EP0434284A2
Expired / Lapsed
EP
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Selective catalysts and their preparation for catalytic hydrocarbon synthesis
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1990-12-11
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Granted: —
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Expires: 2010-12-11
Abstract
Abstract Supported catalysts for Fischer-Tropsch processes prepared by contacting a suitable support with a catalyst in the form of a metal salt and depositing the catalyst on the support. Where rim type catalyst are preferred, a molten salt starting material is used. For non-rim type catalyst, such as powdered catalyst, catalytic metal salt-solution starting materials may be used. The catalyst is prepared without high temperature calcination of the catalyst before reduction by reducing the salt directly on the support to the metal. During the reduction step, the heating rate is a slow single steady heating rate.
Inventors
- 👤 Enrique Iglesia
- 👤 Hilda Vroman
- 👤 Stuart Leon Soled
- 👤 Joseph Baumgartner
- 👤 Rocco Anthony Fiato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 07:36
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/16; B01J37/18; B01J23/00; B01J23/70; B01J23/74; B01J23/75; C; C07; C07C; C07C1/00; C07C1/02; C07C1/04; C07C1/0425; C07C1/0445; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2521/08; C07C2521/10; C07C2521/12; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/75
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
117 words
A method of preparing a supported cobalt catalyst particle which comprises: (a) contacting a support particle with a catalyst metal salt selected from molten salts and dissolved solution salts, the contacting being done for a period sufficient to deposit the catalyst metal salt on the support; (b) removing any liquid-phase component from the particle produced in step (a), and; (c) reducing catalyst metal in the particle produced in step (b) to metallic form by heating the particle in the presence of H₂, wherein the heating rate is a single steady rate of less than about 1°C/min. to a maximum temperature in the range of from about 200°C to about 500°C, to produce a supported metal catalyst particle.
Claim 2
Dependent Claim
23 words
The method of claim 1 wherein the heating rate is a single steady rate of less than about 0.4°C/min. (e.g., 0.2°C/min. or less).
Claim 3
Dependent Claim
45 words
The method of claim 1 or claim 2 wherein the catalyst metal salt is a molten salt at a temperature between its melting point and its decomposition temperature and wherein the contacting occurs in the substantial absence of water other than any water of hydration.
Claim 4
Independent Claim
23 words
The method of any one of claims 1 to 3 wherein the dissolved solution salt contains solvent as a component of the solution.
Claim 5
Independent Claim
20 words
The method of any one of claims 1 to 4 wherein the catalyst metal component comprises or consists of cobalt.
Claim 6
Independent Claim
22 words
The method of any one of claims 1 to 5 wherein the catalyst metal salt is cobalt nitrate or hydrated cobalt nitrate.
Claim 7
Independent Claim
25 words
The method of any one of claims 1 to 6 wherein the metal salt is contacted with the support for less than about 10 seconds.
Claim 8
Independent Claim
28 words
The method of any one of claims 1 to 7 wherein the support is selected from the group consisting of silica, magnesia, alumina, silica-alumina, titania, and mixtures thereof.
Claim 9
Independent Claim
197 words
A method according to any one of claims 1 to 8 of preparing a supported cobalt rim-type catalyst particle which comprises: (a) contacting an inorganic refractory oxide support particle with a molten cobalt salt, in the substantial absence of water other than any water of hydration, at sufficient viscosity and loading conditions to prevent capillary action within the support material from allowing the transport of salt cobalt salt into the interior regions of the support, for a period of time sufficient to deposit at least 95 wt.% of the cobalt in a rim of less than about 200 um in thickness from the external surface of the particle; (b) removing any liquid-phase material from the particle produced in step (a); and (c) reducing cobalt component in the particle from step (b) to metallic cobalt by heating the particle in the presence of H₂, wherein the heating rate is a single steady rate of less than about 1°C/min. to a maximum temperature in the range of from about 200°C to about 500°C and wherein the molten cobalt salt is at a temperature between its melting point and its decomposition temperature to produce a supported cobalt rim-type catalyst particle.
Claim 10
Dependent Claim
32 words
The method of claim 9 comprising recovering a catalyst particle having a cobalt dispersion of greater than about 4% and a cobalt site density of at least about 0.05 g-atom surface Co/liter.
Claim 11
Independent Claim
24 words
The method of any one of claims 1 to 10 wherein the support has a surface area in the range of from 50-500 m²/gm.
Claim 12
Dependent Claim
75 words
A cobalt catalyst particle prepared by the method of any one of claims 1 to 11 comprising cobalt on a support (e.g., silica) wherein substantially all of the cobalt is located in a rim of less than about 200 um thickness from the external surface of the particle, the degree of dispersion of the cobalt is greater than about 4% and the cobalt site density is at least about 0.05 g-atom surface Co/liter of particles.
Claim 13
Dependent Claim
18 words
The particle of claim 14 wherein the surface area of the support is at least about 50 m²/gm.
References Cited (Backward Citations)
No citation records indexed.
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