Abstract
In the hydroprocessing of solvent-refined coals, both the pore structure and the chemical properties of the catalysts affect the conversion of the heavy materials. Increasing median pore diameter (MPD) of unimodal Ni-Mo/Al 2 O 3 catalysts in the relatively small pore region (up to 150 A) enhanced the conversion of both asphaltene and preasphaltene, but further increasing the MPD up to 730 A mainly promoted preasphaltene conversion. In the runs of the isolated fractions, however, conversions increased with MPD up to 290 A for asphaltene and up to 730 A for preasphaltene
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