| 摘要 |
A process for the hydrodesulfurization of residua. A residuum is contacted with a high activity maintenance catalyst comprising an oxide or sulfide of cobalt or nickel and an oxide or sulfide of molybdenum or tungsten deposited on a silica-stabilized alumina support, having a maximum of its surface area in pores having 30 to 80 A diameters. A preferred catalyst is characterized as one having at least 180 M2/g. of surface area in pores with diameters ranging from 30 to 80 A, and less than 0.25 cc./g. of the pore volume in pores having a diameter greater than 100 A.
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