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US4863889A
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High surface area rhenium sulfide hydrodesulfurization catalysts prepared by an aqueous technique and a process for using them
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1988-12-20
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Granted: 1989-09-05
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Expires: 2008-12-20
Abstract
Abstract This invention relates to a process for the preparation of high surface area rhenium sulfide hydrodesulfurization catalysts and to a process of using such catalysts for hydrotreating, particularly hydrodesulfurizing heavy hydrocarbons. The catalyst may be supported during use. They are preferably made using an aqueous procedure for forming the solid ReS2+s precursor. The precursor is then heated for a period of time in substantially pure H2S.
Inventors
- 👤 June D. Passaretti-Miscia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:00
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/02; B01J27/04; B01J37/00; B01J37/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
A process for preparing a hydrotreating catalyst comprising (a) forming an aqueous solution of a rhenium containing compound; (b) treating the aqueous solution with an acidic buffered solution to obtain a pH of about 4.0 to about 4.5; (c) purging the buffered solution with H 2 S and heating the resulting solution to form a precipitate; (d) recovering the precipitate and treating the precipitate with H 2 S at a temperature ranging from about 425° to 725° C. to form the catalyst.
Claim 2
Dependent Claim
82 words
A process for preparing a hydrotreating catalyst comprising (a) forming an aqueous solution of a rhenium containing compound; (b) treating the aqueous solution with an acidic buffered solution to obtain a pH of about 4.0 to about 4.5; (c) purging the buffered solution with H 2 S and heating the resulting solution to form a precipitate; (d) recovering the precipitate and treating the precipitate with H 2 S at a temperature ranging from about 425° to 725° C. to form the catalyst.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the resulting catalyst has a surface of at least 40 m 2 /gm and is amorphous to X-ray.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the rhenium compound of (a) is (NH 4 )ReO 4 or Re 2 O 7 .
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the acidic buffered solution of (b) comprises acetic acid and NaOH.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the catalyst is combined with a support.
Claim 7
Dependent Claim
27 words
The process of claim 5 wherein the support is selected from the group consisting of an acidic or mixed metal oxide, a transition metal sulfide, and carbon.
Claim 8
Dependent Claim
10 words
The process of claim 5 wherein the support comprises alumina.
Claim 9
Dependent Claim
11 words
The process of claim 5 wherein the support comprises molybdenum sulfide.
Claim 10
Dependent Claim
11 words
The process of claim 5 wherein the support comprises activated carbon.
Claim 11
Dependent Claim
11 words
The process of claim 5 wherein the support comprises graphitic carbon.
Claim 12
Dependent Claim
104 words
A process for preparing a hydrotreating catalyst having a surface area of at least 40 in 2 /gm and amphorous to X-ray comprising (a) forming an aqueous solution of NH 4 ReO 4 or Re 2 O 7 , (b) treating the aqueous solution with an acidic buffered solution to obtain a pH of about 4.0 to about 4.5, (c) purging the buffered solution with a H 2 S containing stream and heating the solution to form a precipitate, (d) recovering the precipitate and treating the precipitate with H 2 S at a temperature of about 425° to 725° C. for about 1-4 hours.
Claim 13
Dependent Claim
104 words
A process for preparing a hydrotreating catalyst having a surface area of at least 40 in 2 /gm and amphorous to X-ray comprising (a) forming an aqueous solution of NH 4 ReO 4 or Re 2 O 7 , (b) treating the aqueous solution with an acidic buffered solution to obtain a pH of about 4.0 to about 4.5, (c) purging the buffered solution with a H 2 S containing stream and heating the solution to form a precipitate, (d) recovering the precipitate and treating the precipitate with H 2 S at a temperature of about 425° to 725° C. for about 1-4 hours.
Claim 14
Dependent Claim
21 words
The process of claim 11 wherein the hydrogen sulfide containing stream of (c) consists essentially of hydrogen sulfide and inert gas.
Claim 15
Dependent Claim
13 words
The process of claim 11 wherein the catalyst is combined with a support.
Claim 16
Dependent Claim
10 words
The process of claim 13 wherein the support comprises alumina.
Claim 17
Dependent Claim
11 words
The process of claim 13 wherein the support comprises molybdenum sulfide.
Claim 18
Dependent Claim
14 words
The process of claim 13 wherein the support comprises activated carbon or graphite carbon.
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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |