US3963646A
Expired / Lapsed
US
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Methods for the manufacture of composite catalysts containing a composition of a transition metal on a support
Assignee: Bpifrance Financement SA
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Filing: 1973-08-02
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Granted: 1976-06-15
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Expires: 1993-08-02
Abstract
Abstract Starting from hydrolysable salts of at least one transition metal and at least one metal giving a refractory oxide in solution in a non-aqueous solvent, simultaneous hydrolysis of the salts is produced by the addition of an amount of water which corresponds substantially to that necessary for the stoichiometry of the reactions. Drying of the coprecipitate formed is effected in an autoclave under hypercritical conditions. Hydrogenation or controlled oxidation catalysts of greater activity are thereby produced.
Inventors
- 👤 Stanislas Teichner
- 👤 Gerard Gardes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:36
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; B; B01; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/755; B01J37/00; B01J37/02; B01J37/03; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/10; C07C45/00; C07C45/27; C07C45/32; C07C45/33; C07C45/34; C07C45/35; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/12; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/755; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
143 words
A method for the preparation of a composite catalyst, starting from a solution in a non-aqueous solvent of a compound of at least one transition metal and of a salt of at least one metal able to provide a refractory oxide, each of said compounds being selected among those of said metals which are both hydrolysable by water to form the corresponding hydroxides and soluble in said non-aqueous solvent, which method comprises adding to said solution an amount of water sufficient to cause hydrolysis of said salts and treating the reaction medium with a non-aqueous and volatile solvent in an amount and under conditions of temperature and pressure that result in the critical point of said solvent being reached and even exceeded thereby causing all the solvent to be in the form of vapor and removing the solvent vapor from said reaction medium.
Claim 2
Independent Claim
143 words
A method for the preparation of a composite catalyst, starting from a solution in a non-aqueous solvent of a compound of at least one transition metal and of a salt of at least one metal able to provide a refractory oxide, each of said compounds being selected among those of said metals which are both hydrolysable by water to form the corresponding hydroxides and soluble in said non-aqueous solvent, which method comprises adding to said solution an amount of water sufficient to cause hydrolysis of said salts and treating the reaction medium with a non-aqueous and volatile solvent in an amount and under conditions of temperature and pressure that result in the critical point of said solvent being reached and even exceeded thereby causing all the solvent to be in the form of vapor and removing the solvent vapor from said reaction medium.
Claim 3
Dependent Claim
25 words
Method according to claim 1, wherein the amount of water used for said hydrolysis corresponds substantially to that necessary for the stoichiometry of the reactions.
Claim 4
Dependent Claim
58 words
A method according to claim 1 wherein said hydrolysis is effected with the amount of water required by the stoichiometry of the hydrolysis reaction and wherein the reaction medium is heated in a closed autoclave, the amount of solvent used initially being such that the critical temperature can be reached and even exceeded under the corresponding pressure conditions.
Claim 5
Dependent Claim
27 words
Method according to claim 1, wherein the metals of the hydrolysable salts of the transition metals which are utilised belong to Group VIII of the Periodic Classification.
Claim 6
Dependent Claim
23 words
Method according to claim 1, wherein the salt of the abovesaid transition metal is a salt of nickel, of iron or of cobalt.
Claim 7
Dependent Claim
18 words
Method according to claim 1, wherein the salt of the said transition metal is a salt of nickel.
Claim 8
Dependent Claim
23 words
Method according to claim 1, wherein the salt of the abovesaid refractory metal is a salt of aluminum, of silicon or of magnesium.
Claim 9
Dependent Claim
20 words
Method according to claim 1, wherein the drying of the coprecipitate in the autoclave is effected in a reducing atmosphere.
Claim 10
Dependent Claim
19 words
Method according to claim 1, wherein the abovesaid salts are constituted by alcoholates or acetates of the metals concerned.
Claim 11
Dependent Claim
21 words
Method according to claim 1, wherein the hydrolysing medium is constituted by a homogeneous water-alcohol mixture, or a heterogeneous water-toluene mixture.
Claim 12
Dependent Claim
34 words
Method according to claim 1, wherein the ratio of the number of atoms of metal of the catalysing substance to the number of atoms of the refractory substance is comprised between 1/5 and 3/5.
Claim 13
Dependent Claim
36 words
Method according to claim 8, wherein the ratio of the number of atoms of metal of the catalysing substance to the number of atoms of metal of the refractory substance is comprised between 1/5 and 1/1.
References Cited (Backward Citations)
FR1568817A
Cited
US3637529A
Cited
US3591649A
Cited
US3547830A
Cited
US3551352A
Cited
US3752773A
Cited
US3781350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |