US4280926A
Expired / Lapsed
US
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Method for producing a catalyst and a carrier therefor
Assignee: Sakai Chemical Industry Co Ltd
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Filing: 1979-09-05
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Granted: 1981-07-28
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Expires: 1999-09-05
Abstract
Abstract A method is provided for producing a catalyst and a carrier therefor in the form of sheet or honeycomb. The method comprises: beating a heat-resistant fiber such as asbesto fiber in water to form a slurry; mixing the slurry with a catalytically active agent, a carrier material therefor and/or their precursors to fix such materials in the fiber, thus forming a stock; and forming the stock into a sheet and drying the same. The sheet thus obtained may be formed into a honeycomb structure with an improved adhesive.
Inventors
- 👤 Kazunobu Abe
- 👤 Tadao Nakatsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:21
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/26; B32B3/28; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01J; B01J35/00; B01J35/50; B01J35/56; B01J35/57; B01J35/58; B32B1/00; B32B19/00; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B7/00; B32B7/04; B32B7/12; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N3/2828; B01D2251/00; B01D2251/20; B01D2251/206; B01D2251/2062; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/20707; B01D2255/20723; B01D2255/20738; B01D2255/20761; B01D2255/20769; B01D2255/20776; B01D2255/90; B01D2255/92; B01D2255/9202; B32B2262/00; B32B2262/10; B32B2262/101; B32B2262/105; B32B2262/106; B32B2262/108; F01N2330/00; F01N2330/06; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
227 words
A method for producing a catalytic material for the reduction of nitrogen oxides in the presence of ammonia, which consists essentially of admixing: (a) a slurry prepared by beating at least one of inorganic heat-resistant fibers of about 1-20 mm in fiber length and of about 0.1-30 microns in diameter selected from the group consisting of asbestos fiber, silica fiber, silica-alumina fiber, chrysotile fiber, rock wool, glass fiber, anthophyllite fiber, potassium titanate fiber, carbon fiber and ceramic fiber, in water, (b) at least one powdery catalytic material having a particle size of about 0.01 to 50 microns and being an oxide selected from the group consisting of Cu, Fe, V, W and Mo or precursor thereof which is a water-insoluble, powdery compound which will be converted into catalytic material when calcined and, (c) a powdery carrier material which is at least one oxide of a metal selected from the group consisting of Ti and Al or a precursor which is a water-insoluble, powdery compound which will be converted into the oxide when calcined, thereby forming a stock material containing solid components in an amount of 1 to 10% by weight with about 80 to 40 parts by weight of fibers in relation to 20 to 60 parts by weight of the total powdery material, forming the stock into a sheet by paper-making means and drying the sheet.
Claim 2
Independent Claim
227 words
A method for producing a catalytic material for the reduction of nitrogen oxides in the presence of ammonia, which consists essentially of admixing: (a) a slurry prepared by beating at least one of inorganic heat-resistant fibers of about 1-20 mm in fiber length and of about 0.1-30 microns in diameter selected from the group consisting of asbestos fiber, silica fiber, silica-alumina fiber, chrysotile fiber, rock wool, glass fiber, anthophyllite fiber, potassium titanate fiber, carbon fiber and ceramic fiber, in water, (b) at least one powdery catalytic material having a particle size of about 0.01 to 50 microns and being an oxide selected from the group consisting of Cu, Fe, V, W and Mo or precursor thereof which is a water-insoluble, powdery compound which will be converted into catalytic material when calcined and, (c) a powdery carrier material which is at least one oxide of a metal selected from the group consisting of Ti and Al or a precursor which is a water-insoluble, powdery compound which will be converted into the oxide when calcined, thereby forming a stock material containing solid components in an amount of 1 to 10% by weight with about 80 to 40 parts by weight of fibers in relation to 20 to 60 parts by weight of the total powdery material, forming the stock into a sheet by paper-making means and drying the sheet.
Claim 3
Dependent Claim
39 words
The method as claimed in claim 1 further comprising: immersing the sheet in an impregnating slurry or solution containing catalytically active agents, carrier materials, their precursors or a mixture of at least two of these; and drying the sheet.
Claim 4
Dependent Claim
46 words
The method as claimed in claim 1 further comprising: forming the sheet into a honeycomb structure; immersing the structure in an impregnating slurry or solution containing catalytically active agents, carrier materials, their precursors or a mixture of at least two of these; and drying the structure.
Claim 5
Independent Claim
98 words
The method as claimed in claims 2 or 3, wherein the impregnating slurry or solution further contains 1-10 parts by weight of at least one inorganic heat-resistant fiber of about 0.1-30 microns in diameter and about 0.5-5 mm in fiber length selected from the group consisting of asbestos fiber, ceramic fiber, silica fiber, silica-alumina fiber, chrysotile fiber, rock wool, glass fiber, potassium titanate fiber, anthophyllite fiber and carbon fiber, or about 0.5-5 parts of weight of polytetrafluoroethylene fiber, in relation to 100 parts by weight of the total weight of catalytically active agents, carrier materials and their precursors.
Claim 6
Dependent Claim
174 words
The method as claimed in claim 1 further comprising: forming the sheet into a honeycomb structure with an adhesive which comprises 100 parts by weight of an aqueous colloidal silica solution containing about 10-30% by weight of silica of about 1-100 millimicrons in particle size and about 10-45 millimicrons in average particle size, and 1-50 parts by weight of at least one finely divided refractory oxide particles selected from the group consisting of silica having specific surface area of 100-400 m 2 /g, primary particle size of 25-150 millimicrons and average particle size of 40-200 millimicrons, alumina having specific surface area of 100-300 m 2 /g, primary particle size of 10-150 millimicrons and average particle size of 30-70 millimicrons, silica-alumina having specific surface area of about 200 m 2 /g, primary particle size of 1-80 millimicrons and average particle size of 10-30 millimicrons, and titania having specific surface area of about 50 m 2 /g, primary particle size of 10-120 millimicrons and average particle size of 15-40 millimicrons, uniformly dispersed in the colloidal solution.
Claim 7
Dependent Claim
32 words
The method as claimed in claim 5, wherein the adhesive further contains 0.01-15 parts by weight of an organic polymer selected from the group consisting of polyethylene oxide, carboxymethylcellulose, methylcellulose and polyvinylalcohol.
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) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |