US4199435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
NOx Control in cracking catalyst regeneration
Assignee: Chevron USA Inc
•
Filing: 1978-12-04
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Granted: 1980-04-22
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Expires: 1998-12-04
Abstract
Abstract The amount of NO x formed during regeneration of a cracking catalyst in the presence of a metallic carbon monoxide combustion catalyst is decreased without substantially adversely affecting the carbon monoxide combustion activity of the promoter by subjecting the combustion-promoting catalyst to steam treatment prior to employing it in the cracking catalyst regeneration operation.
Inventors
- 👤 Donald O. Chessmore
- 👤 Charles E. Rudy, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:52
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A process for cracking hydrocarbons in the absence of externally supplied molecular hydrogen comprising: (1) contacting steam with a carbon monoxide combustion promoter comprising a combustion-promoting metal or compound of a metal selected from platinum, palladium, iridium, osmium, ruthenium, rhodium, rhenium and copper associated with at least one particulate porous inorganic solid at a temperature of 760° C. to 1100° C. and a steam pressure of 1 atmosphere to 15 atmospheres for a period of from 2 hours to 100 hours; (2) cycling particulate cracking catalyst between a cracking zone and a catalyst regeneration zone, in a catalytic cracking system; (3) cracking said hydrocarbons in contact with said catalyst at cracking conditions in said cracking zone whereby coke is formed on said catalyst; and (4) burning coke off said catalyst with an oxygen-containing and nitrogen-containing gas at regeneration conditions in said regeneration zone in the presence of said combustion promoter.
Claim 2
Dependent Claim
150 words
A process for cracking hydrocarbons in the absence of externally supplied molecular hydrogen comprising: (1) contacting steam with a carbon monoxide combustion promoter comprising a combustion-promoting metal or compound of a metal selected from platinum, palladium, iridium, osmium, ruthenium, rhodium, rhenium and copper associated with at least one particulate porous inorganic solid at a temperature of 760° C. to 1100° C. and a steam pressure of 1 atmosphere to 15 atmospheres for a period of from 2 hours to 100 hours; (2) cycling particulate cracking catalyst between a cracking zone and a catalyst regeneration zone, in a catalytic cracking system; (3) cracking said hydrocarbons in contact with said catalyst at cracking conditions in said cracking zone whereby coke is formed on said catalyst; and (4) burning coke off said catalyst with an oxygen-containing and nitrogen-containing gas at regeneration conditions in said regeneration zone in the presence of said combustion promoter.
Claim 3
Dependent Claim
11 words
A method according to claim 1 wherein said metal comprises platinum.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein said particulate porous inorganic solid includes at least one of alumina and silica.
Claim 5
Independent Claim
100 words
A method for restricting the formation of nitrogen oxides in a hydrocarbon cracking catalyst regeneration zone wherein carbon monoxide is combusted with a molecular oxygen-containing and molecular nitrogen-containing gas in contact with a carbon monoxide combustion promoter including a combustion-promoting metal or compound metal selected from platinum, palladium, iridium, osmium, ruthenium, rhodium, rhenium and copper associated with at least one particulate porous inorganic solid, comprising: contacting said combustion promoter with steam at a temperature of 760° C. to 1100° C. and a steam pressure of 1 atmosphere to 15 atmospheres for a period of from 2 hours to 100 hours.
Claim 6
Independent Claim
100 words
A method for restricting the formation of nitrogen oxides in a hydrocarbon cracking catalyst regeneration zone wherein carbon monoxide is combusted with a molecular oxygen-containing and molecular nitrogen-containing gas in contact with a carbon monoxide combustion promoter including a combustion-promoting metal or compound metal selected from platinum, palladium, iridium, osmium, ruthenium, rhodium, rhenium and copper associated with at least one particulate porous inorganic solid, comprising: contacting said combustion promoter with steam at a temperature of 760° C. to 1100° C. and a steam pressure of 1 atmosphere to 15 atmospheres for a period of from 2 hours to 100 hours.
Claim 7
Dependent Claim
11 words
A method according to claim 4 wherein said metal comprises platinum.
Claim 8
Dependent Claim
20 words
A method according to claim 4 wherein said particulate porous inorganic solid includes at least one of alumina and silica.
References Cited (Backward Citations)
US3615166A
Cited
US3806582A
Cited
US4053556A
Cited
US3788977A
Cited
US3808121A
Cited
US4039622A
Cited
US4093535A
Cited
US4148751A
Cited
US4115250A
Cited
US4134860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |