US3893949A
Expired / Lapsed
US
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Catalysts for use in conversion of gases and methods of manufacturing them
Assignee: Mitsui Kinzoku Co Ltd
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Filing: 1972-07-26
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Granted: 1975-07-08
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Expires: 1992-07-26
Abstract
Abstract Catalysts for use in conversion of gases containing carbon monoxide and/or hydrocarbons such as waste gases arising from automobiles and the like, which are characterized by containing particles of catalytic metal oxide(s) such as copper oxide(s), iron oxide(s), chromium oxide(s), nickel oxide(s), cobalt oxide(s), zinc oxide, lead oxide(s), bismuth oxide(s), etc. effective for oxidizing carbon monoxide, hydrocarbons, and the like and plated with such metal(s) as copper, iron, nickel, cobalt, chromium, tin, silver, etc. by such means as electroless plating, electroplating, etc.; and relevant methods of manufacturing these catalysts. relevant methods of manufacturing these catalysts.
Inventors
- 👤 Toshiyuki Sakai
- 👤 Kazuhide Miyazaki
- 👤 Yutaka Ushimaru
- 👤 Michiaki Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:23
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/34; B01J37/348; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J37/02; B01J37/03; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
133 words
A METHOD FOR MANUFACTURING A CATALYST COMPOSITION FOR OXIDIZING A GAS, WHICH COMPRISES EFFECTING AN ELECTROLESS PLATING OF CATALYTIC OXIDE SELECTED FROM THE GROUP CONSISTING OF MANGANESE OXIDE, COPPER OXIDE, IRON OXIDE, CHROMIUM OXIDE NICKEL OXIDE, COBALT OXIDE, BISMUTH OXIDE, ZINC OXIDE, LEAD OXIDE, COMPOUNDS CONTAINING AT LEAST ONE OF SAID OXIDES AND MIXTURES OF SAID OXIDES BY SENSITIZING SAME WITH AN AQUEOUS SOLUTION OF STANNOUS CHLORIDE, THEN ACTIVATING SAME WITH AN AQUEOUS SOLUTION OF A NOBLE METAL SALT AND THEN TREATING SAME WITH AN ELECTROLESS PLATING BATH TO DEPOSIT ON THE CATALYTIC OXIDE FROM 0.1 TO 10% BY WEIGHT, BASED ON THE WEIGHT OF CATALYTIC OXIDE, OF METAL CAPABLE OF PROMOTING THE CATALYTIC EFFECT OF SAID CATALYTIC OXIDE SELECTED FROM THE GROUP CONSISTING OF CU, FE, NI, CO, CR, SN AND AG.
Claim 2
Independent Claim
133 words
A METHOD FOR MANUFACTURING A CATALYST COMPOSITION FOR OXIDIZING A GAS, WHICH COMPRISES EFFECTING AN ELECTROLESS PLATING OF CATALYTIC OXIDE SELECTED FROM THE GROUP CONSISTING OF MANGANESE OXIDE, COPPER OXIDE, IRON OXIDE, CHROMIUM OXIDE NICKEL OXIDE, COBALT OXIDE, BISMUTH OXIDE, ZINC OXIDE, LEAD OXIDE, COMPOUNDS CONTAINING AT LEAST ONE OF SAID OXIDES AND MIXTURES OF SAID OXIDES BY SENSITIZING SAME WITH AN AQUEOUS SOLUTION OF STANNOUS CHLORIDE, THEN ACTIVATING SAME WITH AN AQUEOUS SOLUTION OF A NOBLE METAL SALT AND THEN TREATING SAME WITH AN ELECTROLESS PLATING BATH TO DEPOSIT ON THE CATALYTIC OXIDE FROM 0.1 TO 10% BY WEIGHT, BASED ON THE WEIGHT OF CATALYTIC OXIDE, OF METAL CAPABLE OF PROMOTING THE CATALYTIC EFFECT OF SAID CATALYTIC OXIDE SELECTED FROM THE GROUP CONSISTING OF CU, FE, NI, CO, CR, SN AND AG.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the catalytic oxide composition is formed into a molded catalytic shape.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein the forming step is carried out prior to plating the catalytic oxide.
Claim 5
Dependent Claim
27 words
The method of claIm 1 wherein the catalytic oxide is mixed with a finely divided oxide promoter selected from the group consisting of alumina, silica and magnesia.
Claim 6
Dependent Claim
22 words
The method of claim 4 wherein the step of admixture with said oxide promoter is carried out prior to said plating step.
Claim 7
Dependent Claim
22 words
The method of claim 4 wherein the step of admixture with said oxide promoter is carried out subsequent to said plating step.
Claim 8
Dependent Claim
17 words
The method of claim 7 wherein said plated catalytic oxide is admixed with said unplated catalytic oxide.
Claim 9
Dependent Claim
45 words
The method of claim 1 wherein said catalytic oxide or a mixture of said catalytic oxide with an oxide promoter selected from the group consisting of alumina, silica and magnesia is subjected to compacting molding and the resulting molded shape is subjected to electroless plating.
Claim 10
Independent Claim
211 words
A method for manufacturing a catalyst composition for oxidizing a gas, which comprises: molding a mixture comprising (A) particles of electrically conductive catalytic oxide selected from the group consisting of manganese oxide, copper oxide, iron oxide, chromium oxide, nickel oxide, cobalt oxide, bismuth oxide, zinc oxide, lead oxide, compounds containing at least one of said oxides and mixtures of said oxides, and (B) particles of a first metal, to form a molded catalyst element, immersing said molded catalyst element in an aqueous solution of a water soluble salt of a second metal which is electrochemically more noble than the first metal and which is effective to promote the catalytic effect of said catalytic oxide, said second metal being selected from the group consisting of Cu, Fe, Ni, Co, Cr, Sn and Ag, the immersing step being carried out in the absence of supplying electrical energy to said solution from an external source and so that said first metal serves as the anode and the electrically conductive catalytic oxide serves as the cathode in said solution, the immersing step being carried out for a period of time effective to deposit electrochemically on said catalytic oxide from 0.1 to 10% by weight, based on the weight of catalytic oxide, of said second metal.
Claim 11
Independent Claim
211 words
A method for manufacturing a catalyst composition for oxidizing a gas, which comprises: molding a mixture comprising (A) particles of electrically conductive catalytic oxide selected from the group consisting of manganese oxide, copper oxide, iron oxide, chromium oxide, nickel oxide, cobalt oxide, bismuth oxide, zinc oxide, lead oxide, compounds containing at least one of said oxides and mixtures of said oxides, and (B) particles of a first metal, to form a molded catalyst element, immersing said molded catalyst element in an aqueous solution of a water soluble salt of a second metal which is electrochemically more noble than the first metal and which is effective to promote the catalytic effect of said catalytic oxide, said second metal being selected from the group consisting of Cu, Fe, Ni, Co, Cr, Sn and Ag, the immersing step being carried out in the absence of supplying electrical energy to said solution from an external source and so that said first metal serves as the anode and the electrically conductive catalytic oxide serves as the cathode in said solution, the immersing step being carried out for a period of time effective to deposit electrochemically on said catalytic oxide from 0.1 to 10% by weight, based on the weight of catalytic oxide, of said second metal.
Claim 12
Dependent Claim
38 words
A method according to claim 9, in which said catalytic oxide is selected from the group consisting of manganese dioxide, manganese sesquioxide, cuprous oxide, lead peroxide, zinc oxide and magnetite and said first metal is Fe or Zn.
Claim 13
Dependent Claim
26 words
A method according to claim 9, wherein said mixture also contains (C) particles of a promoter selected from the group consisting of alumina, silica and magnesia.
Claim 14
Independent Claim
153 words
A method for manufacturing a catalyst composition for oxidizing a gas, which comprises: molding particles of electrically conductive catalytic oxide selected from the group consisting of manganese oxide, copper oxide, iron oxide, chromium oxide, nickel oxide, covalt oxide, bismuth oxide, zinc oxide, lead oxide, compounds containing at least one of said oxides and mixtures of said oxides, to form a molded catalyst element, immersing said molded catalyst element in an aqueous electrolyte solution of a salt of a metal which is effective to promote the catalytic effect of said catalytic oxide, said metal being selected from the group consisting of Cu, Fe, Ni, Co, Cr, Sn and Ag, and applying direct current to effect electrolysis employing said catalytic oxide as cathode, for a period of time effective to deposit said metal on said catalytic oxide in an amount of from 0.1 to 10% by weight, based on the weight of said catalytic oxide.
Claim 15
Independent Claim
153 words
A method for manufacturing a catalyst composition for oxidizing a gas, which comprises: molding particles of electrically conductive catalytic oxide selected from the group consisting of manganese oxide, copper oxide, iron oxide, chromium oxide, nickel oxide, covalt oxide, bismuth oxide, zinc oxide, lead oxide, compounds containing at least one of said oxides and mixtures of said oxides, to form a molded catalyst element, immersing said molded catalyst element in an aqueous electrolyte solution of a salt of a metal which is effective to promote the catalytic effect of said catalytic oxide, said metal being selected from the group consisting of Cu, Fe, Ni, Co, Cr, Sn and Ag, and applying direct current to effect electrolysis employing said catalytic oxide as cathode, for a period of time effective to deposit said metal on said catalytic oxide in an amount of from 0.1 to 10% by weight, based on the weight of said catalytic oxide.
Claim 16
Dependent Claim
30 words
A method according to claim 12, in which said catalytic oxide is selected from the group consisting of manganese dioxide, manganese sesquioxide, cuprous oxide, lead peroxide, zinc oxide and magnetite.
Claim 17
Dependent Claim
37 words
A method according to claim 12, wherein the catalytic oxide particles are mixed with particles of a promoter selected from the group consisting of alumina, silica and magnesia and that mixture is subjected to said molding step.
Claim 18
Dependent Claim
10 words
A catalyst composition made by the process of claiM 1.
Claim 19
Dependent Claim
10 words
A catalyst composition made by the process of claim 5.
Claim 20
Dependent Claim
10 words
A catalyt composition made by the process of claim 8.
Claim 21
Dependent Claim
10 words
A catalyst composition made by the process of claim 9.
Claim 22
Dependent Claim
10 words
A catalyst composition made by the process of claim 12.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |