MODIFICATION OF IRON-ORE CATALYSTS FOR LIGNITE HYDROGENATION AND HYDROCRACKING OF COAL-DERIVED LIQUIDS

The activity of haematite, magnetite, pyrite and pyrrhotite containing ore catalysts, modified by treatment in a tensile-energy planetary ac tivator mill and by elemental sulphur additions, has been studied in l ignite hydrogenation and coal-derived liquid hydrocracking processes. The application of modified ore catalysts resulted in a significant (b y two to four times) increasing of lignite conversion degree and in hi gher yields of distillate fractions, obtained by hydrocracking of heav y coal-liquids. Mechanical activation of iron ore catalysts in the pre sence of elemental sulphur increased their surface area and promoted t he formation during hydrogenation process at dispersed pyrrhotite part icles with high catalytic activity.