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FT-Raman spectroscopy with a 1064nm laser was used to investigate chemical structural changes of char during the pyrolysis of Victorian Loy Yang brown coal samples. The chars were diluted with KBr in order to record Raman spectra with acceptable quality. The interpretation of the Raman spectral data for these highly disordered and heterogeneous chars differs distinctly from that for the highly condensed/graphitised...
Temperature-programmed pyrolysis of a Victorian brown coal was performed under flow of atmospheric He or CO 2 in a wire-mesh reactor, in which extent of the secondary reactions of volatiles was minimised. Over the ranges of heating rate, holding temperature and holding time of 0.5-1000 o C s -1 , 500-900 o C, and 0-120 s, respectively, changing the atmosphere from...
A set of ion-exchanged samples prepared from Loy Yang lignite was pyrolyzed in a wire-mesh reactor at elevated pressures from 1 to 36bar. The tar yields from the pyrolysis of H-form (acid-washed) sample at a fast heating rate of 1000 o Cs -1 were drastically reduced by increasing pressure to 6bar and then remained unchanged with further increase in pressure to 36bar. This behavior...
A Loy Yang lignite sample was pyrolysed in a wire-mesh reactor at pressures from 1 to 61bar. The char yield did not show considerable sensitivity to changes in pressure or heating rate and was mainly a function of temperature. However, the tar yield was sensitive to changes in pressure, holding time and heating rate. The tar yield at 1000Ks -1 showed a minimum at around 6-11bar. The tar...
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