US3907710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow ceramic pellets for catalyst support
Assignee: WR Grace and Co
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Filing: 1973-04-18
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Granted: 1975-09-23
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Expires: 1993-04-18
Abstract
Abstract A support structure useful in catalyst systems for converting the noxious components of automobile exhaust gases to innocuous entities is disclosed. The support is in the form of reinforced tubular structure and is characterized by excellent stability and very high surface area per unit weight. The structure is also useful as a packing medium for reaction towers, as a support for catalysts in organic reactors and as a support for adsorbent materials.
Inventors
- 👤 Christian Bent Lundsager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:55
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63408; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J35/00; B01J35/30; B01J35/34; B01J35/37; B01J35/50; B01J35/55; B01J37/00; B01J37/0009; B01J37/0018; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; B01J2235/00; B01J35/56; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y10; Y10S; Y10S502/00; Y10S502/524
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A CATALYST FOR CONVERTING CARBON MONOXIDE, HYDROCARBONS AND NITROGEN OXIDES IN AUTO EXHAUST GASES TO INNOCOUS ENTITIES CONSISTING ESSENTIALLY OF PLATIUM OR PALLADIUM DISTENDED AS A COATING OF ALUMINA CONTAINING ABOUT 5 TO 20 WEIGHT PERCENT CERIA ON A POROUS TABULAR CERAMIC SUPPORT WITH INTERNAL REINFORCING RIBS, HAVING A DIAMETER OF ABOUT 3 TO 12 MM AND LENGTH ABOUT EQUAL TO THE DIAMETER SAID SUPPORT CHARACTERIZED BY: A. A GEOMETRIC SURFACE AREA OF ABOUT AT LEAST 50% GREATER THAN A HOLLOW TUBE OF THE SAME DIAMETER, B. A SURFACE AREA APPROXIMATELY 3 TIMES GREATER THAN THE SURFACE AREA OF SOLID PARTICLES, C. A CRUSH STRENGTH OF AT LEAST 10 POUNDS, AND, D. A MICROPOROSITY OF 20 TO 50% BY VOLUME.
Claim 2
Dependent Claim
120 words
A CATALYST FOR CONVERTING CARBON MONOXIDE, HYDROCARBONS AND NITROGEN OXIDES IN AUTO EXHAUST GASES TO INNOCOUS ENTITIES CONSISTING ESSENTIALLY OF PLATIUM OR PALLADIUM DISTENDED AS A COATING OF ALUMINA CONTAINING ABOUT 5 TO 20 WEIGHT PERCENT CERIA ON A POROUS TABULAR CERAMIC SUPPORT WITH INTERNAL REINFORCING RIBS, HAVING A DIAMETER OF ABOUT 3 TO 12 MM AND LENGTH ABOUT EQUAL TO THE DIAMETER SAID SUPPORT CHARACTERIZED BY: A. A GEOMETRIC SURFACE AREA OF ABOUT AT LEAST 50% GREATER THAN A HOLLOW TUBE OF THE SAME DIAMETER, B. A SURFACE AREA APPROXIMATELY 3 TIMES GREATER THAN THE SURFACE AREA OF SOLID PARTICLES, C. A CRUSH STRENGTH OF AT LEAST 10 POUNDS, AND, D. A MICROPOROSITY OF 20 TO 50% BY VOLUME.
Claim 3
Dependent Claim
29 words
The catalyst according to claim 1 wherein the catalyst is a platinum or palladium catalyst wherein the platinum or palladium is present in a 1 to 3 weight ratio.
Claim 4
Dependent Claim
15 words
The catalyst according to claim 1 wherein the ceramic is cordierite, mullite, alumina or spinel.
Claim 5
Dependent Claim
40 words
The catalyst according to claim 1 wherein the tubular ceramic support is coated with about 5 to 10 weight percent of an alumina containing about 0.02 to 0.08 weight percent platinum or palladium based on the weight of the catalyst.
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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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |