US4766101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina-based catalyst carriers having improved durability/mechanical strength/aging resistance
Assignee: Rhone Poulenc Specialites Chimiques
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Filing: 1985-12-04
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Granted: 1988-08-23
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Expires: 2005-12-04
Abstract
Abstract Durable, aging-resistant alumina-based catalyst carriers having improved mechanical strength are facilely prepared by (i) impregnating an alumina-based catalyst carrier with an aqueous solution of a quaternary ammonium silicate, (ii) drying said impregnated carrier, and (iii) calcining said dried carrier.
Inventors
- 👤 Patrice Nortier
- 👤 Thierry Dupin
- 👤 Bertrand Latourrette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:33
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/10; B01J21/00; B01J21/12; B01J23/02
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
76 words
A process for the preparation of a durable, aging-resistant alumina-based catalyst carrier having improved mechanical strength, comprising (i) impregnating an agglomerated alumina-based catalyst carrier with an aqueous solution of a quaternary ammonium silicate of general formula: (SiO.sub.2+x.sup.2x- +2×N.sup.+ R.sub.4) wherein R is a hydrocarbon radical and in which the ratio r, the number of moles of Si/number of moles of N, is less than 15, (ii) drying said impregnated carrier, and (iii) calcining said dried carrier.
Claim 2
Dependent Claim
76 words
A process for the preparation of a durable, aging-resistant alumina-based catalyst carrier having improved mechanical strength, comprising (i) impregnating an agglomerated alumina-based catalyst carrier with an aqueous solution of a quaternary ammonium silicate of general formula: (SiO.sub.2+x.sup.2x- +2×N.sup.+ R.sub.4) wherein R is a hydrocarbon radical and in which the ratio r, the number of moles of Si/number of moles of N, is less than 15, (ii) drying said impregnated carrier, and (iii) calcining said dried carrier.
Claim 3
Dependent Claim
14 words
The process as defined by claim 1, said catalyst carrier impregnated comprising alumina particulates.
Claim 4
Dependent Claim
17 words
The process as defined by claim 2, said alumina particulates comprising spheres, pellets, extrudates or crushed alumina.
Claim 5
Dependent Claim
15 words
The process as defined by claim 3, said catalyst carrier impregnated comprising finely divided alumina.
Claim 6
Dependent Claim
15 words
The process as defined by claim 4, said catalyst carrier impregnated comprising transition alumina agglomerates.
Claim 7
Dependent Claim
19 words
The process as defined by claim 2, wherein said silicate is converted into silica during the calcination step (iii).
Claim 8
Dependent Claim
18 words
The process as defined by claim 6, said quaternary ammonium silicate comprising tetramethylammonium, tetraethylammonium, tetrapropylammonium or tetrahydroxyethylammonium silicate.
Claim 9
Dependent Claim
22 words
The process as defined by claim 6, wherein the final product catalyst carrier comprises from 0.1 to 25% by weight of silica.
Claim 10
Dependent Claim
22 words
The process as defined by claim 8, wherein the final product catalyst carrier comprises from 1 to 5% by weight of silica.
Claim 11
Dependent Claim
16 words
The process as defined by claim 1, said impregnating step (i) being on a dry basis.
Claim 12
Dependent Claim
16 words
The process as defined by claim 1, wherein said ratio r ranges from 0.1 to 1.5.
Claim 13
Dependent Claim
33 words
The process as defined by claim 1, further comprising introducing into said catalyst carrier, prior to the drying (ii) thereof, at least one precursor of a rare earth, alkaline earth and/or zirconium oxide.
Claim 14
Dependent Claim
22 words
The defined by claim 12, said least one precursor being thermally decomposed into respective oxide form thereof during said calcination step (iii).
Claim 15
Dependent Claim
25 words
The process as defined by claim 13, said at least one oxide form comprising up to 20% by weight of the final product catalyst carrier.
Claim 16
Dependent Claim
26 words
The process as defined by claim 14, said at least one oxide form comprising from 1 to 10% by weight of the final product catalyst carrier.
Claim 17
Dependent Claim
26 words
The process as defined by claim 14, said at least one oxide form comprising from 2 to 5% by weight of the final product catalyst carrier.
Claim 18
Dependent Claim
23 words
The process as defined by claim 1, comprising carrying out said drying step (ii) at a temperature of from 80° to 500° C.
Claim 19
Dependent Claim
29 words
The process as defined by claim 17, comprising carrying out said calcining step (iii) at a temperature of from 500° to 1,000° C. for from 1 to 24 hours.
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |