Groups of Paramagnetic Centres in Reduced and Methylated Low Rank Coal

Abstract

Low rank Illinois No. 6 coal was studied by electron paramagnetic resonance EPR spectroscopy. The parameters of EPR spectra (spectroscopic splitting factors g, linewidths ∆Bpp, concentrations of paramagnetic centres N ) were measured for row and chemically treated coal (demineralized, reduced and methylated samples). The multicomponent structure of experimental spectra of this coal was proved. Two groups of paramagnetic centres responsible for broad Lorentzian 1 and narrow Lorentzian 2 lines exist in studied samples. Paramagnetic centres connected with component lines revealed dierent behaviour during chemical treatments.