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US4868148A Expired / Lapsed US ⏱️ 0.0 years remaining

Layered automotive catalytic composite

Assignee: Umicore Autocat USA Inc
•
Filing: 1988-06-01
•
Granted: 1989-09-19
•
Expires: 2008-06-01
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Abstract

Abstract This invention relates to a catalytic composite for treating an exhaust gas comprising a first support which is refractory inorganic oxide having dispersed thereon at least one noble metal component and having dispersed immediately thereon an overlayer comprising at least one oxygen storage component and optionally a second support which is a refractory inorganic oxide. The first support may be selected from the group consisting of alumina, silica, titania, zirconia and aluminosilicates with alumina being preferred. Additionally, the noble metal component may be selected from the group consisting of platinum, palladium, rhodium, ruthenium and iridium. The oxygen storage component is an oxide of a metal which includes cerium, iron, nickel, cobalt lanthanum, neodymium, praesodymium, etc. and mixtures thereof. Cerium oxide is a preferred oxygen storage component. Finally, the second support may be selected from the group consisting of alumina, silica, titania, zirconia and aluminosilicates, with alumina preferred. This invention also relates to a process for minimizing the content of hydrogen sulfide in an automotive exhaust gas which comprises contacting said exhaust gas with a catalyst composite comprising a first support which is a refractory inorganic oxide having dispersed thereon at least one noble metal component and having dispersed immediately thereon an overlayer comprising at least one oxygen storage component and optionally a second support which is refractory inorganic oxide.

Inventors

  • 👤 Michael G. Henk
  • 👤 II Jack C. Summers

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 15:46
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/38; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01J23/70; B01J23/89; B01J37/00; B01J37/02; B01J37/024; B01D2255/00; B01D2255/90; B01D2255/908; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12

Claims Analysis

Total Claims: 17
Claim 1
Independent Claim 123 words
A catalytic composite for treating an exhaust gas and minimizing the hydrogen sulfide content thereof, said catalytic composite comprising a first support which is a refractory inorganic oxide selected from the group consisting of alumina, silica, titania, zirconia, aluminosilicates and mixtures thereof, having dispersed thereon at least one noble metal component selected from the group consisting of platinum, palladium, rhodium, ruthenium, and iridium substantially in the absence of an oxygen storage component and having dispersed immediately thereon an overlayer separated from said noble metal component comprising at least one oxygen storage component which is an oxide of a metal selected from the group consisting of iron, nickel, cobalt and the rare earths and optionally a second support which is a refractory inorganic oxide.
Claim 2
Dependent Claim 123 words
A catalytic composite for treating an exhaust gas and minimizing the hydrogen sulfide content thereof, said catalytic composite comprising a first support which is a refractory inorganic oxide selected from the group consisting of alumina, silica, titania, zirconia, aluminosilicates and mixtures thereof, having dispersed thereon at least one noble metal component selected from the group consisting of platinum, palladium, rhodium, ruthenium, and iridium substantially in the absence of an oxygen storage component and having dispersed immediately thereon an overlayer separated from said noble metal component comprising at least one oxygen storage component which is an oxide of a metal selected from the group consisting of iron, nickel, cobalt and the rare earths and optionally a second support which is a refractory inorganic oxide.
Claim 3
Dependent Claim 16 words
The catalytic composite of claim 1 where said first support is in the shape of pellets.
Claim 4
Dependent Claim 21 words
The catalytic composite of claim 1 where said first support is deposited on a solid ceramic or metallic honeycomb monolithic carrier.
Claim 5
Dependent Claim 12 words
The catalytic composite of claim 1 where said first support is alumina.
Claim 6
Dependent Claim 54 words
The catalytic composite of claim 1 where the noble metal component is platinum, palladium or a mixture thereof, each metal present in a concentration in the range of about 0.01 to 4 weight percent of said first support and optionally rhodium in a concentration of 0.01 to 2 weight percennt of said first support.
Claim 7
Dependent Claim 16 words
The catalytic composite of claim 5 where the metals are a mixture of platinum and rhodium.
Claim 8
Dependent Claim 16 words
The catalytic composite of claim 5 where the metals are a mixture of palladium and rhodium.
Claim 9
Dependent Claim 17 words
The catalytic composite of claim 5 where the metals are a mixture of platinum, palladium and rhodium.
Claim 10
Dependent Claim 31 words
The catalytic composite of claim 1 where said oxygen storage component in said overlayer is present in a concentration of about 2 to about 75 weight percent of said first support.
Claim 11
Dependent Claim 24 words
The catalytic composite of claim 1 where said second support is present in a concentration of 0 to 80 weight percent of sid overlayer.
Claim 12
Dependent Claim 16 words
The catalytic composite of claim 1 where said oxygen storage component is a rare earth oxide.
Claim 13
Dependent Claim 14 words
The catalytic composite of claim 11 where said oxygen storage component is lanthanum oxide.
Claim 14
Dependent Claim 14 words
The catalytic composite of claim 11 where said oxygen storage component is cerium oxide.
Claim 15
Dependent Claim 20 words
The catalytic composite of claim 11 where said oxygen storage component consists of a mixture of lanthanum and cerium oxides.
Claim 16
Dependent Claim 23 words
The catalytic composite of claim 1 where said second support is selected from the group consisting of alumina, silica, titania, zirconia and aluminosilicates.
Claim 17
Dependent Claim 12 words
The catalytic composite of claim 15 where said second support is alumina.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-09-18 1993-03-20 1993-09-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-09-18 1997-03-20 1997-09-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-09-18 2001-03-20 2001-09-19 $7700.00 Window Closed / Lapsed

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