Patent US4284530A successfully refreshed from Google Patents.
US4284530A
Expired / Lapsed
US
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Novel support for catalysts
Assignee: Syensqo USA LLC
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Filing: 1979-12-17
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Granted: 1981-08-18
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Expires: 1999-12-17
Abstract
Abstract A catalyst for the oxidation of sulfur dioxide comprising vanadium supported by a microporous carrier is disclosed. The microporous carrier is characterized by a silica content greater than 85 percent, an alumina content greater than 3 but less than 5 percent, an iron content less than 2.0 percent, a surface area greater than 10 m2/g, a bulk density more than 0.10 and less than 0.35 g/cc, a mean pore diameter greater than 0.3 and less than 2.5 micrometers, a pore volume greater than 2 ml/g, and a porosity greater than 65 percent. The product containing vanadium is easily extrudable into pellets or other shaped forms to give both a durable and highly active catalyst. Diatomaceous earths of the Actinoptychus class, especially Actinoptychus undulata, and of the Coscinadiscus class meet the criteria stated above, as do some acid-leached montmorillonite clays.
Inventors
- 👤 Fawzy G. Sherif
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:13
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/76; C01B17/78; C01B17/79; B01J35/61; B01J35/613; B01J35/63; B01J35/638; B01J35/64; B01J35/653
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A vanadium-containing catalyst for oxidizing sulfur dioxide supported by a microporous siliceous material said support characterized by: (a) a silica content greater than 85 percent by weight; (b) an alumina content greater than 3 but less than 5 percent by weight; (c) an iron content less than 2 percent by weight; (d) a surface area greater than 10 m 2 /g; (e) a bulk density greater than 0.10 and less than 0.35 g/cc; (f) a mean pore diameter greater than 0.3 and less than 2.5 micrometers; (g) a pore volume greater than 65 percent; and (h) a porosity greater than 65 percent; whereby a catalyst with high catalytic activity and high durability is provided.
Claim 2
Dependent Claim
114 words
A vanadium-containing catalyst for oxidizing sulfur dioxide supported by a microporous siliceous material said support characterized by: (a) a silica content greater than 85 percent by weight; (b) an alumina content greater than 3 but less than 5 percent by weight; (c) an iron content less than 2 percent by weight; (d) a surface area greater than 10 m 2 /g; (e) a bulk density greater than 0.10 and less than 0.35 g/cc; (f) a mean pore diameter greater than 0.3 and less than 2.5 micrometers; (g) a pore volume greater than 65 percent; and (h) a porosity greater than 65 percent; whereby a catalyst with high catalytic activity and high durability is provided.
Claim 3
Dependent Claim
22 words
A catalyst as described in claim 1 with a vanadium content between one and ten percent by weight expressed as vanadium pentoxide.
Claim 4
Dependent Claim
26 words
A catalyst as described in claim 1 wherein said microporous siliceous support comprises a major portion of particles of the Actinoptychus type of marine diatomaceous earth.
Claim 5
Dependent Claim
26 words
A catalyst as described in claim 1 wherein said microporous siliceous support comprises a major portion of particles of the Actinoptychus undulatus type of diatomaceous earth.
Claim 6
Dependent Claim
22 words
A catalyst as described in claim 1 wherein said microporous siliceous support comprises a major portion of particles of acid-leached montmorillonite clay.
Claim 7
Dependent Claim
13 words
A catalyst as described in claim 1 in the form of cylindrical pellets.
Claim 8
Dependent Claim
12 words
A catalyst as described in claim 1 in the form of tablets.
Claim 9
Dependent Claim
12 words
A catalyst as described in claim 1 in the form of spheres.
Claim 10
Dependent Claim
26 words
A catalyst as described in claim 1 in the form of a powder a major portion of whose particles are less than twenty micrometers in diameter.
Claim 11
Dependent Claim
34 words
In a vanadium-containing catalyst carried on a microporous siliceous support the improvement comprising the use of diatomaceous earth of the Actinoptychus class as the support, whereby both high durability and high catalytic activity result.
Claim 12
Dependent Claim
34 words
In a vanadium-containing catalyst carried on a microporous siliceous support the improvement comprising the use of diatomaceous earth of the Actinoptychus class as the support, whereby both high durability and high catalytic activity result.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |