US4045369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-based catalytic composition for the oxidation of ethylene to ethylene oxide and methanol to formaldehyde
Assignee: SAES Getters SpA
•
Filing: 1976-03-26
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Granted: 1977-08-30
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Expires: 1996-03-26
Abstract
Abstract A catalytic composition having up to 10% barium, strontium and/or calcium, up to 8% indium, balance silver useful in oxidation reactions.
Inventors
- 👤 Angelo Cantaluppi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:47
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10; B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; B01J23/70; B01J23/89; B01J23/8933; B01J23/896; C07C; C07C45/00; C07C45/27; C07C45/32; C07C45/37; C07C45/38; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
56 words
Catalytic composition based on silver comprising: A. from 0.001 to 10% based on the weight of silver of an oxide of a metal selected from the group consisting of barium, strontium and calcium, B. from 0.001 to 8% based on the weight of silver of an oxide of indium, C. the balance consisting essentially of silver.
Claim 2
Dependent Claim
56 words
Catalytic composition based on silver comprising: A. from 0.001 to 10% based on the weight of silver of an oxide of a metal selected from the group consisting of barium, strontium and calcium, B. from 0.001 to 8% based on the weight of silver of an oxide of indium, C. the balance consisting essentially of silver.
Claim 3
Dependent Claim
60 words
Catalytic composition based on silver according to claim 1 comprising: A. from 0.001 to 5% based on the weight of silver of an oxide of a metal selected from the group consisting of barium, strontium and calcium, B. from 0.01 to 2% based on the weight of silver of an oxide of indium, C. the balance consisting essentially of silver.
Claim 4
Dependent Claim
49 words
Catalytic composition based on silver according to claim 1 comprising: A. from 0.1 to 2% of an oxide of barium based on the weight of silver, B. from 0.05 to 0.5% based on the weight of silver of an oxide of indium, C. the balance consisting essentially of silver.
Claim 5
Dependent Claim
25 words
Catalytic composition according to claim 1 in which Component A is present in an amount between 0.01 and 2% based on the weight of silver.
Claim 6
Dependent Claim
24 words
Catalytic composition according to claim 1 in which indium is present in an amount between 0.05 and 0.5% based on the weight of silver.
Claim 7
Dependent Claim
56 words
Catalytic composition according to claim 1 comprising: A. from 5 to 6% based on weight of silver of an oxide of a metal selected from a group consisting of barium, strontium and calcium, B. from 2.5 to 5% based on the weight of silver of an oxide of indium, C. the balance consisting essentially of silver.
Claim 8
Dependent Claim
34 words
Catalytic composition according to claim 6 comprising: A. 5% of barium based on the weight of silver, B. 4% of indium based on the weight of silver, C. the balance consisting essentially of silver.
Claim 9
Dependent Claim
24 words
Catalytic composition according to claim 1 deposited on a support having a surface area to mass ratio of 0.03 to 10 m 2 /g.
Claim 10
Dependent Claim
27 words
Catalytic composition according to claim 1 in mixture with a powdered material selected from the group consisting of silicon carbide, silicon nitride, boron nitride, silica and alumina.
Claim 11
Dependent Claim
25 words
Catalytic composition according to claim 9 in which the alumina is Al 2 O 3 having a particle size between 40 microns and 100 microns.
Claim 12
Dependent Claim
22 words
Catalytic composition according to claim 10 in which the weight ratio between the catalytic material and Al 2 O 3 is 7:3.
Claim 13
Dependent Claim
9 words
Catalytic composition according to claim 1 comprising furthermore copper.
Claim 14
Dependent Claim
25 words
Catalytic composition according to claim 12 in which the copper is present in an amount between 0.1 and 1% based on the weight of silver.
References Cited (Backward Citations)
US3420784A
Cited
US3960775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |