Skoblik O. Effect of iron compounds on interatomic interaction and methane formation in the coal

Using Moessbauer spectroscopy, electron paramagnetic and ferromagnetic resonances, electron-nuclear double resonance and ion mass spectrometry for the integrated study of the coal, it was firstly established that the iron content and features of the interatomic bonds in the iron compounds on methane formation in the coal. In particular, there is a significant effect of iron valence on the methane generation. It was shown that the two-valence iron compounds contribute more efficiently to its formation. With the help of the simulation experiment, it was found that during heating the methane generation occurs from the mixture of pure graphite and iron compounds. This proves the abiogenic origin of the methane formation. It was found that, during the reaction of the methane formation, pyrite with trivalent iron transforms into marcasite with trivalent iron, whereas siderite with bivalent iron transforms into a mixture of marcasite and sulphate with two-valent iron. A suggestion is made that marcasite is the final product of reactions of methane formation.