US4089810A
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Catalyst
Assignee: Johnson Matthey PLC
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Filing: 1976-06-28
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Granted: 1978-05-16
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Expires: 1996-06-28
Abstract
Abstract This invention relates to catalyst for use in the control of atmospheric pollution and, in particular to the purification of exhaust gases from internal combustion engines. Specific catalysts of the present invention comprise: (a) ruthenium or an alloy thereof and a metal oxide capable of forming a stable mixed oxide (or "ruthenite") with ruthenium dioxide; (b) a compound formed by ruthenium dioxide and a metal oxide capable of forming a stable mixed oxide (or "ruthenite") with ruthenium dioxide; and (c) a mixed oxide containing ruthenium, the oxide being selected from the group consisting of oxides of the pyrochlore type A 2 B 2 O 7 , the perovskite type ABO 3 , the ilmenite type B 2 O 3 and the spinel type AB 2 O 4 . Particularly good results have been obtained where the platinum/ruthenium ratio is within the range 25 - 95 wt.% platinum and 5 - 75 wt.% ruthenium.
Inventors
- 👤 Alan Francis Diwell
- 👤 William David James Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:22
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J23/002; B01J23/40; B01J23/46; B01J23/462; B01J23/48; B01J23/58; B01J37/00; B01J37/02; B01J37/024; B01J37/0244; B01J2523/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S502/00; Y10S502/524; Y10S502/525
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A catalyst comprising an inert unitary porous ceramic honeycomb having a layer of a first coating of a high surface area catalytically active refractory metal oxide and a second layer deposited upon said first layer, said second layer comprising a catalytically active mixed oxide containing ruthenium selected from the group consisting of oxides of the pyrochlore type A 2 B 2 O 7 , the perovskite type ABO 3 , the ilmenite type B 2 O 3 , and the spinel type AB 2 O 4 , wherein A represents one or more of the cations derived from the group consisting of Na, K, Ca, Sr, Ba, Ag, Cd, Hg, Pb, Bi, Y and rare earths; B represents Ru 4+ and at least one other platinum group metal cation.
Claim 2
Dependent Claim
129 words
A catalyst comprising an inert unitary porous ceramic honeycomb having a layer of a first coating of a high surface area catalytically active refractory metal oxide and a second layer deposited upon said first layer, said second layer comprising a catalytically active mixed oxide containing ruthenium selected from the group consisting of oxides of the pyrochlore type A 2 B 2 O 7 , the perovskite type ABO 3 , the ilmenite type B 2 O 3 , and the spinel type AB 2 O 4 , wherein A represents one or more of the cations derived from the group consisting of Na, K, Ca, Sr, Ba, Ag, Cd, Hg, Pb, Bi, Y and rare earths; B represents Ru 4+ and at least one other platinum group metal cation.
Claim 3
Dependent Claim
152 words
A catalyst comprising an inert unitary porous ceramic honeycomb having a layer of a first coating of a high surface area catalytically active refractory metal oxide and a second layer deposited upon said first layer, said second layer comprising a catalytically active mixed oxide containing ruthenium selected from the group consisting of oxides of the pyrochlore type A 2 B 2 O 7 , the perovskite type ABO 3 , the ilmenite type B 2 O 3 , and the spinel type AB 2 O 4 , wherein A represents one or more of the cations derived from the grup consisting of Na, K, Ca, Sr, Ba, Ag, Cd, Hg, Pb, Bi, Y and rare earths; B represents Ru 4+ and at least one other cation from the group consisting of: Li, Mg, Cr, Nb, Pd, As, Au, Ga, In, Ln, Rh, Sh, Sc, Ir, Os, Pt, Re, Ta, Fe and Co.
Claim 4
Dependent Claim
152 words
A catalyst comprising an inert unitary porous ceramic honeycomb having a layer of a first coating of a high surface area catalytically active refractory metal oxide and a second layer deposited upon said first layer, said second layer comprising a catalytically active mixed oxide containing ruthenium selected from the group consisting of oxides of the pyrochlore type A 2 B 2 O 7 , the perovskite type ABO 3 , the ilmenite type B 2 O 3 , and the spinel type AB 2 O 4 , wherein A represents one or more of the cations derived from the grup consisting of Na, K, Ca, Sr, Ba, Ag, Cd, Hg, Pb, Bi, Y and rare earths; B represents Ru 4+ and at least one other cation from the group consisting of: Li, Mg, Cr, Nb, Pd, As, Au, Ga, In, Ln, Rh, Sh, Sc, Ir, Os, Pt, Re, Ta, Fe and Co.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |