TY JOUR TI ANALYSIS OF THE EFFECTIVENESS OF THE HEAVY OIL SLUDGE HYDROCRACKING PROCESS WHEN MODIFYING COAL ADDITIVES WITH METAL OXIDES KW HEAVY PETROLEUM RESIDUE KW HYDROCRACKING KW TAR-ASPHALTENE SUBSTANCES (SAV) KW COAL ADDITIVE KW PORE SPACE KW HYDROGENATION KW LIQUID HYDROCARBONS JO Herald of Technological University AU Antonova, M.Y. AU Zayceva, E.G. AU , .. AU Davletshin, A.R. AU , .. AU , .. AU Bashkitseva, N.Y. PY 2025 IS 28 PB Kazan National Research Technological University