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US 12,697,605 B2Granted
Process for producing a Fischer-Tropsch synthesis catalyst and Fischer-Tropsch start-up process
AssigneeBp P.L.C.
InventorsAlexander James Paterson, Richard J Mercer, John West
Life of this patent
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Abstract
The present invention relates to a process for producing a Fischer-Tropsch synthesis catalyst wherein from 15 to 40 mol. % of the cobalt thereon is in the form of cobalt oxide. The present invention also relates to a start-up process for a reduced-and-passivated cobalt-containing Fischer-Tropsch catalyst, wherein from 15 to 40 mol. % of the cobalt thereon is in the form of cobalt oxide and the reduced-and-passivated catalyst is activated by contacting the catalyst with a syngas stream.
Claims24
A process for producing a reduced-and-passivated cobalt-containing Fischer-Tropsch catalyst, the process comprising the following steps:
- (a) contacting a cobalt-containing Fischer-Tropsch catalyst with a reducing gas under conditions suitable to produce a reduced cobalt-containing Fischer-Tropsch catalyst;
- (b) under a non-oxidising atmosphere, adjusting the temperature of the reduced cobalt-containing Fischer-Tropsch catalyst to a temperature in the range of from 0° C. to 200° C.;
- (c) contacting the reduced cobalt-containing Fischer-Tropsch catalyst with an oxygen-containing gas stream comprising from 0.1% v/v to 5% v/v oxygen with the balance being an inert gas, at a temperature in the range of from 0° C. to 200° C., in order to produce a reduced-and-passivated cobalt-containing Fischer-Tropsch catalyst;
- wherein, in step (c), the amount of oxygen in the oxygen-containing gas stream, and the temperature, are selected and maintained to produce a reduced-and-passivated cobalt-containing Fischer-Tropsch catalyst wherein from 15 to 40 mol. % of the cobalt thereon is in the form of cobalt oxide;
- and
- wherein the amount of oxygen in the oxygen-containing gas stream, and the temperature, are selected by the steps of:
- (i) performing steps (a) to (c) of the method for a Fischer-Tropsch catalyst having a given composition and under a given set of process conditions at a first temperature and using an oxygen-containing gas stream having a first oxygen content to produce a test catalyst;
- (ii) determining the proportion of cobalt on the test catalyst that is in the form of cobalt oxide by performing temperature programmed reduction of the test catalyst;
- (iii) if the proportion of cobalt on the test catalyst that is in the form of cobalt oxide is outside the range of from 15 to 40 mol. %, repeating steps (i) and (ii) at a second temperature, different to the first temperature, and/or a second oxygen content, different to the first oxygen content.
6 more elements
A start-up process for a Fischer-Tropsch catalyst, the start-up process comprising the steps of:
- (a) contacting a cobalt-containing Fischer-Tropsch catalyst with a reducing gas under conditions suitable to produce a reduced cobalt-containing Fischer-Tropsch catalyst;
- (b) under a non-oxidising atmosphere, adjusting the temperature of the reduced cobalt-containing Fischer-Tropsch catalyst to a temperature in the range of from 0° C. to 200° C.;
- (c) contacting the reduced cobalt-containing Fischer-Tropsch catalyst with an oxygen-containing gas stream comprising from 0.1% v/v to 5% v/v oxygen with the balance being an inert gas, at a temperature in the range of from 0° C. to 200° C., in order to produce a reduced-and-passivated cobalt-containing Fischer-Tropsch catalyst;
- wherein, in step (c), the amount of oxygen in the oxygen-containing gas stream, and the temperature, are selected and maintained to produce a reduced-and-passivated cobalt-containing Fischer-Tropsch catalyst wherein from 15 to 40 mol. % of the cobalt thereon is in the form of cobalt oxide;
- and
- wherein the amount of oxygen in the oxygen-containing gas stream, and the temperature, are selected by the steps of:
- (i) performing steps (a) to (c) of the start-up process for a Fischer-Tropsch catalyst having a given composition and under a given set of process conditions at a first temperature and using an oxygen-containing gas stream having a first oxygen content to produce a test catalyst;
- (ii) determining the proportion of cobalt on the test catalyst that is in the form of cobalt oxide by performing temperature programmed reduction of the test catalyst;
- (iii) if the proportion of cobalt on the test catalyst that is in the form of cobalt oxide is outside the range of from 15 to 40 mol. %, repeating steps (i) and (ii) at a second temperature, different to the first temperature, and/or a second oxygen content, different to the first oxygen content
- (d) contacting the reduced cobalt-containing Fischer-Tropsch catalyst with a syngas gas stream under conditions suitable to activate the catalyst for Fischer-Tropsch synthesis;
- (e) optionally adjusting the temperature to the desired reaction temperature for performing Fischer-Tropsch synthesis with the activated catalyst from step (d).
8 more elements
Dependencies are inferred from the claim text.