Paramagnetic Centres in Coal Macerals

• Authors: G. Słowik , A. Więckowski
• Languages of publication: EN

Abstracts

EN

The electron paramagnetic resonance (EPR) study of coal macerals: exinite, vitrinite and inertinite separated from clarain of the Polish medium-rank coal with carbon content of 85.6 wt% C, were performed. Using the continuous microwave saturation technique (measurements at 223 K and 291 K), as a result of numerical analysis of recorded EPR spectra of exinite, vitrinite and inertinite, their multi-component structure was shown. The EPR spectra of exinite and vitrinite consist of three component lines: one Gaussian G and two Lorentzians: L1 and L3. The EPR spectra of inertinite consist of two narrow lines with Lorentzian line shape L2 and L3. Temperature measurements of studied coal macerals in the range 100-373 K were done. It was evidenced that, in group of paramagnetic centres responsible for Lorentzian L1 component line, paramagnetic centres with thermally excited triplet states (S = 1) exist. Existence of paramagnetic centres with thermally excited triplet states was not observed in inertinite.

Keywords

EN

61.66.Hq; 76.30.Rn; 89.30.ag

Discipline

• 76.30.Rn: Free radicals
• 61.66.Hq: Organic compounds
• 89.30.ag: Coal

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 3
• Pages: 507-510

Dates

published

2010-09

Contributors

author

G. Słowik

• Institute of Physics, Faculty of Physics and Astronomy, University of Zielona Góra, Szafrana 4a, 65-516 Zielona Góra, Poland

author

A. Więckowski

• Institute of Physics, Faculty of Physics and Astronomy, University of Zielona Góra, Szafrana 4a, 65-516 Zielona Góra, Poland

References

• 1. B. Bleaney, K.D. Bowers, Proc. R. Soc. Lond., Series A 214, 451 (1952)
• 2. T.F. Yen, J.G. Erdman, A.J. Saraceno, Anal. Chem. 34, 694 (1962)
• 3. T.F. Yen, D.K. Young, Carbon 11, 33 (1973)
• 4. S. Duber, A.B. Więckowski, Fuel 63, 1474 (1984)
• 5. A.B. Więckowski, B. Pilawa, L. Świątkowska, W. Wojtowicz, G.P. Słowik, M. Lewandowski, J. Magn. Reson. 145, 62 (2000)
• 6. T.I. Smirnova, A.I. Smirnov, R.B. Clarkson, R.L. Belford, Solid State Commun. 91, 319 (1994)
• 7. T.I. Smirnova, A.I. Smirnov, R.B. Clarkson, R.L. Belford, J. Phys. Chem. 98, 2464 (1994)
• 8. T. Ikoma, O. Ito, S. Tero-Kubota, Energy Fuels 16, 40 (2002)
• 9. D. Gourier, L. Binet, A. Skrzypczak, S. Derenne, F. Robert, Spectrochim. Acta A Mol. Biomol. Spectrosc. 60, 1349 (2004)
• 10. O. Delpoux, D. Gourier, L. Binet, H. Vezin, S. Derenne, F. Robert, Spectrochim. Acta A Mol. Biomol. Spectrosc. 69, 1301 (2008)
• 11. G.P. Słowik, A.B. Więckowski, Mol. Phys. Rep. 34, 146 (2001)
• 12. G.P. Słowik, A.B. Więckowski, Appl. Magn. Reson. 24, 437 (2003)
• 13. O. Ito, H. Seki, M. Iino, Bull. Chem. Soc. Jpn. 60, 2967 (1987)
• 14. G.P. Słowik, W. Wojtowicz, A.B. Więckowski, Acta Phys. Pol. A 108, 171 (2005)
• 15. K.S. Rothenberger, R.F. Sprecher, S.M. Castellano, H.L. Retcofsky, in: Magnetic Resonance of Carbonaceous Solids, Eds. R.E. Botto, S. Sanada, Symp. of 1989 Int. Chemical Congress of Pacific Basin Societes, Honolulu (Hawaii) 1989, Advances in Chemistry Series, Vol. 229, American Chemical Society, Washington DC 1993, Ch. 26, p. 581

Identifiers

DOI

10.12693/APhysPolA.118.507