Patent US4539305A successfully refreshed from Google Patents.
US4539305A
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Pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst
Assignee: Chevron USA Inc
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Filing: 1984-03-08
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Granted: 1985-09-03
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Expires: 2004-03-08
Abstract
Abstract A pretreatment method is disclosed for enhancing the selectivity and increasing the stability of a reforming catalyst comprising a large-pore zeolite containing at least one Group VIII metal. In this method, the catalyst is reduced in reducing atmosphere at a temperature of from 250° C. to 650° C., exposed to an oxygen-containing gas, treated in a reducing atmosphere at from 120° C. to 260° C., and maintained at a temperature of from 370° C. to 600° C. in a reducing atmosphere.
Inventors
- 👤 Charles R. Wilson
- 👤 Waldeen C. Buss
- 👤 Leslie A. Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:58
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/10; B01J29/12; B01J29/60; B01J29/61; B01J29/62; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/42
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
93 words
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising a large-pore zeolite containing at least one Group VIII metal, wherein said method comprises: (a) reducing said catalyst in a reducing atmosphere at a temperature of from 250° C. to 650° C.; (b) exposing said reduced catalyst to an oxygen-containing gas; (c) treating said exposed catalyst in a reducing atmosphere at from 120° C. to 260° C.; and (d) maintaining the temperature of the treated catalyst at from 370° C. to 600° C. in a reducing atmosphere.
Claim 2
Dependent Claim
93 words
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising a large-pore zeolite containing at least one Group VIII metal, wherein said method comprises: (a) reducing said catalyst in a reducing atmosphere at a temperature of from 250° C. to 650° C.; (b) exposing said reduced catalyst to an oxygen-containing gas; (c) treating said exposed catalyst in a reducing atmosphere at from 120° C. to 260° C.; and (d) maintaining the temperature of the treated catalyst at from 370° C. to 600° C. in a reducing atmosphere.
Claim 3
Dependent Claim
30 words
A pretreatment method according to claim 1 wherein said reduction temperature in step (a) is from 350° C. to 550° C., and wherein said reducing atmosphere is a hydrogen gas.
Claim 4
Dependent Claim
13 words
A pretreatment method according to claim 1 wherein said oxygen-containing gas is air.
Claim 5
Dependent Claim
25 words
A pretreatment method according to claim 1 wherein said step (c) occurs in the presence of hydrogen at atmospheric pressure for at least twenty minutes.
Claim 6
Dependent Claim
24 words
A pretreatment method according to claim 4 wherein said step (d) occurs in the presence of hydrogen for from ten minutes to 24 hours.
Claim 7
Dependent Claim
16 words
A pretreatment method according to claim 5 wherein said step (d) occurs for about ten minutes.
Claim 8
Dependent Claim
22 words
A pretreatment method according to claim 1 wherein said large-pore zeolite has an apparent pore size of from 7 to 9 Angstroms.
Claim 9
Dependent Claim
26 words
A pretreatment method according to claim 7 wherein said large-pore zeolite is selected from the group consisting of zeolite X, zeolite Y and type L zeolite.
Claim 10
Dependent Claim
16 words
A pretreatment method according to claim 8 wherein said large-pore zeolite is a type L zeolite.
Claim 11
Dependent Claim
14 words
A pretreatment method according to claim 1 wherein said Group VIII metal is platinum.
Claim 12
Dependent Claim
22 words
A pretreatment method according to claim 10 wherein said catalyst comprises: (a) a large-pore zeolite containing platinum; and (b) an inorganic binder.
Claim 13
Dependent Claim
23 words
A pretreatment method according to claim 11 wherein said inorganic binder is selected from the group consisting of silica, alumina, aluminosilicates, and clays.
Claim 14
Dependent Claim
25 words
A pretreatment method according to claim 1 wherein said catalyst contains an alkaline earth metal selected from the group consisting of barium, strontium, and calcium.
Claim 15
Dependent Claim
14 words
A pretreatment method according to claim 13 wherein said alkaline earth metal is barium.
Claim 16
Dependent Claim
26 words
A pretreatment method according to claim 14 wherein said catalyst has from 8% to 10% by weight barium and from 0.1% to 1.5% by weight platinum.
Claim 17
Dependent Claim
126 words
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising: (A) a type L zeolite containing from 0.1% to 1.5% by weight platinum; and (B) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays; wherein said pretreatment method comprises: (a) reducing said catalyst in the presence of hydrogen at a temperature of from 350° C. to 550° C.; and (b) exposing said reduced catalyst to air; (c) treating said exposed catalyst in the presence of hydrogen at atmospheric pressure for at least twenty minutes at from 120° C. to 260° C.; and (d) maintaining the temperature of the treated catalyst at from 370° C. to 600° C. in a reducing atmosphere for about ten minutes.
Claim 18
Dependent Claim
126 words
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising: (A) a type L zeolite containing from 0.1% to 1.5% by weight platinum; and (B) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays; wherein said pretreatment method comprises: (a) reducing said catalyst in the presence of hydrogen at a temperature of from 350° C. to 550° C.; and (b) exposing said reduced catalyst to air; (c) treating said exposed catalyst in the presence of hydrogen at atmospheric pressure for at least twenty minutes at from 120° C. to 260° C.; and (d) maintaining the temperature of the treated catalyst at from 370° C. to 600° C. in a reducing atmosphere for about ten minutes.
Claim 19
Dependent Claim
134 words
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising: (A) a type L zeolite containing from 8% to 10% by weight barium and from 0.1% to 1.5% by weight platinum; and (B) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays; wherein said pretreatment method comprises: (a) reducing said catalyst in the presence of hydrogen at a temperature of from 350° C. to 550° C.; and (b) exposing said reduced catalyst to air; (c) treating said exposed catalyst in the presence of hydrogen at atmospheric pressure for at least twenty minutes at from 120° C. to 260° C.; and (d) maintaining the temperature of the treated catalyst at from 370° C. to 600° C. in a reducing atmosphere for about ten minutes.
Claim 20
Dependent Claim
134 words
A pretreatment method for enhancing the selectivity and increasing the stability of a reforming catalyst comprising: (A) a type L zeolite containing from 8% to 10% by weight barium and from 0.1% to 1.5% by weight platinum; and (B) an inorganic binder selected from the group consisting of silica, alumina, aluminosilicates, and clays; wherein said pretreatment method comprises: (a) reducing said catalyst in the presence of hydrogen at a temperature of from 350° C. to 550° C.; and (b) exposing said reduced catalyst to air; (c) treating said exposed catalyst in the presence of hydrogen at atmospheric pressure for at least twenty minutes at from 120° C. to 260° C.; and (d) maintaining the temperature of the treated catalyst at from 370° C. to 600° C. in a reducing atmosphere for about ten minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |