and;
Power;
Department,;
National;
Technical;
University;
of;
Ukraine;
"KPI",;
Kyiv;
03056,;
Ukraine;
of;
Physical;
Chemistry;
of;
Combustible;
Minerals,;
L.;
M.;
Lytvynenko;
Institute;
of;
Physical-Organic;
Chemistry;
and;
CoalChemistry;
NAS;
of;
Ukraine,;
Lviv;
79053,;
Ukraine;