Patent US3999079A successfully refreshed from Google Patents.
Patent US4062810A successfully refreshed from Google Patents.
US4062810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrier-supported catalyst
Assignee: Hoechst AG
•
Filing: 1976-08-27
•
Granted: 1977-12-13
•
Expires: 1996-08-27
Abstract
Abstract The invention provides a carrier-supported catalyst, wherein alumina partially converted to alpha -Al2O3 is the carrier having between 0.2 and 10 weight % of cerium in oxide form deposited thereon as the catalytically active ingredient.
Inventors
- 👤 Wilhelm Vogt
- 👤 Hermann Glaser
- 👤 Helmut Dyrschka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/10; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J37/00; B01J37/0009; B01J37/0018
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
127 words
A carrier-supported catalyst, wherein the active ingredient consists essentially of cerium in oxide form and wherein 0.2 to 10 weight% of cerium, based on the carrier, is deposited thereon and wherein the carrier is produced by suspending aluminum oxide selected from the group consisting of delta-alumina and boehmite, and having an alkali content of up to 0.2 weight%, in water; heating the resulting highly viscous magma so as to form a dry mass; admixing graphite to the dry mass and grinding it; compressing the ground graphite-containing mass into shapes; burning off the graphite from the shapes at temperatures within the range 550° to 750° C; and calcining the shapes for periods within the range 10 to 20 hours at temperatures within the range 1000° to 1250° C.
Claim 2
Dependent Claim
127 words
A carrier-supported catalyst, wherein the active ingredient consists essentially of cerium in oxide form and wherein 0.2 to 10 weight% of cerium, based on the carrier, is deposited thereon and wherein the carrier is produced by suspending aluminum oxide selected from the group consisting of delta-alumina and boehmite, and having an alkali content of up to 0.2 weight%, in water; heating the resulting highly viscous magma so as to form a dry mass; admixing graphite to the dry mass and grinding it; compressing the ground graphite-containing mass into shapes; burning off the graphite from the shapes at temperatures within the range 550° to 750° C; and calcining the shapes for periods within the range 10 to 20 hours at temperatures within the range 1000° to 1250° C.
Claim 3
Dependent Claim
195 words
A process for making the carrier-supported catalyst as claimed in claim 1, which comprises suspending aluminum oxide selected from the group consisting of delta-alumina and boehmite, and having an alkali content of up to 0.2 weight%, in water; heating the resulting highly viscous magma so as to form a dry mass; admixing graphite to the dry mass and grinding it; compressing the ground graphite-containing mass into shapes; burning off the graphite from the shapes at temperatures within the range 550° to 750° C; calcining the shapes for periods within the range 10 to 20 hours at temperatures within the range 1000° to 1250° C impregnating the shapes with an aqueous solution of a cerium salt of a readily decomposable acid; drying the cerium salt so applied to the shapes for periods within the range 16 to 64 hours at temperatures within the range 130° to 150° C; decomposing the dry cerium salt by heating the shapes first at temperatures within the range 200° to 300° C and thereafter at temperatures within the range 450° to 550° C, respectively; and annealing the resulting shapes containing cerium oxide at temperatures within the range 700° to 900° C.
Claim 4
Dependent Claim
25 words
The process as claimed in claim 2, wherein between 3 and 10 weight% of graphite is admixed to the dry mass prior to grinding it.
Claim 5
Dependent Claim
19 words
The process as claimed in claim 2, wherein the cerium salt of a readily decomposable acid is cerium nitrate.
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) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |