Patent US5733839A successfully refreshed from Google Patents.
US5733839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts
Assignee: Sastech Pty Ltd
•
Filing: 1996-04-02
•
Granted: 1998-03-31
•
Expires: 2016-04-02
Abstract
Abstract To prepare a Fischer-Tropsch catalyst, a slurry comprising a particular alumina carrier, water and an active component selected from the group consisting in cobalt (Co), iron (Fe) and mixtures thereof, is subjected to a sub-atmospheric pressure environment. The alumina carrier is thereby impregnated by the active component. The impregnated carrier is dried under a sub-atmospheric pressure environment. The dried impregnated carrier is calcined, thereby to obtain the Fischer-Tropsch catalyst.
Inventors
- 👤 Rafael Luis Espinoza
- 👤 Jacobus Lucas Visagie
- 👤 Peter Jacobus Van Berge
- 👤 Franciscus Hermanus Bolder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:01
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8913; B01J23/74; B01J23/745; B01J23/75; B01J37/00; B01J37/02; B01J37/0201; C; C07; C07C; C07C1/00; C07C1/02; C07C1/04; C07C1/0425; C07C1/0445; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/745; C07C2523/75
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
72 words
A process for preparing a Fischer-Tropsch catalyst, which process comprises subjecting a slurry comprising a particulate alumina carrier, water and an active component selected from the group consisting in cobalt (Co), iron (Fe) and mixtures thereof, to a sub-atmospheric pressure environment, thereby to impregnate the alumina carrier with the active component; drying the impregnated carrier under a sub-atmospheric pressure environment; and calcining the dried impregnated carrier, thereby to obtain the Fischer-Tropsch catalyst.
Claim 2
Dependent Claim
72 words
A process for preparing a Fischer-Tropsch catalyst, which process comprises subjecting a slurry comprising a particulate alumina carrier, water and an active component selected from the group consisting in cobalt (Co), iron (Fe) and mixtures thereof, to a sub-atmospheric pressure environment, thereby to impregnate the alumina carrier with the active component; drying the impregnated carrier under a sub-atmospheric pressure environment; and calcining the dried impregnated carrier, thereby to obtain the Fischer-Tropsch catalyst.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein the sub-atmospheric pressure environment during the impregnation is at a pressure less than 20 kPa(a).
Claim 4
Dependent Claim
22 words
A process according to claim 1, wherein he sub-atmospheric pressure environment during the drying is at a pressure less than 20 kPa(a).
Claim 5
Dependent Claim
33 words
A process according to claim 1, wherein the impregnation and drying in the sub-atmospheric pressure environments is effected in a single step, so that the impregnation is effected while the drying takes place.
Claim 6
Dependent Claim
64 words
A process according to claim 1, wherein the drying in the sub-atmospheric pressure environment is continued until the moisture content of the impregnated carrier is below 20% by mass, whereafter the impregnated carrier is dried further under non-sub-atmospheric pressure conditions by passing a drying medium in co-current or counter-current fashion over the impregnated carrier at a drying temperature between 100° C. and 180° C.
Claim 7
Dependent Claim
36 words
A process according to claim 1, which includes adding to the slurry or to the impregnated uncalcined carrier, as a dopant, a minor proportion of an agent capable of enhancing the reducibility of the active component.
Claim 8
Dependent Claim
31 words
A process according to claim 6, wherein the dopant comprises copper (Cu) and/or platinum (Pt), and wherein the mass proportion of the dopant to active component is between 0,005:100 and 10:100.
Claim 9
Dependent Claim
60 words
A process according to claim 1, wherein the calcined catalyst is re-slurried with water together with at least one of the following: the active component, another active component, or, as a dopant, a minor proportion of an agent capable of enhancing the reducibility of the active component, with the resultant impregnated carrier then again being subjected to drying and calcination.
Claim 10
Dependent Claim
22 words
A process according to claim 1, wherein the calcination of the dried impregnated carrier is effected at a temperature below 350° C.
Claim 11
Dependent Claim
21 words
A process according to claim 1, which includes washing the catalyst with a washing medium, to remove unwanted surface contaminants therefrom.
Claim 12
Dependent Claim
51 words
A process according to claim 1, which includes forming the slurry by dissolving a water soluble compound of the active component in water, prior to forming the slurry with the alumina carrier, and forming of the slurry by intimately admixing the alumina carrier and the solution of the active component compound.
Claim 13
Dependent Claim
54 words
A process according to claim 11, which includes pretreating the particulate alumina carrier prior to forming the slurry thereof with the water and the active component, to modify the average diameter of its pores and/or to modify its chemical phase, by chemically pretreating the carrier and/or precalcining the carrier prior to the slurry formation.
Claim 14
Dependent Claim
24 words
A process according to claim 1, wherein the mass proportion of active component to alumina carrier in the slurry is between 5:100 and 60:100.
Claim 15
Dependent Claim
12 words
A Fischer-Tropsch catalyst, when produced by the process according to claim 1.
Claim 16
Dependent Claim
98 words
A process according to claim 1, wherein no promoter to enhance the activity of the resultant catalyst or to modify its selectivity, and which is selected from the group consisting of potassium (K), chromium (Cr), magnesium (Mg), zirconium (Zr), ruthenium (Ru), thorium (Th), hafnium (Hf), cerium (Ce), rhenium (Re), uranium (U), vanadium (V), titanium (Ti), manganese (Mn), nickel (Ni), molybdenum (Mo), wolfram (W), lanthanum (La), palladium (Pd), uranium (U), praseodymium (Pr), neodymium (Nd) and other elements from groups IA or IIA of the periodic table of the elements, is added to the slurry or to the impregnated carrier.
Claim 17
Dependent Claim
41 words
A process according to claim 1, wherein the particulate alumina carrier has pores having a minimum pore diameter of 12 nm and/or has been chemically pretreated with ammonia and/or has been calcined at a temperature between 200° C. and 1000° C.
Claim 18
Dependent Claim
104 words
A process for preparing a Fischer-Tropsch catalyst, which process comprises subjecting a slurry comprising a particulate alumina carrier having pores with a minimum pore diameter of at least 12 nm and/or having been chemically pretreated with ammonia and/or having been calcined at a temperature between 200° C. and 1000° C., water and an active component selected from the group consisting in cobalt (Co), iron (Fe) and mixtures thereof, to a sub-atmospheric pressure environment, thereby to impregnate the alumina carrier with the active component; drying the impregnated carrier under a sub-atmospheric pressure environment; and calcining the dried impregnated carrier, thereby to obtain the Fischer-Tropsch catalyst.
Claim 19
Dependent Claim
104 words
A process for preparing a Fischer-Tropsch catalyst, which process comprises subjecting a slurry comprising a particulate alumina carrier having pores with a minimum pore diameter of at least 12 nm and/or having been chemically pretreated with ammonia and/or having been calcined at a temperature between 200° C. and 1000° C., water and an active component selected from the group consisting in cobalt (Co), iron (Fe) and mixtures thereof, to a sub-atmospheric pressure environment, thereby to impregnate the alumina carrier with the active component; drying the impregnated carrier under a sub-atmospheric pressure environment; and calcining the dried impregnated carrier, thereby to obtain the Fischer-Tropsch catalyst.
References Cited (Backward Citations)
US3472794A
Cited
US3830752A
Cited
US3591649A
Cited
US3962138A
Cited
US3969271A
Cited
US4407733A
Cited
US4626521A
Cited
US4605679A
Cited
US4413064A
Cited
US4567160A
Cited
US4640908A
Cited
EP0127220A2
Cited
EP0167215A2
Cited
US4717702A
Cited
EP0266898A2
Cited
US4794095A
Cited
US4880763A
Cited
US4801573A
Cited
US4992406A
Cited
US5102851A
Cited
US5258348A
Cited
EP0434284A2
Cited
WO1992006784A1
Cited
GB2258414A
Cited
EP0535790A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-30 | 2001-09-29 | 2002-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-30 | 2005-09-29 | 2006-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-30 | 2009-09-29 | 2010-03-31 | $7700.00 | Window Closed / Lapsed |