Patent US4233183A successfully refreshed from Google Patents.
US4233183A
Expired / Lapsed
US
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Process for producing plate-shaped denitrating catalyst
Assignee: Kanadevia Corp
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Filing: 1979-02-06
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Granted: 1980-11-11
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Expires: 1999-02-06
Abstract
Abstract A plate-shaped denitrating catalyst is produced by the steps of preparing a slurry from hydrated titania and a sol selected from the group consisting of silica sol, alumina sol and titania sol, firing the slurry to obtain a porous material, pulverizing the porous material to a powder, causing a metal net to support the powder thereon with a binder to form a plate-like piece, drying or firing the piece to obtain a porous carrier and depositing a catalytically active component on the carrier.
Inventors
- 👤 Hideya Inaba
- 👤 Kenichi Nagai
- 👤 Yasumi Kamino
- 👤 Kazuo Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:39
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/02; B01J37/024; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J35/00; B01J35/50; B01J35/58; B01D2251/00; B01D2251/20; B01D2251/206; B01D2251/2062; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/20; B01D2255/207
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A process for producing a catalyst for reducing nitrogen oxides in exhaust gases and comprising the steps of preparing a slurry from hydrated titania and a sol selected from the group consisting of silica sol, alumina sol and titania sol, firing the slurry to obtain a porous material, pulverizing the porous material to a powder, supporting the powder on a metal net with an inorganic dehydration-condensed binder and filling the openings of the net to form a plate-like piece having the metal net as its core, drying or firing the piece to obtain a porous carrier and depositing a catalytically active component on the porous carrier.
Claim 2
Dependent Claim
106 words
A process for producing a catalyst for reducing nitrogen oxides in exhaust gases and comprising the steps of preparing a slurry from hydrated titania and a sol selected from the group consisting of silica sol, alumina sol and titania sol, firing the slurry to obtain a porous material, pulverizing the porous material to a powder, supporting the powder on a metal net with an inorganic dehydration-condensed binder and filling the openings of the net to form a plate-like piece having the metal net as its core, drying or firing the piece to obtain a porous carrier and depositing a catalytically active component on the porous carrier.
Claim 3
Dependent Claim
32 words
A process as defined in claim 1 wherein the inorganic dehydration-condensed binder is a material selected from the group consisting of alumina sol, silica sol, titania sol, phosphoric acid and boric acid.
Claim 4
Dependent Claim
23 words
A process as defined in claim 1 wherein the inorganic dehydration-condensed binder has incorporated therein an organic solvent, polymeric emulsion or carbon fiber.
Claim 5
Dependent Claim
22 words
A process as defined in claim 1 wherein the metal net has been bent or folded to a wavelike or zigzag form.
Claim 6
Dependent Claim
15 words
A process as defined in claim 1 wherein the metal net has a honeycomb structure.
Claim 7
Dependent Claim
27 words
A process as defined in claim 1 wherein the plate-like piece is formed by coating the metal net with a slurry of the powder and the binder.
Claim 8
Dependent Claim
37 words
A process as defined in claim 1 wherein the active component is a metal selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Sn, Sb, Bi, W, Pt, Rh and Pd.
Claim 9
Dependent Claim
18 words
A process as defined in claim 1 wherein the catalyst has a thickness of 0.5 to 2.0 mm.
Claim 10
Dependent Claim
17 words
A catalyst produced by the process defined in any one of claims 1 to 7 and 8.
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |