Abstract
In preceding paper it became clear that the secondary methane evolution occurs under certain experimental conditions on pyrolysis of coal.
In order to study more deeply the secondary methane evolution, the evolution rate of methane and hydrogen were measured simultaneously for Omine anthracite and Taiheiyo coal. The secondary methane evolution was accompanied with corresponding decrease in hydrogen evolution. It is suggested that the secondary methane evolution occurs according to equation C+2H2=CH4 on an average and is proportional to evolved hydrogen partial pressure.
Additional experiments were carried out using flow type high pressure thermo-balance in order to examine the influence of pressure on the weight loss of sample. It was found that the weight loss of sample were not affected by pressure applied. This leads to the conclusion that the inert gas pressure has not substantial effect on the evolution rate of primary tar.
