US4759918A
Expired / Lapsed
US
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Process for the reduction of the ignition temperature of diesel soot
Assignee: Honeywell International Inc
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Filing: 1987-04-16
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Granted: 1988-07-26
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Expires: 2007-04-16
Abstract
Abstract This invention relates to a process for reducing the ignition temperature of diesel soot. The process comprises contacting a hot exhaust from a diesel engine, which exhaust contains diesel soot, with a catalytic composite. The composite comprises a particulate filter coated with a sulfur resistant refractory inorganic oxide selected from the group consisting of titania, zirconia, silica, silica-alumina and alumina which has been treated to be sulfur resistant, i.e. alumina treated with titania, zirconia, tungsten oxide, etc. This coated ceramic trap has deposited thereon at least one catalytic element or compound selected from the group consisting of Pt, Pd, and Rh.
Inventors
- 👤 Edwin H. Homeier
- 👤 George C. Joy, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/40; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/0231; F01N3/033; F01N3/035; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2882; F01N2250/00; F01N2250/02; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
80 words
A process for reducing the ignition temperature of diesel soot in an exhaust gas from an internal combustion diesel engine comprising contacting said exhaust with a catalytical composite consisting essentially of a particulate filter having deposited thereon at least one sulfur resistant refractory inorganic oxide selected from the group consisting of titania, zirconia, alumina treated with titania, and alumina treated with zirconia, having deposited thereon at least one catalytic metal selected from the group consisting of Pt, Pd and Rh.
Claim 2
Dependent Claim
80 words
A process for reducing the ignition temperature of diesel soot in an exhaust gas from an internal combustion diesel engine comprising contacting said exhaust with a catalytical composite consisting essentially of a particulate filter having deposited thereon at least one sulfur resistant refractory inorganic oxide selected from the group consisting of titania, zirconia, alumina treated with titania, and alumina treated with zirconia, having deposited thereon at least one catalytic metal selected from the group consisting of Pt, Pd and Rh.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said exhaust comprises carbon monoxide, hydrocarbons, nitrogen oxides, particulate soot, and sulfur oxides.
Claim 4
Dependent Claim
13 words
The process of claim 1 where said particulate filter is a ceramic foam.
Claim 5
Dependent Claim
17 words
The process of claim 1 where said particulate filter is a monolithic honeycomb ceramic wall flow filter.
Claim 6
Dependent Claim
16 words
The process of claim 1 where said particulate filter is a metallic mesh or ribbon filter.
Claim 7
Dependent Claim
11 words
The process of claim 1 where said refractory oxide is titania.
Claim 8
Dependent Claim
11 words
The process of claim 1 where said refractory oxide is zirconia.
Claim 9
Dependent Claim
11 words
The process of claim 1 where said catalytic element is platinum.
Claim 10
Dependent Claim
30 words
The process of claim 8 where said platinum is present in a concentration from about 5 to about 250 g of platinum per cubic foot of volume of particulate filter.
Claim 11
Dependent Claim
11 words
The process of claim 1 where said catalytic element is palladium.
Claim 12
Dependent Claim
30 words
The process of claim 10 where said palladium is present in a concentration from about 5 to about 250 g of palladium per cubic foot of volume of particulate filter.
Claim 13
Dependent Claim
11 words
The process of claim 1 where said catalytic element is rhodium.
Claim 14
Dependent Claim
30 words
The process of claim 12 where said rhodium is present in a concentration from about 2 to about 70 g of rhodium per cubic foot of volume of particulate filter.
Claim 15
Dependent Claim
32 words
The process of claim 1 where said refractory inorganic oxide is present in a concentration from about 0.2 to about 3.5 g of oxide per cubic inch of volume of particulate filter.
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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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |