US4127510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for the purification of an exhaust gas
Assignee: Johnson Matthey PLC
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Filing: 1976-10-26
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Granted: 1978-11-28
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Expires: 1996-10-26
Abstract
Abstract This invention relates to catalysts suitable for the purification of exhaust gases. In particular a catalyst according to the invention comprises a compound selected from the group represented by the general formula A x M y O z in which A is one or more metals selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba, Al, Sc, Y, the lanthanides, Ti, Zr, V, Cr, Mn, Fe, Co, Ni, Cu, Zn; M is a metal selected from the group consisting of Ir, Rh, Pt, Pd, and Ru; y has an integral or fractional value within the range from 0.1 to 3.0, z is an integer with a value from 2 to 7 and x has a value such that the compound is electrically neutral.
Inventors
- 👤 Brian Harrison
- 👤 Alan F. Diwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:45
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/54; B01J23/56; B01J23/70; B01J23/89; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A catalyst for the purification of an exhaust gas which includes the simultaneous reduction of a nitrogen oxide and the oxidation of carbon monoxide and unreacted hydrocarbon, said catalyst comprising an inert refractory ceramic honeycomb support, an intermediate refractory metal oxide layer on the support to provide a high surface area and a catalytic material deposited on said intermediate refractory metal oxide layer, said material comprising a compound selected from the group consisting of LaRhO 3 , MgRh 2 O 4 , Ba 4 PtO 6 , CoAlRhO 4 , CaPd 3 O 4 and LaNa 0 .5 Ir 0 .5 O 3 .
Claim 2
Dependent Claim
104 words
A catalyst for the purification of an exhaust gas which includes the simultaneous reduction of a nitrogen oxide and the oxidation of carbon monoxide and unreacted hydrocarbon, said catalyst comprising an inert refractory ceramic honeycomb support, an intermediate refractory metal oxide layer on the support to provide a high surface area and a catalytic material deposited on said intermediate refractory metal oxide layer, said material comprising a compound selected from the group consisting of LaRhO 3 , MgRh 2 O 4 , Ba 4 PtO 6 , CoAlRhO 4 , CaPd 3 O 4 and LaNa 0 .5 Ir 0 .5 O 3 .
Claim 3
Dependent Claim
17 words
The catalyst of claim 1 wherein a platinum group metal is also included in the catalytic material.
Claim 4
Dependent Claim
103 words
A catalyst for the purification of an exhaust gas which includes the simultaneous reduction of a nitrogen oxide and the oxidation of carbon monoxide and unreacted hyrdocarbon, said catalyst comprising an inert metallic honeycomb support, an intermediate refractory metal oxide layer on the support to provide a high surface area and a catalytic material deposited on said intermediate refractory metal oxide layer, said material comprising a compound selected from the group consisting of LaRhO 3 , MgRh 2 O 4 , Ba 4 PtO 6 , CoAlRhO 4 , CaPd 3 O 4 and LaNa 0 .5 Ir 0 .5 O 3 .
Claim 5
Dependent Claim
103 words
A catalyst for the purification of an exhaust gas which includes the simultaneous reduction of a nitrogen oxide and the oxidation of carbon monoxide and unreacted hyrdocarbon, said catalyst comprising an inert metallic honeycomb support, an intermediate refractory metal oxide layer on the support to provide a high surface area and a catalytic material deposited on said intermediate refractory metal oxide layer, said material comprising a compound selected from the group consisting of LaRhO 3 , MgRh 2 O 4 , Ba 4 PtO 6 , CoAlRhO 4 , CaPd 3 O 4 and LaNa 0 .5 Ir 0 .5 O 3 .
References Cited (Backward Citations)
US3711397A
Cited
US3773894A
Cited
US3905918A
Cited
US3907968A
Cited
US3972837A
Cited
US3897367A
Cited
US4001143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |