US4176089A
Expired / Lapsed
US
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Process for the preparation of silica-titania and catalysts comprising the same
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1978-08-03
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Granted: 1979-11-27
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Expires: 1998-08-03
Abstract
Abstract High surface area, low bulk density silica-titania materials which are particularly effective as catalysts or catalyst supports are prepared by mixing a silicon alkoxide, a titanium alkoxide and an organic diluent, adding the resulting premixed alkoxides to a hydrolysis medium comprising water and a solvent to form a silica-titania precipitate, separating the silica-titania precipitate from the hydrolysis medium, drying and calcining the precipitate and recovering the resulting high surface area silica-titania product.
Inventors
- 👤 Neville L. Cull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:11
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/06; B01J21/063; B01J29/00; B01J29/89; B01J37/00; B01J37/02; B01J37/03; B01J37/031; B01J37/033
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
53 words
A process for the preparation of a silica-titania composition which comprises the steps of: (a) mixing a silicon alkoxide, titanium alkoxide and an organic diluent, and (b) adding the resulting mixed alkoxides mixture to a hydrolysis mixture comprising water and an organic solvent to hydrolyze said mixed alkoxides and form a silica-titania precipitate.
Claim 2
Dependent Claim
53 words
A process for the preparation of a silica-titania composition which comprises the steps of: (a) mixing a silicon alkoxide, titanium alkoxide and an organic diluent, and (b) adding the resulting mixed alkoxides mixture to a hydrolysis mixture comprising water and an organic solvent to hydrolyze said mixed alkoxides and form a silica-titania precipitate.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein said silica-titania composition has a surface area ranging from about 100 to about 400 m 2 /g and a bulk density ranging from about 0.2 to about 0.60 g/cc.
Claim 4
Dependent Claim
35 words
The process of claim 1 wherein said silica-titania composition has a surface area ranging from about 200 to about 400 m 2 /g and a bulk density ranging from about 0.3 to about 0.6 g/cc.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein said silica-titania composition comprises from about 53 to about 91 weight percent titania.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said organic diluent comprises an alcohol.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein said organic solvent in said hydrolysis mixture is an alcohol.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the molar ratio of silicon alkoxide to titanium alkoxide in step (a) ranges from about 0.05:1 to 10:1.
Claim 9
Dependent Claim
21 words
The process of claim 1 wherein the molar ratio of silicon alkoxide to titanium alkoxide in step (a) is about 1:1.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein the hydrolysis of step (b) is conducted at a temperature ranging from about 25 to about 100° C.
Claim 11
Dependent Claim
26 words
The process of claim 1 wherein said mixed alkoxides mixture is added to said hydrolysis mixture at a rate of about 2 to about 6 cc/minute.
Claim 12
Dependent Claim
31 words
The process of claim 1 wherein said alkoxide constituent of said silicon alkoxide and of said titanium alkoxide is selected from the group consisting of C 1 to C 20 alkoxides.
Claim 13
Dependent Claim
26 words
The process of claim 1 wherein said alcohol diluent used in step (a) is selected from the groups consisting of C 1 to C 4 alcohols.
Claim 14
Dependent Claim
27 words
The process of claim 3 wherein said alcohol solvent used in said hydrolysis mixture is selected from the group consisting of C 1 to C 4 alcohols.
Claim 15
Dependent Claim
24 words
The process of claim 1 wherein said water is present in said hydrolysis mixture in an amount sufficient to hydrolyze theoretically completely said alkoxides.
Claim 16
Dependent Claim
33 words
The process of claim 1 wherein said organic solvent is present in said hydrolysis mixture in an amount ranging from about 50 to about 95 volume percent based on the total hydrolysis mixture.
Claim 17
Dependent Claim
22 words
The process of claim 1 wherein said silica-titania precipitate is separated from said hydrolysis mixture and wherein the separated precipitate is calcined.
Claim 18
Dependent Claim
21 words
The process of claim 16 wherein said calcination is conducted at a temperature ranging from about 400 to about 800° C.
Claim 19
Dependent Claim
16 words
The process of claim 16 wherein prior to said calcination step, said precipitate is air dried.
Claim 20
Dependent Claim
88 words
A process for the preparation of a catalyst which comprises compositing a metal or a compound of a metal selected from the group consisting of Groups IB, IIA, IIB, IVA, IVB, VIB, VIIB and VIII and mixtures thereof and a silica-titania composition prepared by steps which comprise: (a) mixing a silicon alkoxide, a titanium alkoxide and an organic diluent, and (b) adding the resulting mixed alkoxides mixture to a hydrolysis mixture comprising water and an organic solvent to hydrolyze said mixed alkoxides and to form a silica-titania precipitate.
Claim 21
Dependent Claim
88 words
A process for the preparation of a catalyst which comprises compositing a metal or a compound of a metal selected from the group consisting of Groups IB, IIA, IIB, IVA, IVB, VIB, VIIB and VIII and mixtures thereof and a silica-titania composition prepared by steps which comprise: (a) mixing a silicon alkoxide, a titanium alkoxide and an organic diluent, and (b) adding the resulting mixed alkoxides mixture to a hydrolysis mixture comprising water and an organic solvent to hydrolyze said mixed alkoxides and to form a silica-titania precipitate.
Claim 22
Dependent Claim
35 words
The process of claim 19 wherein said silica-titania composition has a surface area ranging from about 100 to about 400 m 2 /g and a bulk density ranging from about 0.2 to about 0.6 g/cc.
Claim 23
Dependent Claim
35 words
The process of claim 19 wherein said silica-titania composition has a surface area ranging from about 200 to about 400 m 2 /g and a bulk density ranging from about 0.3 to about 0.6 g/cc.
Claim 24
Dependent Claim
19 words
The process of claim 19 wherein said silica-titania composition comprises from about 53 to about 91 weight percent titania.
Claim 25
Dependent Claim
12 words
The process of claim 19 wherein said organic diluent comprises an alcohol.
Claim 26
Dependent Claim
16 words
The process of claim 19 wherein said organic solvent in said hydrolysis mixture is an alcohol.
Claim 27
Dependent Claim
24 words
The process of claim 19 wherein the molar ratio of silicon alkoxide to titanium alkoxide in step (a) ranges from about 0.05:1 to 10:1.
Claim 28
Dependent Claim
20 words
The process of claim 19 wherein the molar ratio of siliconalkoxide to titanium alkoxide in step (a) is about 1:1.
Claim 29
Dependent Claim
24 words
The process of claim 19 wherein the hydrolysis of step (b) is conducted at a temperature ranging from about 25° to about 100° C.
Claim 30
Dependent Claim
26 words
The process of claim 19 wherein said mixed alkoxides mixture is added to said hydrolysis mixture at a rate of about 2 to about 6 cc/minute.
Claim 31
Dependent Claim
31 words
The process of claim 19 wherein said alkoxide constituent of said silicon alkoxide and of said titanium alkoxide is selected from the group consisting of C 1 to C 20 alkoxides.
Claim 32
Dependent Claim
26 words
The process of claim 19 wherein said alcohol diluent used in step (a) is selected from the group consisting of C 1 to C 4 alcohols.
Claim 33
Dependent Claim
27 words
The process of claim 19 wherein said alcohol solvent used in said hydrolysis mixture is selected from the group consisting of C 1 to C 4 alcohols.
Claim 34
Dependent Claim
24 words
The process of claim 19 wherein said water is present in said hydrolysis mixture in an amount sufficient to hydrolyze theoretically completely said alkoxides.
Claim 35
Dependent Claim
33 words
The process of claim 19 wherein said organic solvent is present in said hydrolysis mixture in an amount ranging from about 50 to about 95 volume percent based on the total hydrolysis mixture.
Claim 36
Dependent Claim
22 words
The process of claim 19 wherein said silica-titania precipitate is separated from said hydrolysis mixture and wherein said separated precipitate is calcined.
Claim 37
Dependent Claim
21 words
The process of claim 34 wherein said calcination is conducted at a temperature ranging from about 400° to about 800° C.
Claim 38
Dependent Claim
16 words
The process of claim 34 wherein prior to said calcination step, said precipitate is air dried.
Claim 39
Dependent Claim
38 words
The process of claim 19 wherein said metal or compound of said metal composited with said silica-titania is selected from the group consisting of metals or compounds of copper, iron, chromium, vanadium, and the group VIII noble metals.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |