US3898181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Layered rhodium and nickel
Assignee: Monsanto Co
•
Filing: 1973-06-08
•
Granted: 1975-08-05
•
Expires: 1993-06-08
Abstract
Abstract The invention concerns a catalyst in which a nickel component is deposited on an inert support, followed by an alumina coating and a rhodium component. The catalyst is particularly useful for removing nitrogen oxides from automotive exhaust.
Inventors
- 👤 George E Barker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:44
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/892; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01J37/00; B01J37/02; B01J37/024; B01J37/0244; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1025; B01D2255/20; B01D2255/207; B01D2255/20753; B01D2255/209; B01D2255/2092
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
46 words
A CATALYST COMPRISING NICKEL DISPOSED ON AN INERT SUPPORT AND IN ALUMINA COATING THEREOVER UPON WHICH COATING AN AMOUNT OF RHODIUM NO GREATER THAN 0.1 WEIGHT PART PER 100 WEIGHT PARTS INERT SUPPORT IS DISPERSED WITH THE NICKEL AND RHODIUM BEING OXIDES OR IN ELEMENTAL FORM.
Claim 2
Dependent Claim
46 words
A CATALYST COMPRISING NICKEL DISPOSED ON AN INERT SUPPORT AND IN ALUMINA COATING THEREOVER UPON WHICH COATING AN AMOUNT OF RHODIUM NO GREATER THAN 0.1 WEIGHT PART PER 100 WEIGHT PARTS INERT SUPPORT IS DISPERSED WITH THE NICKEL AND RHODIUM BEING OXIDES OR IN ELEMENTAL FORM.
Claim 3
Dependent Claim
23 words
The catalyst of claim 1 in which the amount of rhodium is less than 0.01 weight parts per 100 weight parts inert support.
Claim 4
Dependent Claim
42 words
The catalyst of claim 1 in which the amount of nickel is in the range of 0.5 to 50 weight parts and the amount of alumina in the range of 0.1 to 20 weight parts, each per 100 weight parts inert support.
Claim 5
Dependent Claim
17 words
The catalyst of claim 3 in which the amount of rhodium is 0.0005 to 0.05 weight parts.
Claim 6
Dependent Claim
33 words
The catalyst of claim 1 in which there are at least 5 weight parts nickel, 2 to 6 weight parts alumina, and the amount of nickel is at least twice that of alumina.
Claim 7
Dependent Claim
12 words
The catalyst of claim 1 in which the support is a monolith.
Claim 8
Dependent Claim
13 words
The cataLyst of claim 1 in which the support is a cordierite monolith.
Claim 9
Dependent Claim
23 words
The catalyst of claim 1 in which nickel is deposited on a monolith, followed by an alumina coating, and then rhodium is deposited.
Claim 10
Dependent Claim
50 words
A catalyst comprising nickel fixed on an inert support and alumina deposited as a coating over the nickel with rhodium dispersed upon the alumina in an amount of 0.0005 to 0.05 weight parts per 100 weight parts inert support, with the nickel and rhodium being oxides or in elemental form.
Claim 11
Dependent Claim
50 words
A catalyst comprising nickel fixed on an inert support and alumina deposited as a coating over the nickel with rhodium dispersed upon the alumina in an amount of 0.0005 to 0.05 weight parts per 100 weight parts inert support, with the nickel and rhodium being oxides or in elemental form.
Claim 12
Independent Claim
49 words
The method of preparing a catalyst by impregnating an inert support with a nickel salt solution, drying and calcining; then coating alumina thereon from an alumina suspension, drying and calcining; and then calcining the coated support with a rhodium salt solution, drying, and calcining to decompose the rhodium salt.
Claim 13
Independent Claim
49 words
The method of preparing a catalyst by impregnating an inert support with a nickel salt solution, drying and calcining; then coating alumina thereon from an alumina suspension, drying and calcining; and then calcining the coated support with a rhodium salt solution, drying, and calcining to decompose the rhodium salt.
Claim 14
Dependent Claim
27 words
The process of claim 10 in which the coating of alumina is followed by calcining at temperature above 700*C prior to impregnating with the rhodium salt solution.
Claim 15
Dependent Claim
44 words
The process of claim 10 in which the coating of alumina is followed by calcining at 870*C to the appearance of nickel aluminate, becoming a much brighter green than that characteristic of material calcined at 600*C, prior to impregnating with the rhodium salt solution.
Claim 16
Dependent Claim
55 words
The process of claim 10 in which the drying and calcining steps are at 110* to 200*C and 400* to 600*C, respectively and the amounts are such as to give 0.5 to 50 weight parts nickel, 0.1 to 20 weight parts alumina, and 0.0005 to 0.05 weight parts rhodium, per 100 weight parts inert support.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |