US4788174A
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US
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Heat resistant catalyst and method of producing the same
Assignee: Toshiba Corp
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Filing: 1987-07-28
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Granted: 1988-11-29
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Expires: 2007-07-28
Abstract
Abstract Excellent heat resistant high activity catalyst which retains catalyst activity at high temperatures of not less than about 1,200° C. is provided.
Inventors
- 👤 Hiromichi Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:54
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/656; B01J23/6562; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/864; B01J23/16; B01J23/24; B01J23/26; B01J23/32; B01J23/34; B01J23/652; B01J23/6522; B01J23/70; B01J23/76; B01J23/78; B01J23/89; B01J23/8933; B01J23/8946
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
127 words
A heat resistant catalyst consisting essentially of compositions of the formula Al 1-z C z B x Al 12-y O 19- α wherein, A is at least one element selected from the group consisting of Ba, Ca and Sr, C is K and/or Rb, B is at least one element selected from the group of Mn, Co, Fe, Ni, Cu and Cr, z is a value in a range of 0- about 0.4, x is a value in a range of about 0.1-4, is a value in a range of x-2x and α is a value which is determined by the valency X, Y, and Z of the respective element A, C and B and the value of x, y and z and is shown as α=1-1/2{X-z(X-Y)+xZ-3Y}.
Claim 2
Dependent Claim
127 words
A heat resistant catalyst consisting essentially of compositions of the formula Al 1-z C z B x Al 12-y O 19- α wherein, A is at least one element selected from the group consisting of Ba, Ca and Sr, C is K and/or Rb, B is at least one element selected from the group of Mn, Co, Fe, Ni, Cu and Cr, z is a value in a range of 0- about 0.4, x is a value in a range of about 0.1-4, is a value in a range of x-2x and α is a value which is determined by the valency X, Y, and Z of the respective element A, C and B and the value of x, y and z and is shown as α=1-1/2{X-z(X-Y)+xZ-3Y}.
Claim 3
Dependent Claim
37 words
A heat resistant catalyst as defined in claim 1, which contains a platinum group noble metal on the surface of the catalyst consisting essentially of A 1-z C z B x Al 12-y O 19- α composition.
Claim 4
Dependent Claim
37 words
A heat resistant catalyst as defined in claim 1 or 2, wherein atomic ratio of the sum of elements A plus C to the sum of element B plus Al is in a range of about (7-10):100.
Claim 5
Dependent Claim
28 words
A heat resistant catalyst as defined in claim 1, wherein the element A is Ba the element C is K, and the element B is Mn and/or Co.
Claim 6
Dependent Claim
20 words
A heat resistant catalyst as defined in claim 1, wherein x is a value in the range of about 0.2-3.
Claim 7
Dependent Claim
53 words
A heat resistant catalyst as defined in claim 1, wherein at least a part of the oxides of the element A and Al in the composition A 1-z C z B x Al 12-y O 19- α is a decomposition product of complexed alkoxides and/or mixed alkoxides of the element A and Al.
Claim 8
Dependent Claim
22 words
A heat resistant catalyst as defined in claim 6, wherein decomposition product of alkoxides is a hydrolysis product or heat decomposition product.
Claim 9
Dependent Claim
18 words
A heat resistant catalyst as defined in claim 6 or 7, wherein the alkoxides have 1-4 carbon atoms.
Claim 10
Dependent Claim
55 words
A heat resistant catalyst as defined in claim 1, wherein at least a part of the composition expressed as the formula A 1-z C z B x Al 12-y O 19- α is in a layered aluminate crystal structure in which the active element C and/or B is taken or fixed in the crystal lattice.
Claim 11
Dependent Claim
20 words
A heat resistant catalyst as defined in claim 1, which is used as a catalyst in a catalytic combustion process.
Claim 12
Dependent Claim
27 words
A heat resistant catalyst as defined in claim 10, which is used as a catalyst in a catalytic combustion process of not less than about 1,000° C.
Claim 13
Independent Claim
141 words
A method of producing a heat resistant catalyst comprising, dissolving and mixing a water soluble and/or alcohol soluble aluminum compound, a water soluble and/or alcohol soluble compound of element A selected from the group consisting of Ca, Ba and Sr, a water soluble and/or alcohol soluble compound of element C selected from the group consisting of K and Rb, a water soluble and/or alcohol soluble compound of element B selected from the group consisting of Mn, Co, Fe, Ni, Cu and Cr in at least one solvent selected from the group consisting of water and alcohol in a (B+Al): (A+C): B:C atomic ratio of about 100: (7-10): (4.2-16.7): (0-3.3) to effect precipitation, hydrolysis and/or thermal decomposition, forming a product in the solution, separating the product from the solution and calcining the product at a temperature of not less than 900° C.
Claim 14
Independent Claim
141 words
A method of producing a heat resistant catalyst comprising, dissolving and mixing a water soluble and/or alcohol soluble aluminum compound, a water soluble and/or alcohol soluble compound of element A selected from the group consisting of Ca, Ba and Sr, a water soluble and/or alcohol soluble compound of element C selected from the group consisting of K and Rb, a water soluble and/or alcohol soluble compound of element B selected from the group consisting of Mn, Co, Fe, Ni, Cu and Cr in at least one solvent selected from the group consisting of water and alcohol in a (B+Al): (A+C): B:C atomic ratio of about 100: (7-10): (4.2-16.7): (0-3.3) to effect precipitation, hydrolysis and/or thermal decomposition, forming a product in the solution, separating the product from the solution and calcining the product at a temperature of not less than 900° C.
Claim 15
Dependent Claim
56 words
A method of producing a heat resistant catalyst as defined in claim 12, wherein the product is obtained by a hydrolysis of complexed or mixed alkoxide of an aluminum alkoxide and an alkoxide of the element A with the use of an aqueous solution of a compound of the element B or elements B and C.
Claim 16
Dependent Claim
51 words
A method of producing a heat resistant catalyst as defined in claim 12, wherein the product is obtained by a hydrolysis of an aluminum alkoxide with the use of an aqueous solution of a compound of the elements A and B or a compound of the elements A, B, and C.
Claim 17
Dependent Claim
20 words
A method of producing a heat resistant catalyst as defined in claim 13 wherein the alkoxides have 1-4 carbon atoms.
Claim 18
Dependent Claim
31 words
A method of producing a heat resistant catalyst as defined in claim 12, wherein the amount of water used for the hydrolysis is at least about 0.5 equivalent amount of water.
Claim 19
Dependent Claim
25 words
A method of producing a heat resistant catalyst as defined in claim 12, wherein the hydrolysis is effected at a temperature of about 50°-100° C.
Claim 20
Dependent Claim
32 words
A method of producing a heat resistant catalyst as defined in claim 12, wherein an aging is effected for at least about 1 hour after the addition of water for the hydrolysis.
Claim 21
Dependent Claim
32 words
A method of producing a heat resistant catalyst as defined in claim 12, wherein the element A is Ba, the element C is K, and the element B is Mn and/or Co.
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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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |