuterium incorporation was quantitated by mass fragmentography of selected ions, with the molecular ion in most cases being used. Four compounds were chosen for detailed analysis: 1-methylnaphthalene, 2-methylphenol, 1-octadecene, and n-octadecane. The pyrolysis experiments showed that a significant amo...
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