US3900429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for purifying exhaust gases
Assignee: Toyota Central R&D Labs Inc
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Filing: 1974-02-06
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Granted: 1975-08-19
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Expires: 1994-02-06
Abstract
Abstract A catalyst for purifying exhaust gases from internal combustion engines and the like which consists essentially of a particulate mixture of nickel particles and copper particles; nickel particles, copper particles and chromium particles; or nickel particles, copper particles, chromium particles and an oxide selected from the group consisting of yttrium oxide, titanium dioxide, lanthanum oxide and mixtures thereof, wherein said particulate mixture is sintered and at least partially oxidized.
Inventors
- 👤 Noboru Komatsu
- 👤 Osami Kamigaito
- 👤 Takatoshi Suzuki
- 👤 Haruo Doi
- 👤 Kazuya Sano
- 👤 Nobuyuki Yamamoto
- 👤 Toshio Kandori
- 👤 Yukikazu Tsuzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:07
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9459; B01D53/9477; B01J23/74; B01J23/755; B01D2255/00; B01D2255/20; B01D2255/206; B01D2255/2061; B01D2255/2063; B01D2255/207; B01D2255/20707; B01D2255/20753; B01D2255/20761; B01D2255/20784; B01D53/9404; B01D53/9409; B01D53/944; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
97 words
A CATALYST FOR PURIFYING EXHAUST GASES PRODUCED BY A PROCESS, WHICH COMPRISES THE STEPS OF: MIXING PARTICLES OF NICKEL AND COPPER, NICKEL, COPPER AND CHROMIUM OR NICKEL, COPPER, CHROMIUM AND AN OXIDE SELECTED FROM THE GROUP CONSISTING OF YTTRIUM OXIDE, TITANIUM OXIDE, LANTHANUM OXIDE AND MIXTURES THEREOF, SINTERING SAID PARTICLES AT A TEMPERATURE RANGING FROM 500* TO 1000*C IN AIR OR AN OXYGEN CONTAINING GAS WHICH RESULTS IN PARTIAL OXIDATION OF THE PARTICLES, AND ACTIVATING SAID SINTERED MIXTURE AT A TEMPERATURE RANGING FROM 500* TO 1000*C UNDER AN ATMOSPHERE OF A REDUCTIVE GAS OR A NON-OXIDIZING GAS.
Claim 2
Dependent Claim
97 words
A CATALYST FOR PURIFYING EXHAUST GASES PRODUCED BY A PROCESS, WHICH COMPRISES THE STEPS OF: MIXING PARTICLES OF NICKEL AND COPPER, NICKEL, COPPER AND CHROMIUM OR NICKEL, COPPER, CHROMIUM AND AN OXIDE SELECTED FROM THE GROUP CONSISTING OF YTTRIUM OXIDE, TITANIUM OXIDE, LANTHANUM OXIDE AND MIXTURES THEREOF, SINTERING SAID PARTICLES AT A TEMPERATURE RANGING FROM 500* TO 1000*C IN AIR OR AN OXYGEN CONTAINING GAS WHICH RESULTS IN PARTIAL OXIDATION OF THE PARTICLES, AND ACTIVATING SAID SINTERED MIXTURE AT A TEMPERATURE RANGING FROM 500* TO 1000*C UNDER AN ATMOSPHERE OF A REDUCTIVE GAS OR A NON-OXIDIZING GAS.
Claim 3
Dependent Claim
28 words
The catalyst of claim 1 wherein said particulate mixture consists of 50 to 95% by weight of nickel particles and 5 to 50% by weight of copper particles.
Claim 4
Dependent Claim
31 words
The catalyst of claim 1 wherein said particulate mixture consists of 50 to 95% by weight of nickel particles and chromium particles and 5 to 50% by weight of copper particles.
Claim 5
Dependent Claim
48 words
The catalysts of claim 1 wherein said particulate mixture consists of 95 to 99% by weight of nickel particles, copper particles and chromium particles and 1 to 5% by weight of an oxide selected from the group consisting of yttrium oxide, titanium dioxide, lanthanum oxide and mixtures thereof.
Claim 6
Dependent Claim
19 words
The catalyst of claim 1 wherein said catalyst is in the shape of beads, granules, pellets, plates or honeycombs.
Claim 7
Dependent Claim
18 words
The catalyst of claim 1, wherein the diameter of said particles ranges from 2 Mu to 2 mm.
Claim 8
Dependent Claim
18 words
The catalyst according to claim 1, wherein said sintered catalyst has a porosity of about 20 to 40%.
Claim 9
Independent Claim
106 words
A method for preparing a catalyst for purifying exhaust gases from internal combustion engines and the like, which comprises the steps of: mixing particles of nickel and copper; nickel, copper and chromium or nickel, copper, chromium and an oxide selected from the group consisting of yttrium oxide, titanium oxide, lanthanum oxide and mixtures thereof; sintering said particulate mixture at a temperature ranging from 500* to 1000*C in air or an oxygen containing gas which results in the partial oxidation of said particles; and activating said sintered mixture at a temperature ranging from 500* to 1000*C under an atmosphere of a reductive gas or a non-oxidizing gas.
Claim 10
Independent Claim
106 words
A method for preparing a catalyst for purifying exhaust gases from internal combustion engines and the like, which comprises the steps of: mixing particles of nickel and copper; nickel, copper and chromium or nickel, copper, chromium and an oxide selected from the group consisting of yttrium oxide, titanium oxide, lanthanum oxide and mixtures thereof; sintering said particulate mixture at a temperature ranging from 500* to 1000*C in air or an oxygen containing gas which results in the partial oxidation of said particles; and activating said sintered mixture at a temperature ranging from 500* to 1000*C under an atmosphere of a reductive gas or a non-oxidizing gas.
Claim 11
Dependent Claim
16 words
The method of claim 8, wherein said sintered mixture is activated for 1 to 2 hours.
Claim 12
Dependent Claim
89 words
A catalyst for purifying exhaust gases produced by a process, which comprises the steps of: mixing particles of nickel and copper; nickel, copper and chromium or nickel; copper, chromium and an oxide selected from the group consisting of yttrium oxide, titanium oxide, lanthanum oxide and mixtures thereof; sintering said particles in a non-oxidizing atmosphere; oxidizing said sintered particles in air or an oxygen containing gas; and activating said sintered mixture at a temperature ranging from 500* to 1000*C under an atmosphere of a reductive gas or a non-oxidizing gas.
Claim 13
Dependent Claim
89 words
A catalyst for purifying exhaust gases produced by a process, which comprises the steps of: mixing particles of nickel and copper; nickel, copper and chromium or nickel; copper, chromium and an oxide selected from the group consisting of yttrium oxide, titanium oxide, lanthanum oxide and mixtures thereof; sintering said particles in a non-oxidizing atmosphere; oxidizing said sintered particles in air or an oxygen containing gas; and activating said sintered mixture at a temperature ranging from 500* to 1000*C under an atmosphere of a reductive gas or a non-oxidizing gas.
Claim 14
Dependent Claim
28 words
The catalyst of claim 10, wherein said particulate mixture consists of 50 to 95% by weight of nickel particles and 5 to 50% by weight of copper particles.
Claim 15
Dependent Claim
31 words
The catalyst of claim 10, wherein said particulate mixture consists of 50 to 95% by weight of nickel particles and chromium particles and 5 to 50% by weight of copper particles.
Claim 16
Dependent Claim
48 words
The catalyst of claim 10, wherein said particulate mixture consists of 95 to 99% by weight of nickel particles, copper particles and chromium particles and 1 to 5% by weight of an oxide selected from the group consisting of yttrium oxide, titanium dioxide, lanthanum oxide and mixtures thereof.
Claim 17
Dependent Claim
19 words
The catalyst of claim 10, wherein said catalyst is in the shape of beads, granules, pellets, plates or honeycombs.
Claim 18
Dependent Claim
17 words
The catalyst of claim 10, wherein said sintered catalyst has a porosity of about 20 to 40%.
Claim 19
Dependent Claim
18 words
The catalyst of claim 10, wherein the diameter of said particles range from 2 Mu to 2 mm.
Claim 20
Independent Claim
103 words
A method for preparing a catalyst for purifying exhaust gases from internal combustion engines and the like, which comprises the steps of: mixing particles of nickel and copper; nickel, copper and chromium or nickel, copper, chromium and an oxide selected from the group consisting of yttrium oxide, titanium oxide, lanthanum oxide and mixtures thereof; sintering said particulate mixture at a temperature ranging from 500* to 1000*C in a non-oxidizing atmosphere; oxidizing said sintered particles in air or an oxygen-containing gas; activating said sintered mixture at a temperature ranging from 500* to 1000*C under an atmosphere of a reductive gas or a non-oxidizing gas.
Claim 21
Independent Claim
103 words
A method for preparing a catalyst for purifying exhaust gases from internal combustion engines and the like, which comprises the steps of: mixing particles of nickel and copper; nickel, copper and chromium or nickel, copper, chromium and an oxide selected from the group consisting of yttrium oxide, titanium oxide, lanthanum oxide and mixtures thereof; sintering said particulate mixture at a temperature ranging from 500* to 1000*C in a non-oxidizing atmosphere; oxidizing said sintered particles in air or an oxygen-containing gas; activating said sintered mixture at a temperature ranging from 500* to 1000*C under an atmosphere of a reductive gas or a non-oxidizing gas.
Claim 22
Dependent Claim
23 words
The method of claim 17, wherein said sintered mixture is activated at a temperature of 500* to 1000*C for 1 to 2 hours.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |