Patent US4893465A successfully refreshed from Google Patents.
US4893465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process conditions for operation of ignition catalyst for natural gas combustion
Assignee: BASF Catalysts LLC
•
Filing: 1988-08-22
•
Granted: 1990-01-16
•
Expires: 2008-08-22
Abstract
Abstract A method for operating a palladium oxide containing catalytic combustor useful, e.g., for powering a gas turbine. The method involves maintaining control of the temperature within the combustor in such a manner as to insure the presence of palladium oxide. By maintaining the temperature below about 800° C. decomposition of palladium oxide into metallic palladium is avoided and high catalytic activity is retained. Regeneration of catalyst following inactivation resulting from an over-temperature is accomplished by using a heat soak in the temperature range of about 530° C.-650° C.
Inventors
- 👤 Robert J. Farrauto
- 👤 Teresa Kennelly
- 👤 Earl M. Waterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:53
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/24; B01J19/248; B01J19/2485; F; F23; F23C; F23C13/00; F23R; F23R3/00; F23R3/40; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00058; B01J2219/00063; B01J2219/00191; B01J2219/00193; B01J2219/00195; B01J2219/002; B01J2219/00222; B01J2219/00227; B01J2219/00229; B01J2219/00231
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
143 words
A process for starting a combustion system to catalytically combust carbonaceous fuels with air in a combustor in the presence of a palladium oxide containing catalyst, which comprises utilizing a flow of hot gases from a preburner to heat said catalyst to a first temperature in excess of the decomposition temperature of the catalyst, said decomposition temperature at atmospheric pressure being at least about 800° C., and thereafter reducing the flow of hot gases from the preburner while supplying air and fuel for combustion to the combustor downstream of said preheater, and thereafter restoring catalytic activity by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 530° C. to about 650° C. and maintaining the temperature within that range until desired catalytic activity is achieved and thereafter maintaining the catalyst below about 800° C.
Claim 2
Dependent Claim
143 words
A process for starting a combustion system to catalytically combust carbonaceous fuels with air in a combustor in the presence of a palladium oxide containing catalyst, which comprises utilizing a flow of hot gases from a preburner to heat said catalyst to a first temperature in excess of the decomposition temperature of the catalyst, said decomposition temperature at atmospheric pressure being at least about 800° C., and thereafter reducing the flow of hot gases from the preburner while supplying air and fuel for combustion to the combustor downstream of said preheater, and thereafter restoring catalytic activity by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 530° C. to about 650° C. and maintaining the temperature within that range until desired catalytic activity is achieved and thereafter maintaining the catalyst below about 800° C.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the carbonaceous material is natural gas.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the carbonaceous material is methane.
Claim 5
Dependent Claim
36 words
The process of claim 1 wherein restored catalytic activity is achieved by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 560° C. to about 650° C.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the palladium oxide containing catalyst is supported on a modified aluminum oxide carrier.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein combustion effluent is employed to run a gas turbine.
Claim 8
Dependent Claim
130 words
A process for starting a combustion system to catalytically combust carbonaceous fuels with air in a combustor in the presence of a palladium oxide containing catalyst, which comprises utilizing a flow of hot gases from a preburner to heat said catalyst to a first temperature in excess of at least about 700° C., and thereafter reducing the flow of hot gases from the preburner while supplying air and fuel for combustion to the combustor downstream of said preheater, and thereafter restoring catalytic activity by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 530° C. to about 650° C. and maintaining the temperature within that range until desired catalytic activity is achieved and thereafter maintaining the catalyst below about 800° C.
Claim 9
Dependent Claim
130 words
A process for starting a combustion system to catalytically combust carbonaceous fuels with air in a combustor in the presence of a palladium oxide containing catalyst, which comprises utilizing a flow of hot gases from a preburner to heat said catalyst to a first temperature in excess of at least about 700° C., and thereafter reducing the flow of hot gases from the preburner while supplying air and fuel for combustion to the combustor downstream of said preheater, and thereafter restoring catalytic activity by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 530° C. to about 650° C. and maintaining the temperature within that range until desired catalytic activity is achieved and thereafter maintaining the catalyst below about 800° C.
Claim 10
Dependent Claim
12 words
The process of claim 7 wherein the carbonaceous material is natural gas.
Claim 11
Dependent Claim
11 words
The process of claim 7 wherein the carbonaceous material is methane.
Claim 12
Dependent Claim
36 words
The process of claim 7 wherein restored catalytic activity is achieved by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 560° C. to about 650° C.
Claim 13
Dependent Claim
19 words
The process of claim 7 wherein the palladium oxide containing catalyst is supported on a modified aluminum oxide carrier.
Claim 14
Dependent Claim
15 words
The process of claim 7 wherein combustion effluent is employed to run a gas turbine.
Claim 15
Dependent Claim
90 words
In a process for catalytic combustion of carbonaceous materials using a palladium oxide containing catalyst, wherein the catalyst for said catalytic combustion reaction is subjected to temperatures in excess of the decomposition temperature of the catalyst which at atmospheric pressure is at least about 800° C., the improvement comprising restoring catalytic activity by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 530° C. to about 650° C. and maintaining the temperature within that range until desired catalytic activity is achieved.
Claim 16
Dependent Claim
90 words
In a process for catalytic combustion of carbonaceous materials using a palladium oxide containing catalyst, wherein the catalyst for said catalytic combustion reaction is subjected to temperatures in excess of the decomposition temperature of the catalyst which at atmospheric pressure is at least about 800° C., the improvement comprising restoring catalytic activity by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 530° C. to about 650° C. and maintaining the temperature within that range until desired catalytic activity is achieved.
Claim 17
Dependent Claim
12 words
The process of claim 13 wherein the carbonaceous material is natural gas.
Claim 18
Dependent Claim
11 words
The process of claim 13 wherein the carbonaceous material is methane.
Claim 19
Dependent Claim
36 words
The process of claim 14 wherein restored catalytic activity is achieved by lowering the temperature of the catalyst into a regenerating temperature range which at atmospheric pressure is from about 560° C. to about 650° C.
Claim 20
Dependent Claim
19 words
The process of claim 13 wherein the palladium oxide containing catalyst is supported on a modified aluminum oxide carrier.
Claim 21
Dependent Claim
15 words
The process of claim 13 wherein combustion effluent is employed to run a gas turbine.
Claim 22
Dependent Claim
18 words
The process of claim 13 wherein the temperature in excess of the decomposition temperature is reached during startup.
References Cited (Backward Citations)
US2941954A
Cited
US3384656A
Cited
US3357915A
Cited
US3919120A
Cited
US3873472A
Cited
US3926842A
Cited
US3987080A
Cited
US4112675A
Cited
US4202168A
Cited
US4534165A
Cited
US4425255A
Cited
JPS5923034A
Cited
US4795845A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |