US4258025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pd/SiO2 Hydrogenation catalyst suitable for H2 O2 manufacture
Assignee: Arkema Inc
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Filing: 1979-11-02
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Granted: 1981-03-24
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Expires: 1999-11-02
Abstract
Abstract An amorphous silica supported palladium catalyst is provided which also contains a small amount of an additive metal compound selected from an oxide, hydroxide and carbonate of zirconium, thorium, hafnium, cerium, titanium and aluminum. By use of particular preparation conditions and the amount of additive metal salt raw material used, the additive metal compound deposits from solution before or simultaneously with a palladium compound. The additive metal compound deposits on the silica support and serves as a base for the subsequently deposited palladium compound which is later reduced to palladium metal. The described catalyst is particularly suitable as a hydrogenation catalyst in a cyclic process for the manufacture of hydrogen peroxide.
Inventors
- 👤 Harry B. Copelin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:16
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J23/54; B01J23/56; B01J23/63
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
In a process for producing hydrogen peroxide by alternately hydrogenating an alkylanthraquinone and/or a tetrahydroalkylanthraquione and oxygenating the resulting alkylanthrahydroquinone and/or tetrahydroalkylanthrahydroquinone to regenerate the alkylanthraquinone and/or tetrahydroalkylanthraquinone and to produce hydrogen peroxide, the improvement comprising conducting the hydrogenation in the presence of a catalyst consisting essentially of an amorphous silica support having deposited thereon about 0.05-5 percent by weight based on the weight of silica of at least one oxide, hydroxide or carbonate of at least one metal selected from the group consisting of zirconium, thoriium, hafnium, cerium, and titanium and about 0.1-10 percent by weight based on the weight of silica of palladium metal; the metal oxide, hydroxide or carbonate being deposited before or simultaneously with the palladium metal in the form of its oxide, hydroxide or carbonate.
Claim 2
Dependent Claim
130 words
In a process for producing hydrogen peroxide by alternately hydrogenating an alkylanthraquinone and/or a tetrahydroalkylanthraquione and oxygenating the resulting alkylanthrahydroquinone and/or tetrahydroalkylanthrahydroquinone to regenerate the alkylanthraquinone and/or tetrahydroalkylanthraquinone and to produce hydrogen peroxide, the improvement comprising conducting the hydrogenation in the presence of a catalyst consisting essentially of an amorphous silica support having deposited thereon about 0.05-5 percent by weight based on the weight of silica of at least one oxide, hydroxide or carbonate of at least one metal selected from the group consisting of zirconium, thoriium, hafnium, cerium, and titanium and about 0.1-10 percent by weight based on the weight of silica of palladium metal; the metal oxide, hydroxide or carbonate being deposited before or simultaneously with the palladium metal in the form of its oxide, hydroxide or carbonate.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the silica is essentially iron-free.
Claim 4
Dependent Claim
37 words
The process of claim 1 wherein the amorphous silica support is silica gel particles having an average particle size distribution in the range of about 10-300 microns and a surface area of about 20-600 m 2 /g.
Claim 5
Dependent Claim
50 words
The process of claim 1 wherein the amorphous silica support is silica gel particles having a surface area in the range of about 100-350 m 2 /g and about 0.1-2 percent by weight of the silica of an oxide, hydroxide or carbonate of zirconium, thorium or titanium is deposited thereon.
Claim 6
Dependent Claim
18 words
The process of claims 2, 3 or 5 wherein the metal oxide, hydroxide or carbonate is zirconium oxide.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |