Abstract
The detailed mechanism of the high-temperature pyrolysis of toluene has been studied over a large range of pressures and temperatures by using mass spectrometric techniques. The vapors leaving a high-temperature Knudsen cell equipped with a gas inlet line were examined by using modulated molecular beam mass spectrometric techniques. The pyrolysis products from both quartz and tungsten Knudsen cells were examined over a pressure range of 10/sup -5/ to 1 torr and temperatures up to 1800/sup 0/C. At the lower pressures, only products with molecular weights lower than C/sub 7/H/sub 8/ were observed, including CH/sub 3/, C/sub 2/H/sub 2/, C/sub 3/H/sub 3/, C/sub 4/H/sub 2/, C/sub 4/H/sub 3/, C/sub 4/H/sub 4/, C/sub 5/H/sub 5/, C/sub 6/H/sub 6/, and C/sub 7/H/sub 7/. At higher pressure, these products undergo bimolecular processes to form heavier compounds, up to at least C/sub 20/H/sub 12/. To help define the reaction mechanism, the pyrolyses of C/sub 6/H/sub 5//sup 13/CH/sub 3/ and C/sub 6/H/sub 5/CD/sub 3/ were also studied, as well as toluene in the presence of H/sub 2/, C/sub 2/H/sub 2/, and C/sub 6/H/sub 6/. These studies allowed an unambiguous determination of most of the major processes occurring during toluene pyrolysis. 7 figures, 6 tables.
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