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- W2034249673 abstract "The pyrolysis of six coals of differing rank and geographic origin has been studied by in situ ESR as a function of reactor geometry. The geometries used were a conventional sealed tube, an active vacuum cell that was continuously pumped during pyrolysis, and a flow cell using two different sweep velocities of gas through the sample bed during pyrolysis. It was found that for each coal studied the temperature dependence of the ESR signal after pyrolysis in a sealed tube apparently did not conform to the simple Curie law temperature dependence usually assumed in calculating the spin population at elevated temperature. In contrast, four of the coals, excepting the lignite and anthracite, showed temperature dependence behavior much closer to the assumed Curie law after pyrolysis in the vacuum or flow cell at low sweep velocities. However, at high sweep velocities in the flow cell abnormal temperature dependence effects were again observed for all of the coals, excluding the coking coal, which swells and blocks the flow tube. These results are discussed with relation to previous work and some general conclusions are drawn regarding coal structure and the role of free radicals during coal pyrolysis." @default.
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- W2034249673 date "1989-01-01" @default.
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- W2034249673 title "Pyrolysis of coals as a function of rank as studied by in situ electron spin resonance spectroscopy" @default.
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- W2034249673 doi "https://doi.org/10.1016/0008-6223(89)90124-3" @default.
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