US3922235A
Expired / Lapsed
US
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Stabilized ruthenium catalysts for selective reduction of oxides of nitrogen
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1974-07-31
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Granted: 1975-11-25
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Expires: 1994-07-31
Abstract
Abstract A NOx reduction catalyst is described. The catalyst consists of ruthenium interacting with a support of either zirconium titanate, titania or mixtures thereof. The new catalyst results in a stabilized ruthenium catalyst that is resistant to both ruthenium volatilization loss and ruthenium sintering.
Inventors
- 👤 John P Deluca
- 👤 Lawrence L Murrell
- 👤 Richard P Rhodes
- 👤 Samuel J Tauster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:27
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/462; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9422; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1026; B01D2255/20; B01D2255/207; B01D2255/20707; B01D2255/20715; B01D2255/90; B01D2255/92; B01D2255/9207
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A STABILIZED SUPPORTED RUTHENIUM CATALYST, SAID CATALYST COMPRISNG RUTHENIUM METAL IN COMBINATION WITH AN OXIDE SUPPORT, SAID SUPPORT BEING ONE SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM TITANATE, AND ZIRCONIUM TITATES MIXED WITH TITANIA, THE RUTHENIUM BEING PRESENT IN AN AMOUNT WHICH DOES NOT EXCEED 0.003 GRAMS OF RUTHENIUM PER GRAM OF OXIDE SUPPORT.
Claim 2
Dependent Claim
54 words
A STABILIZED SUPPORTED RUTHENIUM CATALYST, SAID CATALYST COMPRISNG RUTHENIUM METAL IN COMBINATION WITH AN OXIDE SUPPORT, SAID SUPPORT BEING ONE SELECTED FROM THE GROUP CONSISTING OF ZIRCONIUM TITANATE, AND ZIRCONIUM TITATES MIXED WITH TITANIA, THE RUTHENIUM BEING PRESENT IN AN AMOUNT WHICH DOES NOT EXCEED 0.003 GRAMS OF RUTHENIUM PER GRAM OF OXIDE SUPPORT.
Claim 3
Dependent Claim
28 words
A catalyst according to claim 1 wherein the ruthenium is present in an amount ranging from 0.00005 to 0.001 grams of ruthenium per gram of interacting oxide support.
Claim 4
Dependent Claim
12 words
A catalyst according to claim 1 wherein the support is zirconium titanate.
Claim 5
Dependent Claim
27 words
A catalyst according to claim 1 wherein the support is a mixture of zirconium titanate and titania in any molar ratio between the titania and zirconium titanate.
Claim 6
Independent Claim
100 words
A method for forming a stabilized supported ruthenium catalyst, said method comprising the steps of contacting a support, said support being one selected from the group consisting of zirconium titanate and zirconium titanate mixed with titania with an aqueous solution of a ruthenium salt present in an amount to deposit upon the support an amount of metal no greater than .003 grams of ruthenium per gram of support under ambient temperature and pressure conditions, drying the catalyst, then reducing the catalyst in a hydrogen atmosphere at 1000*F. and calcining the catalyst in air at a temperature of at least 1550*F.
Claim 7
Independent Claim
100 words
A method for forming a stabilized supported ruthenium catalyst, said method comprising the steps of contacting a support, said support being one selected from the group consisting of zirconium titanate and zirconium titanate mixed with titania with an aqueous solution of a ruthenium salt present in an amount to deposit upon the support an amount of metal no greater than .003 grams of ruthenium per gram of support under ambient temperature and pressure conditions, drying the catalyst, then reducing the catalyst in a hydrogen atmosphere at 1000*F. and calcining the catalyst in air at a temperature of at least 1550*F.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |