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US3635841A Expired / Lapsed US ⏱️ 0.0 years remaining

Novel anthraquinone hydrogenation catalyst

Assignee: Engelhard Minerals and Chemicals Corp
•
Filing: 1969-06-16
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Granted: 1972-01-18
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Expires: 1989-06-16
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Abstract

Abstract A novel hydrogenation catalyst, especially useful for the catalytic hydrogenation of an anthraquinone working compound in the process for producing hydrogen peroxide, is described containing at least 0.05 percent by weight of metallic palladium dispersed on alumina supporting spheres, wherein the major crystalline structure of the alumina spheres is in the form of delta-alumina, theta-alumina, or mixtures of delta- and thetaaluminas and is substantially free of alpha-alumina, gammaalumina or alpha-alumina monohydrate, wherein the alumina spheres have substantially no pores larger than about 0.06 micron, a BET surface area of over 20 m.2/gm., and wherein the palladium metal penetration into the pores of the supporting alumina surface is no more than about 40 or 50 microns.

Inventors

  • 👤 Carl D Keith
  • 👤 Kurt W Cornely
  • 👤 Nathan D Lee

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 05:41
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/38; B01J23/40; B01J23/44; C; C01; C01B; C01B15/00; C01B15/01; C01B15/022; C01B15/023; B01J35/00; B01J35/60; B01J37/00; B01J37/02; B01J37/0215

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 22 words
The hydrogenation catalyst of claim 1 wherein the catalyst has a BET surface area of from about 90 to about 110 m.2/g.
Claim 2
Dependent Claim 42 words
The hydrogenation catalyst of claim 1 wherein the catalyst has about 0.3 percent by weight of palladium, has a size of about 10 mesh, and said alumina supporting spheres are predominantly theta-alumina and have a BET surface area of about 90 m.2/g.

References Cited (Backward Citations)

US3009782A Cited
US3113980A Cited
US3271327A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-01-17 1975-07-19 1976-01-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-01-17 1979-07-19 1980-01-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-01-17 1983-07-19 1984-01-18 $7700.00 Window Closed / Lapsed

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