Manganese titanate-containing fischer-tropsch catalyst and methods for making and using same
OwnerAlexander James Patersoninventor
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Abstract
The present disclosure relates generally to titania-supported Fischer-Tropsch catalysts incorporating manganese titanate, methods of making and use thereof. In one aspect, the present disclosure provides a titania-supported Fischer-Tropsch catalyst precursor comprising a titania support, and disposed on the titania support, manganese in the range of 1 wt % to 20 wt %, calculated as manganese (0); wherein at least 10 at % of the manganese is in the form of MnTiO3.
Claims17
A titania-supported Fischer-Tropsch catalyst precursor comprising:
- a titania support, and disposed on the titania support,
- manganese in the range of 1 wt % to 50 wt %, calculated as manganese (0);
- wherein at least 10 at % of the manganese is in the form of MnTiO3 to form a catalyst support.
A process for the production of a titania-supported Fischer-Tropsch catalyst precursor, the process comprising:
- providing a first catalyst precursor comprising a manganese oxide disposed on a titania support, wherein the support precursor comprises no cobalt;
- and
- contacting the first catalyst precursor with a reducing gas at a temperature of at least 350° C., for a time sufficient to provide a second catalyst precursor in which at least 10 at % of manganese is present as MnTiO3.
A process for the production of hydrocarbons, comprising contacting a MnTiO3 containing supported Fischer-Tropsch catalyst containing at least 1 wt % cobalt and 1 wt % manganese with a gaseous reaction mixture comprising H2 and CO in a ratio in the range of 1:1 to 3:1, wherein the process has a selectivity for alcohols of no more than 20%.
A method for controlling the selectivity of a Fischer-Tropsch catalyst, the method comprising:
- (i) providing a titania-supported Fischer-Tropsch synthesis catalyst precursor comprising manganese in an amount of at least 1 wt %, as calculated as manganese (0);
- and
- (ii) contacting the catalyst with a reducing gas at a temperature of at least 350° C. for a time sufficient to provide a second catalyst precursor in which at least 10 at % of manganese is present as MnTiO3;
- (iii) impregnating the second catalyst precursor with a cobalt salt;
- (iv) calcining at a temperature in the range of 200° C. to 450° C.;
- (v) contacting the calcined catalyst with a reducing gas at a temperature of no more than 300° C. to produce the Fischer-Tropsch catalyst, wherein
- the Fischer-Tropsch catalyst has a selectivity for alcohols that is no more than 50% of a selectivity for alcohols of an equivalent catalyst contacted with a reducing gas in step (ii) at a temperature of 300° C. for the same amount of time.
A method for producing a supported Fischer-Tropsch catalyst, the method comprising:
- a) providing a first catalyst support precursor comprising manganese salt disposed on a titania support, wherein the first catalyst precursor comprises no cobalt;
- and optionally calcining in an oxygen containing atmosphere to form a support precursor
- b) contacting the first catalyst support precursor with a reducing gas at a temperature of at least 350° C., for a time sufficient to provide a titania-supported Fischer Tropsch catalyst precursor in which at least 10 at % of manganese is present as MnTiO3;
- c) contacting the catalyst precursor with a decomposable cobalt salt and calcining at a temperature in the range of 200° C. to 450° C. in an oxygen containing atmosphere, wherein the MnTiO3 phase is at least partially decomposed
- d) reducing the catalyst precursor with a reducing gas at a temperature of no more than 350° C. to form the titania-supported Fischer-Tropsch catalyst wherein the final catalyst has at least 10 at % of manganese is present as MnTiO3.
Dependencies are inferred from the claim text.