Abstract
Coal pyrolysis tars produced from a United States bituminous coal in two reaction confinements of different aspect ratios (0.11:1.0 and 2.0:1.0) and at heating rates of 1, 3, and 10 °C min–1 were analyzed by laser desorption/ionization–time-of-flight mass spectrometry (LDI–TOF), thermogravimetric–gas chromatography (TG–GC), and gas chromatography–mass spectrometry (GC–MS). The reaction confinement served to extend the volatile residence time in the pyrolysis environment by 350 ms. The goal of this study was to determine the effect of extended residence times on the tar product distribution. LDI–TOF and GC–MS analyses combined suggest that tars exposed to an extended residence time in the pyrolysis environment were lower in average molecular weight, had a lower H/C ratio, and produced more expansive speciation of nitrogen and sulfur species. The heating rates were able to vary the average tar molecular weight by 15–32 amu, which is, at least in part, attributed to variations in the volatile residence time ...
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