High surface area, small crystallite size catalyst for Fischer-Tropsch synthesis
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-023/00
B01J-021/00
B01J-020/00
B01J-029/06
B01J-029/00
출원번호
UP-0214809
(2008-06-20)
등록번호
US-7585812
(2009-09-22)
발명자
/ 주소
Hu, X. D.
Loi, Patrick J.
O'Brien, Robert J.
출원인 / 주소
Sud Chemie Inc.
인용정보
피인용 횟수 :
21인용 특허 :
52
초록
A catalyst for use in the Fischer-Tropsch process, and a method to prepare the catalyst is disclosed. The catalyst of the present invention has a higher surface area, more uniform metal distribution, and smaller metal crystallite size than Fischer-Tropsch catalysts of the prior art.
대표청구항▼
What is claimed is: 1. A method for making a catalyst for use in a Fischer-Tropsch process, the catalyst comprising at least one metal that is an efficient carbon monoxide adsorber and at least one promoter dispersed on a support to form a plurality of catalyst particles, the catalyst particles hav
What is claimed is: 1. A method for making a catalyst for use in a Fischer-Tropsch process, the catalyst comprising at least one metal that is an efficient carbon monoxide adsorber and at least one promoter dispersed on a support to form a plurality of catalyst particles, the catalyst particles having a BET surface area from about 100 m2/g to about 250 m2/g and an essentially smooth, homogenous surface morphology, the metal and promoter being dispersed on the support such that the catalyst has a metal oxide crystalline size from about 40 Å to about 200 Å, the method comprising: a) adding the support to water with agitation to form a slurry and maintaining the slurry at a temperature from about 35° C. to about 210° C.; b) adding an aqueous metal salt solution to the slurry with agitation while maintaining the slurry temperature from about 65° C. to about 120° C., wherein the aqueous metal salt solution has a pH value greater than a point of zero charge of the support; c) agitating the slurry and maintaining the slurry temperature from about 65° C. to about 120° C. until the metal salt is essentially completely reacted with the support; d) separating the slurry into a solid portion and a liquor portion; e) washing the solid portion with water; f) drying and calcining the solid portion from about 90° C. to about 375° C. to form a plurality of catalyst particles; g) impregnating the catalyst particles with at least one promoter; and h) reducing the catalyst particles by heating the particles from ambient temperature to a temperature ranging from about 300° C. to about 500° C. at a rate of from about 0.1° C./min to about 10° C./min over a period ranging from about 5 hours to about 41 hours. 2. The method of claim 1 wherein the slurry temperature is maintained from about 65° C. to about 120° C. in step a). 3. The method of claim 1 wherein the solid portion is dried from about 120° C. to about 260° C. in step f). 4. The method of claim 1 wherein the catalyst particles are reduced in step h) by heating the particles from ambient temperature to about 350° C. at a rate of about 1.0° C./min and then holding the particles at about 350° C. from about 12 hours to about 16 hours. 5. The method of claim 1 further including coating the catalyst particles with oil after step h). 6. The method of claim 1 wherein in step f), the promoter is impregnated onto the catalyst particles by dipping the catalyst particles in an aqueous solution of the promoter while maintaining agitation, and then separating the impregnated catalyst particles from the solution, and drying the impregnated catalyst particles. 7. A catalyst for use in a Fischer-Tropsch process, the catalyst comprising at least one metal that is an efficient carbon monoxide adsorber and at least one promoter dispersed on a support to form a plurality of catalyst particles, the catalyst particles having a BET surface area from about 100 m2/g to about 250 m2/g and an essentially smooth, homogenous surface morphology, the metal and promoter being dispersed on the support such that the catalyst has a metal oxide crystalline size from about 40 Å to about 200 Å, the catalyst being made by a method comprising: a) adding the support to water with agitation to form a slurry and maintaining the slurry at a temperature from about 35° C. to about 210° C.; b) adding an aqueous metal salt solution to the slurry with agitation while maintaining the slurry temperature from about 65° C. to about 120° C., wherein the aqueous metal salt solution has a pH value greater than a point of zero charge of the support; c) agitating the slurry and maintaining the slurry temperature from about 65° C. to about 120° C. until the metal salt is essentially completely reacted with the support; d) separating the slurry into a solid portion and a liquor portion; e) washing the solid portion with water; f) drying and calcining the solid portion from about 90° C. to about 375° C. to form a plurality of catalyst particles; g) impregnating the catalyst particles with at least one promoter; and h) reducing the catalyst particles by heating the particles from ambient temperature to a temperature ranging from about 300° C. to about 500° C. at a rate of from about 0.1° C./min to about 10° C./min over a period ranging from about 5 hours to about 41 hours. 8. The catalyst of claim 7 wherein the metal is selected from the group consisting of nickel, cobalt, and iron, ruthenium, osmium, platinum, palladium, iridium, rhenium, molybdenum, chromium, tungsten, vanadium, rhodium, copper, zinc and combinations thereof. 9. The catalyst of claim 7 wherein the metal is cobalt. 10. The catalyst of claim 7 wherein the support is selected from the group consisting of aluminum oxide, γ-alumina, alumina monohydrate, alumina trihydrate, alumina-silica, silica, silicate, silicalite, y-zeolite, mordenite, titania, thoria, zirconia, niobia, hydrotalcite, kieselguhr, attapulgite clay, zinc oxide, other clays, other zeolites and combinations thereof. 11. The catalyst of claim 7 wherein the support is aluminum oxide. 12. The catalyst of claim 7 wherein the support is γ-alumina. 13. The catalyst of claim 7 wherein the aqueous metal salt solution comprises water and a complex of a divalent metal having coordination sphere ligands selected from the group consisting of water, chloride ion, ammonia, pyridine, triphenylphospine, 1,2-diaminoethane, diethylenetriamine, triethylenetetraamine, acetate, oxlate, 2,4-pentanedione, ethylenedinitrilo tetraacetic acid, and combinations thereof. 14. The catalyst of claim 7 wherein the aqueous metal salt solution comprises water and a complex of a divalent cobalt having coordination sphere ligands selected from the group consisting of water, ammonia, pyridine, 1,2-diaminoethane, diethylenetriamine, triethylenetetraamine, and combinations thereof. 15. The catalyst of claim 14 wherein the complex of divalent cobalt is hexaammine cobalt (II) carbonate. 16. The catalyst of claim 7 wherein the support has a particle size of about 60 μm to about 150 μm, a surface area from about 90 m2/g to about 210 m2/g, a pore volume from about 0.35 ml/g to about 0.50 ml/g, and a pore diameter from about 8 nm to about 20 nm. 17. The catalyst of claim 7 wherein the promoter is a metal salt selected from the group consisting of rhenium (VII) oxide, ruthenium nitrosyl nitrate, platinum chloride, platinum ammine nitrate, platinum ammine chloride, and combinations thereof. 18. The catalyst of claim 7 wherein the catalyst particles comprise about 5 wt % to about 60 wt % cobalt, about 0.0001 wt % to about 1 wt % of a first promoter, and about 0.01 wt % to about 5 wt % of a second promoter. 19. The catalyst of claim 7 wherein the catalyst particles comprise about 10 wt % to about 30 wt % cobalt, about 0.01 wt % to about 0.05 wt % of a first promoter, and about 0.1 wt % to about 1 wt % of a second promoter. 20. The catalyst of claim 19 wherein the first promoter and second promoter are selected from the group consisting of boron, cerium, chromium, copper, iridium, iron, lanthanum, manganese, molybdenum, palladium, platinum, rhenium, rhodium, ruthenium, strontium, tungsten, vanadium, zinc, sodium oxide, potassium oxide, rubidium oxide, cesium oxide, magnesium oxide, titanium oxide, zirconium oxide, scandium, yttrium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and combinations thereof.
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