Claims
- 1. A method for the oxidation of exhaust comprising oxygen and products of combustion in a spark ignition internal combustion engine of fuel containing a lead moiety and a lead scavenger, said method comprising passing the exhaust gas through a catalyst consisting essentially of a mixture of one or more platinum group metals, at least some of which is platinum, and WO.sub.3, TiO.sub.2 or NiMoO.sub.4 deposited upon a substrate in the form of a monolithic cellular structure made from ceramic or metallic material coated with alumina.
- 2. A method according to claim 1, wherein the substrate is a monolithic structure made from a ceramic material coated with alumina.
- 3. A method according to claim 2, wherein the ceramic material is zircon-mullite, mullite, alumina stillimanite, magnesium silicate, kaolin clay, zircon, petalite, spodumene, cordierite or alumina silicate.
- 4. A method according to claim 1, wherein the substrate is a monolithic structure made from a metallic material coated with alumina.
- 5. A method according to claim 4, wherein the metallic material is an oxidation-resistant metal or alloy.
- 6. A method according to claim 1, wherein the loading of the alumina is in the range 0.5-20 g in.sup.-3.
- 7. A method according to claim 1, wherein the loading of the alumina is in the range 2-6 g in.sup.-3.
- 8. A method according to claim 1, wherein the loading of the alumina is in the range 4-6 g in.sup.-3.
- 9. A method according to claim 1, wherein the loading of the base metal is in the range 50-2000 g ft.sup.-3.
- 10. A method according to claim 1, wherein the loading of the base metal is 400 g ft.sup.-3.
- 11. A method according to claim 9, wherein the loading of the platinum group metal or metals is in the range 10-150 g ft.sup.-3.
- 12. A method according to claim 1, wherein the loading of the platinum group metal or metals is 40 g ft.sup.-3.
- 13. A method for the oxidation of exhaust comprising oxygen and products of combustion in a spark ignition internal combustion engine of fuel containing a lead moiety and a lead scavenger without using direct ignition, said method comprising passing the exhaust gas through a catalyst consisting essentially of a mixture of one or more platinum group metals, at least some of which is platinum itself, and NIMoO.sub.4 deposted upon a substrate in the form of a monolithic cellular structure made from ceramic or metallic material coated with alumina.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8008068 |
Mar 1980 |
GBX |
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Parent Case Info
This is a continuation of application Ser. No. 240,235 filed Mar. 3, 1981.
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
972683 |
Oct 1964 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
240235 |
Mar 1981 |
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