US4921823A
Expired / Lapsed
US
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Porous anodic aluminium oxide membrane catalyst support
Assignee: Rio Tinto Alcan International Ltd
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Filing: 1989-02-01
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Granted: 1990-05-01
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Expires: 2009-02-01
Abstract
Abstract A catalyst device comprises a porous catalytically active inorganic membrane, means for presenting a fluid reactant to a first surface of the membrane and means for recovering a fluid reaction product from the second surface of the membrane. The membrane is preferably an anodic aluminum oxide membrane with a deposit of catalytically active material present within the pores, preferably concentrated in the ends of the pores adjacent the second surface of the membrane.
Inventors
- 👤 Robin C. Furneaux
- 👤 Alexander P. Davidson
- 👤 Melville D. Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:07
CPC Classifications
B; B01; B01J; B01J4/00; B01J4/04; B01J19/00; B01J19/24; B01J19/2475; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/38; B01J23/40; B01J35/00; B01J35/30; B01J35/396; B01J35/50; B01J35/58; B01J37/00; B01J37/34; B01J37/348
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
An inorganic membrane having first and second surfaces with pores extending through the membrane from one surface to the other, wherein a deposit of a catalytically active material is present within the pores, the deposit being concentrated in the ends of the pores adjacent one surface of the membrane.
Claim 2
Dependent Claim
49 words
An inorganic membrane having first and second surfaces with pores extending through the membrane from one surface to the other, wherein a deposit of a catalytically active material is present within the pores, the deposit being concentrated in the ends of the pores adjacent one surface of the membrane.
Claim 3
Dependent Claim
32 words
A membrane as claimed in claim 1, having a system of larger pores extending in from one surface and interconnecting with a system of smaller pores extending in from the other surface.
Claim 4
Dependent Claim
29 words
A membrane as claimed in claim 2, which is a composite membrane comprising an inorganic membrane with relatively larger pores and an overlying inorganic film with relatively smaller pores.
Claim 5
Dependent Claim
18 words
A membrane as claimed in claim 2, wherein the catalytically active material is present in the smaller pores.
Claim 6
Dependent Claim
14 words
A membrane as claimed in claim 2, wherein the membrane is of aluminium oxide.
Claim 7
Dependent Claim
18 words
A membrane as claimed in claim 5, wherein the membrane is or comprises an anodic aluminium oxide membrane.
Claim 8
Dependent Claim
92 words
A catalyst device comprising an inorganic membrane having first and second surfaces with pores extending through the membrane from one surface to the other, wherein a deposit of catalytically active material is present within the pores of the membrane and is concentrated at the ends of the pores adjacent the second surface of the membrane, means for presenting to the first surface a fluid reactant of a chemical reaction able to be catalysed by the said membrane and means for recovering from the second surface a fluid product of the catalysed reaction.
Claim 9
Dependent Claim
92 words
A catalyst device comprising an inorganic membrane having first and second surfaces with pores extending through the membrane from one surface to the other, wherein a deposit of catalytically active material is present within the pores of the membrane and is concentrated at the ends of the pores adjacent the second surface of the membrane, means for presenting to the first surface a fluid reactant of a chemical reaction able to be catalysed by the said membrane and means for recovering from the second surface a fluid product of the catalysed reaction.
Claim 10
Dependent Claim
15 words
A catalyst device as claimed in claim 7, wherein the membrane is of aluminium oxide.
Claim 11
Dependent Claim
19 words
A catalyst device as claimed in claim 8, wherein the membrane is or comprises an anodic aluminium oxide membrane.
Claim 12
Dependent Claim
40 words
A catalyst device as claimed in claim 7, wherein the membrane is an asymmetric membrane having a system of larger pores extending in from one face and interconnecting with a system of smaller pores extending in from the other face.
Claim 13
Dependent Claim
23 words
A catalyst device as claimed in claim 10, wherein a deposit of catalytically active material is present within the system of larger pores.
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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |