Selective Catalysts For Naphtha Hydrodesulfurization
AssigneeExxonMobil Research and Engineering Company
InventorsSven Johan Timmler, Jason Wu
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Abstract
The invention relates to a catalyst for hydrodesulfurizing naphtha, to a method for preparing said catalyst and to a method for hydrodesulfurizing naphtha using said catalyst. More particularly, the catalyst comprises a Co/Mo metal hydrogenation component on a silica support having a defined pore size distribution and at least one organic additive. The catalyst has high dehydrosulphurisation activity and minimal olefin saturation when used to hydrodesulfurize FCC naphtha.
Claims59
A method for making a catalyst for the hydrodesulfurisation (HDS) of naphtha, the method comprising:
- (i) impregnating a silica support that has a silica content of at least about 85 wt. %, based on silica, and has a pore volume between about 0.6 cc/g and about 2.0 cc/g, and median pore sizes in the range of about 150 Å to 2000 Å with (a) an aqueous solution of a cobalt salt, (b) an aqueous solution of a molybdenum salt and at least one organic additive, said organic additive comprising at least one organic acid and at least one compound selected from the group consisting of compounds comprising at least two hydroxyl groups and 2-20 carbon atoms, and the (poly)ethers of these compounds, to form a catalyst precursor;
- (ii) drying the catalyst precursor at a temperature of less than about 350° C. to form a dried catalyst precursor;
- and
- (iii) optionally sulfiding the dried catalyst precursor, provided that the dried catalyst precursor or catalyst is not calcined prior to sulfiding or use for HDS.
A method for making a catalyst for the hydrodesulfurisation (HDS) of naphtha, the method comprising:
- (i) impregnating a silica support that has a silica content of at least about 85 wt. %, based on silica, and has a pore volume between about 0.6 cc/g and about 2.0 cc/g, and median pore sizes in the range of about 150 Å to 2000 Å with (a) an aqueous solution of a cobalt salt and (b) an aqueous solution of a molybdenum salt to form a first catalyst precursor;
- (ii) drying the first catalyst precursor at a temperature of less than about 350° C. to form a first dried catalyst precursor;
- (iii) impregnating the dried catalyst precursor with (c) at least one organic acid and at least one organic additive, the organic additive comprising at least one compound selected from the group consisting of compounds comprising at least two hydroxyl groups and 2-20 carbon atoms, and the (poly)ethers of these compounds, to form a second catalyst precursor;
- (iv) optionally drying the second catalyst precursor to form a second dried catalyst precursor;
- and
- (v) optionally sulfiding the second catalyst precursor, provided that the second dried catalyst precursor or catalyst is not calcined prior to sulfiding or use for HDS.
A method for making a catalyst for the hydrodesulfurisation (HDS) of naphtha, the method comprising:
- (i) regenerating a spent catalyst comprising a silica support that has a silica content of at least about 85 wt. %, based on silica, and has a pore volume between about 0.6 cc/g and about 2.0 cc/g, and median pore sizes in the range of about 150 Å to 2000 Å, into which a cobalt salt and a molybdenum salt have been impregnated, to form a regenerated catalyst
- (ii) impregnating the regenerated catalyst with at least one organic additive, said organic additive comprising at least one organic acid and at least one compound selected from the group consisting of compounds comprising at least two hydroxyl groups and 2-20 carbon atoms, and the (poly)ethers of these compounds, to form a catalyst precursor;
- (ii) drying the catalyst precursor at a temperature of less than about 350° C. to form a dried catalyst precursor;
- and
- (iii) optionally sulfiding the dried catalyst precursor, provided that the dried catalyst precursor or catalyst is not calcined prior to sulfiding or use for HDS.
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A catalyst comprising a silica support that has a silica content of at least about 85 wt. %, based on silica, and has a pore volume between about 0.6 cc/g and about 2.0 cc/g, and median pore sizes in the range of about 150 Å to 2000 Å, said silica support having impregnated therein a cobalt salt, a molybdenum salt and at least one organic additive, said organic additive comprising at least one organic acid and at least one compound selected from the group consisting of compounds comprising at least two hydroxyl groups and 2-20 carbon atoms, and the (poly)ethers of these compounds.
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Dependencies are inferred from the claim text.