| 摘要 |
The invention pertains to a hydroprocessing catalyst comprising 7-20 wt.% of a Group VIB hydrogenation metal component, calculated as trioxide, 0.5-6 wt.% of a non-noble Group VIII hydrogenation metal component, calculated as oxide, and 0.1-2 wt.% of an alkali metal component, calculated as oxide, on a carrier, wherein the carrier comprises at least 3.5 wt.% of silica, calculated on the catalyst, the catalyst having a surface area of at least 150m2/g, a total pore volume of at least 0.55 ml/g, and a pore size distribution which is such that 30-80% of the pore volume is present in pores with a diameter of 100-200 .ANG., and at least 5% of the pore volume is present in pores with a diameter above 1000 .ANG.. Preferably, the catalyst has less than 25% of the total po re volume in pores with a diameter of less than 100 .ANG.. The invention also pertains to the use of this catalyst in hydroprocessing of heavy hydrocarbon feedstocks, e.g., in an ebullated bed process, particularly a feedstock at least 50 wt.% of which boils above 538.degree.C (1,000.degree.F) and which comprises at least 2 wt.% of sulphur and at least 5 wt.% of Conradson carbon. The catalyst according to the invention gives good contaminant removal with less sludge formation than prior art catalysts.
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