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US4959339A
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Heat-resistant noble metal catalyst and method of producing the same
Assignee: Toshiba Corp
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Filing: 1989-04-11
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Granted: 1990-09-25
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Expires: 2009-04-11
Abstract
Abstract A heat-resistant noble metal catalyst having both of exceedingly superior heat-resistant property and a remarkable high activity at any temperature ranges of low, middle, and high, is provided having a heat-reistant noble metal catalyst consisting essentially of a composition having a formula A 1-z C z B x D u Al 12-y-u O 19- α, wherein A is at least one element selected from the group consisting of Ba, Ca and Sr, C is at least one element selected from the group consisting of K, Rb and rare earth elements, B is at least one element selected from the group consisting of Mn, Co, Fe, Ni, Cu and Cr, D is at least one element selected from the group consisting of Au, Ag and platinum group noble metals, z is a value in a range of 0-about 0.4, x is a value in a range of 0-about 4, y is a value in a range of x-2x, u is a value of not less than about 0.01, x+u is a value of not more than about 4, and α is a value which is determined by the values X, Y, Z and U of the respective elements, A, C, B and D and the values of x, y, z and u and is expressed as α=1-1/2{X-z(X-Y)+xZ+uU-3y-3u}. A method of producing such a catalyst is also provided.
Inventors
- 👤 Hiromichi Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:27
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/63; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J23/58; B01J23/64; B01J23/66; B01J23/70; B01J23/89; B01J23/8933; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
187 words
A heat-resistant noble metal catalyst consisting essentially of a composition having a formula A 1-z C z B x D u Al 12-y-u O 19- α, wherein A is at least one element selected from the group consisting of Ba, Ca and Sr, C is at least one element selected from the group consisting of K, Rb and rare earth elements, B is at least one element selected from the group consisting of Mn, Co, Fe, Ni, Cu and Cr, D is at least one element selected from the group consisting of Au, Ag and platinum group noble metals, z is a value in a range of 0-about 0.4, x is a value in a range of 0-about 4, y is a value in a range of x-2x, u is a value of not less than about 0.01, x+u is a value of not more than about 4, and α is a value which is determined by the valences X, Y, Z and U of the respective element A, C, B and D and the values of x, y, z and u and is expressed as α=1-1/2{X-z(X-Y)+xZ+uU-3y-3u}.
Claim 2
Dependent Claim
187 words
A heat-resistant noble metal catalyst consisting essentially of a composition having a formula A 1-z C z B x D u Al 12-y-u O 19- α, wherein A is at least one element selected from the group consisting of Ba, Ca and Sr, C is at least one element selected from the group consisting of K, Rb and rare earth elements, B is at least one element selected from the group consisting of Mn, Co, Fe, Ni, Cu and Cr, D is at least one element selected from the group consisting of Au, Ag and platinum group noble metals, z is a value in a range of 0-about 0.4, x is a value in a range of 0-about 4, y is a value in a range of x-2x, u is a value of not less than about 0.01, x+u is a value of not more than about 4, and α is a value which is determined by the valences X, Y, Z and U of the respective element A, C, B and D and the values of x, y, z and u and is expressed as α=1-1/2{X-z(X-Y)+xZ+uU-3y-3u}.
Claim 3
Dependent Claim
38 words
A heat-resistant noble metal catalyst as defined in claim 1, wherein the atomic ratio of the sum of elements A and C to the sum of elements B, D and Al is in a range of about (7-10):100.
Claim 4
Dependent Claim
54 words
A heat-resistant noble metal catalyst as defined in claim 1, wherein a part or whole of the Al or a part or whole of the elements A and Al in the composition A 1-z C z B x D u Al 12-y-u O 19- α is a decomposition product of alkoxides of these elements.
Claim 5
Dependent Claim
28 words
A heat-resistant noble metal catalyst as defined in claim 3, wherein the decomposition product of the alkoxides is a hydrolysis product or heat decomposition product of the alkoxides.
Claim 6
Dependent Claim
17 words
A heat-resistant noble metal catalyst as defined in claim 3, wherein the alkoxides have 1-4 carbon atoms.
Claim 7
Dependent Claim
59 words
A heat-resistant noble metal catalyst as defined in claim 1, wherein a part or whole of the composition having the formula A 1-z C z B x D u Al 12-y-u O 19- α is a layered aluminate crystal structure in which active elements B and D are incorporated and fixed in a crystal lattice of the crystal structure.
Claim 8
Dependent Claim
21 words
A heat-resistant noble metal catalyst as defined in claim 1, which is used as a catalyst in a catalytic combustion process.
Claim 9
Independent Claim
151 words
A method of producing a heat-resistant noble metal catalyst comprising dissolving and mixing a water soluble and/or alcohol soluble aluminum compound, a water soluble and/or alcohol soluble compound of an element A selected from the group consisting of Ca, Ba and Sr, a water soluble and/or alcohol soluble compound of an element C selected from the group consisting of K, Rb and rare earth elements, a water soluble and/or alcohol soluble compound of an element B selected from the group consisting of Mn, Co, Fe, Ni, Cu and Cr, and a water soluble and/or alcohol soluble compound of an element D selected from the group consisting of Au, Ag and platinum group noble metals in an atomic ratio of (Al+B+D):(A+C):(B+D):B=100:(7-10):(0.08-33.3):(0-33.2), obtaining a precipitation, hydrolysis and/or thermal decomposition product in the solution, removing the product from the solution, and calcining the product at a temperature of not less than about 900° C.
Claim 10
Independent Claim
151 words
A method of producing a heat-resistant noble metal catalyst comprising dissolving and mixing a water soluble and/or alcohol soluble aluminum compound, a water soluble and/or alcohol soluble compound of an element A selected from the group consisting of Ca, Ba and Sr, a water soluble and/or alcohol soluble compound of an element C selected from the group consisting of K, Rb and rare earth elements, a water soluble and/or alcohol soluble compound of an element B selected from the group consisting of Mn, Co, Fe, Ni, Cu and Cr, and a water soluble and/or alcohol soluble compound of an element D selected from the group consisting of Au, Ag and platinum group noble metals in an atomic ratio of (Al+B+D):(A+C):(B+D):B=100:(7-10):(0.08-33.3):(0-33.2), obtaining a precipitation, hydrolysis and/or thermal decomposition product in the solution, removing the product from the solution, and calcining the product at a temperature of not less than about 900° C.
Claim 11
Dependent Claim
46 words
A method of producing the catalyst as defined in claim 8, wherein the hydrolysis product is obtained by hydrolysis of complexed and/or mixed alkoxides of aluminum alkoxide and alkoxide of the element A using an aqueous solution of compounds of the elements C, B and D.
Claim 12
Dependent Claim
36 words
A method of producing the catalyst as defined in claim 8, wherein the hydrolysis product is obtained by hydrolysis of aluminum alkoxide using an aqueous solution of compounds of the elements A, C, B and D.
Claim 13
Dependent Claim
18 words
A method of producing the catalyst as defined in claim 8, wherein the alkoxides have 1-4 carbon atoms.
Claim 14
Dependent Claim
38 words
A method of producing the catalyst as defined in claim 8, wherein the amount of water used for the hydrolysis is at least about 0.5 equivalent amount of water necessary for hydrolyzing all the amounts of the alkoxides.
Claim 15
Dependent Claim
23 words
A method of producing the catalyst as defined in claim 8, wherein the hydrolysis is effected at a temperature of about 50°-100° C.
Claim 16
Dependent Claim
30 words
A method of producing the catalyst as defined in claim 8, wherein an aging is effected for at least about 1 hr after the addition of water for the hydrolysis.
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