US4048113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic combustion mass
Assignee: Lyonnaise des Applications Catalytiques Ste
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Filing: 1975-10-21
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Granted: 1977-09-13
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Expires: 1995-10-21
Abstract
Abstract Contact mass for heterogeneous catalysis, characterized in that it comprises a support of alumina fibers having a large specific surface and good thermal stability, on which is deposited a catalyst comprising at least one element chosen from metals of crude platinum belonging to group VIII of the periodic table of elements, a gas supply device being provided which allows appropriate distribution of the combustible gas.
Inventors
- 👤 Roger Paul Pierre Risse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:28
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/50; B01J35/58; B01J23/00; B01J23/38; B01J23/40; B01J23/54; B01J23/56; B01J23/64; B01J23/652
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
A contact mass for heterogeneous catalysts which comprises: a sheet having a thickness of 5 to 20 mm of alumina fibers of a mean diameter of the order of 3 microns with a specific surface area of about 120 to 150 m 2 /g and having a decrease in specific surface area of only 11 to 15% upon heating to 700° C
Claim 2
Dependent Claim
62 words
A contact mass for heterogeneous catalysts which comprises: a sheet having a thickness of 5 to 20 mm of alumina fibers of a mean diameter of the order of 3 microns with a specific surface area of about 120 to 150 m 2 /g and having a decrease in specific surface area of only 11 to 15% upon heating to 700° C
Claim 3
Dependent Claim
8 words
a coating of platinum catalyst on said fibers;
Claim 4
Dependent Claim
8 words
a coating of platinum catalyst on said fibers;
Claim 5
Dependent Claim
22 words
a layer of mineral wool in contact with said sheet and capable of withstanding a surface temperature of at least 500° C.
Claim 6
Dependent Claim
22 words
a layer of mineral wool in contact with said sheet and capable of withstanding a surface temperature of at least 500° C.
Claim 7
Dependent Claim
21 words
The contact mass defined in claim 1 wherein the sheet of alumina fibers has a thickness of 10 to 15 mm.
Claim 8
Dependent Claim
14 words
The contact mass defined in claim 1 wherein the coating further comprises chromium catalyst.
Claim 9
Dependent Claim
14 words
The contact mass defined in claim 1 wherein the coating further comprises cerium catalyst.
Claim 10
Dependent Claim
17 words
The contact mass defined in claim 1 wherein the coating further comprises thorium as a recrystallization inhibitor.
Claim 11
Dependent Claim
97 words
A contact mass for heterogeneous catalysts which comprises: a sheet having a thickness of 5 to 20 mm of alumina fibers of a mean diameter of the order of 3 microns with a specific surface area of about 120 to 150 m 2 /g and having a decrease in specific surface area of only 11 to 15% upon heating to 700° C; a coating of a catalyst of a platinum group metal on said fibers; a layer of mineral wool in contact with said sheet and capable of withstanding a surface temperature of at least 500° C.
Claim 12
Dependent Claim
97 words
A contact mass for heterogeneous catalysts which comprises: a sheet having a thickness of 5 to 20 mm of alumina fibers of a mean diameter of the order of 3 microns with a specific surface area of about 120 to 150 m 2 /g and having a decrease in specific surface area of only 11 to 15% upon heating to 700° C; a coating of a catalyst of a platinum group metal on said fibers; a layer of mineral wool in contact with said sheet and capable of withstanding a surface temperature of at least 500° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |