Electrochemical interaction of beypazari lignite in strong acidic media


Özyörük H., PEKMEZ K., Yürüm Y.

Fuel Science and Technology International, vol.5, no.6, pp.677-696, 1987 (Scopus) identifier

Abstract

Beypazari lignite was extracted with acetonitrile and acetonitrile/HClO. and electrochemical hydrogenation of the lignite in acetonitrile/LiCIO4 in the presence of HCIOA was investigated. Controlled potential electrolysis experiments were carried out at-0.5 V vs a Ag/AgCl electrode. Infrared spectra of the products were measured and yields of extraction were determined. Extraction yields in acetonitrile and acetoni tr i le/HCIO. were 9 and 17.3 %, respectively. The yield of extractable material did not increased in the electrochemical environment. Acetonitrile extraction produced residual matter with less hydroxyl groups. Stirring the lignite in acetonitrile/HClO. for 7 hours oxidized both the extract and the residue. The residue seemed to contain less hydroxyl groups than that of the acetonitrile extraction residue and it has new carbonyl and etheric groups that were absent in the original lignite. It was found that the material extracted during electrochemical treatment by acetonitrile/HCld4 was hydrogenated and the coal matrix remained intact. As the quantity of HCIO4 consumed in electrolysis was increased the amount of methyl groups in the extract also increased. Higher potentials are probably neccessary to hydrogenate the coal matrix by the electrochemically produced hydrogen atoms. © 1987, Taylor & Francis Group, LLC. All rights reserved.