Abstract
The results reported indicate that the low molecular weight olefins (ethylene, propylene and butadiene) which are major gaseous hydrocarbon products of flash pyrolysis of coal derive from the same precursors in coal, whereas methane, benzene and other pyrolysis products are mainly formed from different components in the coal. CP/MAS 13C n.m.r. spectra suggest that the olefin precursors are long-chain polymethylene structures (chemical shift 31 ppm), either chemically bound or mechanically trapped in the coal and thus not solvent-extractable.
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