US5155077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for purification of lean-burn engine exhaust gas
Assignee: Ford Motor Co
•
Filing: 1991-09-03
•
Granted: 1992-10-13
•
Expires: 2011-09-03
Abstract
Abstract A dual-phase zeolite having a transition metal-containing zeolite phase and a transition metal-containing oxide phase. The catalytic material may be an intimate mixture of a phase-layered structure of a first phase constituted preferably of a copper-containing high silica zeolite and a second phase constituted of copper-containing zirconia. Methods are also disclosed for making a single-stage catalyst for removing NO x and HC at high efficiency in an oxygen-rich automotive exhaust gas, and for treating the exhaust gas with the dual-phase catalyst above.
Inventors
- 👤 Clifford Montreuil
- 👤 Haren S. Gandhi
- 👤 Mohinder S. Chattha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:17
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/072; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
47 words
A catalyst for purification of lean-burn engine exhaust gas, comprising: a dual-phase, high silica zeolite supported on a high surface area substrate, the first phase consisting of a catalytic transition metal containing oxide and the second phase consisting of a catalytic transition metal containing high silica zeolite.
Claim 2
Dependent Claim
47 words
A catalyst for purification of lean-burn engine exhaust gas, comprising: a dual-phase, high silica zeolite supported on a high surface area substrate, the first phase consisting of a catalytic transition metal containing oxide and the second phase consisting of a catalytic transition metal containing high silica zeolite.
Claim 3
Dependent Claim
14 words
The catalyst as in claim 1, in which said substrate is an alumina carrier.
Claim 4
Dependent Claim
31 words
The catalyst as in claim 1, in which said transition metal is selected from the group consisting of Cu, Co, Ni, Cr, Fe, Mn, Ag, Zn, Ca, and compatible mixtures thereof.
Claim 5
Dependent Claim
23 words
The catalyst as in claim 1, in which said zeolite has a SiO 2 /Al 2 O 3 molar ratio greater than 10.
Claim 6
Dependent Claim
34 words
The catalyst as in claim 4, in which said zeolite is ultrastable, of the form 2XM/ n .XAl 2 O 3 .YSiO 2 , where M is the cation and n is the valance.
Claim 7
Dependent Claim
36 words
The catalyst as in claim 1, in which said zeolite, regardless of the metal replacing the cation, retains a spatial arrangement of aluminum, silicon, and oxygen that forms a basic crystal lattice that remains essentially unchanged.
Claim 8
Dependent Claim
26 words
The catalyst as in claim 1, in which said oxide is selected from the group consisting of zirconia, lanthana, titania, silica, zirconium aluminate, and barium hexaluminate.
Claim 9
Dependent Claim
19 words
The catalyst as in claim 1, in which the ratio of said phases is in the range of 90/10-10/90.
Claim 10
Dependent Claim
23 words
The catalyst as in claim 1, in which said oxide is zirconia present in an amount of 0.1-20 weight percent of said catalyst.
References Cited (Backward Citations)
US3374183A
Cited
US3180712A
Cited
US3284370A
Cited
US3544264A
Cited
US3702236A
Cited
US3896616A
Cited
US3914377A
Cited
US3953576A
Cited
US4188364A
Cited
US4100262A
Cited
US4297328A
Cited
US4377502A
Cited
US4705675A
Cited
JPS62284480A
Cited
JPS62292914A
Cited
JPS62291258A
Cited
JPS62292915A
Cited
JPS62296423A
Cited
JPS62296422A
Cited
US4934142A
Cited
DE3912596A1
Cited
US5017538A
Cited
US4985210A
Cited
US4962075A
Cited
US4973399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-13 | 1996-04-13 | 1996-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-13 | 2000-04-13 | 2000-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-13 | 2004-04-13 | 2004-10-13 | $7700.00 | Window Closed / Lapsed |