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Acid treated halloysite nanotubes were utilized as a support for the NiO and CoO catalysts for the hydrocracking of the heavy oil residua obtained from vacuum distillation of the Azerbaijan crude oils. Halloysite was treated with hydrochloric acid prior to seeding the catalysts. Catalysts were further activated in plasma furnace at 850°C under argon atmosphere. Oil residue was hydrocracked with the...