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- W1531024927 abstract "Abstract A critical factor that limits the maximum attainable conversion of heavy residues to lighter cuts in commercial residue hydroprocessing units is coke-like sediments formation. Suppression of sediments formation is highly desirable to increase distillate yields. As part of a research program on the factors which influence sludge or sediments formation during hydroprocessing of Kuwait vacuum residue for high conversion, we have investigated the relation between catalyst pore size, asphaltene conversion and coke-like sediments formation. Five Ni-Mo/γ-Al 2 O 3 catalysts with different unimodal and bimodal pore size distribution were used in the study. A unimodal pore catalyst with maximum pore volume in medium size mesopore range (100–200dia) showed the highest activity for the overall conversion of the residual oil to distillates. However, a relatively larger percentage of sediments was also observed for this catalyst. Catalysts with a large proportion of macropores, particularly in the 800–3000range produced little or no sediments, but showed poor activity for asphaltene cracking and overall conversion of residual oil to distillates. Molecular weight of the residual asphaltenes in the product increased with decreasing catalyst pore size. The concentrations sulfur and vanadium in the residual asphaltenes were found to be higher for catalysts having only small and meso-pores without macropores. The results have been explained on the basis of the importance of the ratio of feed molecular size to catalyst pore size in determining the diffusion and reaction rates in residue hydroconversion." @default.
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- W1531024927 date "1996-01-01" @default.
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- W1531024927 title "Influence of catalyst pore size on asphaltenes conversion andcoke-like sediments formation during catalytic hydrocracking of kuwait vacuum residues" @default.
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- W1531024927 doi "https://doi.org/10.1016/s0167-2991(96)80019-x" @default.
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