US3787322A
Expired / Lapsed
US
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Catalyst for purification of exhaust gases from motor vehicles and industrial plants
Assignee: DEUTSCHE GOLD und SILBER SCHEIDEANSTALT DT
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Filing: 1971-01-25
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Granted: 1974-01-22
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Expires: 1991-01-25
Abstract
Abstract This invention provides a catalyst composition for use in oxidative reactions at high temperatures e.g., the oxidation of exhaust gases from internal combustion engines, which catalyst comprises an at least substantially homogeneous mixture of aluinium oxide of cubic structure (i.e., of the gamma series) oxide of copper and chromium, and optionally at least one compound of at least one other element of Group IIa of the Periodic Table, the proportion of the aluminium xoide being from 20 percent to 45 percent by weight of total catalyst weight, together with said at least one other compound, expressed as oxide, the mole ratio of copper oxide to chromium oxide in the oxide of copper and chromium, expressed as CuO:Cr2O3, being from 1.2:1 to 2.2:1, and the majority of oxide of copper and chromium being of a size of from 0.5 to 5 Mu . The invention also provides a process for making such a catalyst.
Inventors
- 👤 E Koberstein
- 👤 E Lakatos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
263 words
calcined powdered oxide of copper and chromium selected from the group consisting of i. copper oxide in physical admixture with chromium oxide, and ii. copper oxide chemically combined with chromium oxide, the mole ratio of copper oxide to chromium oxide being from 1.2 to 2.2:1 and the particle size of the majority of the oxide of copper and chromium being in the range of 0.5 microns to 5.0 microns, b. forming a moist mixture selected from the group consisting of i. a mixture of said aluminium oxide and said oxide of copper and chromium, the aluminium oxide being present in from 20 to 45 percent of the total weight of aluminium oxide and oxide of copper and chromium, and ii. a mixture of said aluminium oxide, said oxide of copper and chromium and at least one other compound the other compound being selected from the group consisting of i. oxides, chromites and chromates of beryllium, ii. oxides, chromites and chromates of magnesium, iii. oxides, chromites and chromates of calcium, iv. oxides, chromites and chromates of strontium, and v. oxides, chromites and chromates of barium, the aluminium oxide being present in from 20 to 45 percent of the total weight of aluminium oxide, oxide of copper and chromium and said other compound expressed as the oxide, and said other compound expressed as the oxide being present in not more than 5 percent by weight of said copper and chromium, c. drying the mixture, d. moulding the dried mixture, and e. calcining the resulting moulded product at a temperature of from 700* to 1,000* C.
Claim 2
Dependent Claim
44 words
A process as claimed in claim 1 wherein the mixture of aluminium oxide and oxide of copper and chromium also contains said at least one other compound and said other compound is selected from the group consisting of oxide, chromite and chromate of barium.
Claim 3
Dependent Claim
90 words
a mixture of said aluminum oxide, said oxide of copper and chromium and at least one other compound , the other compound being selected from a group consisting of i. oxides, chromites and chromates of beryllium, ii. oxides, chromites and chromates of magnesium, iii. oxides, chromites and chromates of calcium, iv. oxides, chromites and chromates of strontium and v. oxides, chromites and chromates of barium, C. drying the mixture, and D. molding the dried mixture, E. calcining the resulting molded product at a temperature of from 700* to 1,000* C.
Claim 4
Dependent Claim
46 words
said oxide of copper and chromium in calcined powdered form and selected from the group consisting of i. copper oxide in physical admixture with chromium oxide, and, ii. copper oxide chemically combined with chromium oxide, B. forming a moist mixture selected from the group consisting of
Claim 5
Dependent Claim
32 words
A process as claimed in claim 2 wherein said other compound is barium oxide and the mole ratio of copper, to chromium to barium, expressed oxides, is 1.2 to 2.2:1:0.01 to 0.1.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 1 wherein aluminium oxide is present in the mixture in from 20 to 40 percent by weight.
Claim 7
Dependent Claim
39 words
A process as claimed in claim 1 wherein the dried mixture is ground into particle sizes below 100 microns and is treated with an acid selected from the group consisting of mineral acids and aliphatic carboxylic acids before calcination.
Claim 8
Dependent Claim
35 words
A process as claimed in claim 5 wherein the ground composition is treated with an acid selected from the group consisting of nitric acid, hydrochloric acid, sulphuric acid, acetic acid, citric acid and propionic acid.
Claim 9
Dependent Claim
44 words
A process as claimed in claim 5, wherein the quantity of acid is from 5 - 100 ml/1 kg of ground product, when using a concentrated mineral acid, and 50 - 300 ml/1 kg of ground product, when using a concentrated aliphatic carboxylic acid.
Claim 10
Dependent Claim
17 words
A process as in claim 1 wherein the aluminium oxide comprises an aluminium oxide hydrate press cake.
Claim 11
Dependent Claim
36 words
A process as in claim 1 wherein the said other compound is mixed with the oxide of copper and chromium before the mixture of the oxide of copper and chromium and the aluminium oxide is formed.
Claim 12
Dependent Claim
248 words
A process for preparing a catalyst composition which comprises the sequential steps of separately producing an aluminium oxide hydrate press cake and calcined powdered oxide of copper and chromium selected from the group consisting of copper oxide in a physical mixture with chromium oxide and copper oxide chemically combined with chromium oxide, the particle size of the majority of the oxide of copper and chromium being in the range of 0.5 microns to 5.0 microns, the mixture of and the oxide of copper and chromium contains at least one other compound selected from the group consisting of oxides, chromites and chromates of beryllium, magnesium, calcium, strontium and barium, the quantity of said other compound expressed as the oxide being from 0.5 to 5.0 percent by weight of the oxide of copper and chromium and mole ratio of copper oxide to chromium oxide being from 1.2 to 2.2:1, mixing the aluminium oxide hydrate and the oxide of copper and chromium containing said other compound, the aluminium oxide hydrate expressed as Al2O 3 being present in from 20 to 45 percent by weight of the aluminium oxide, oxide of copper and chromium and said other compound expressed as the oxide, drying the mixture, grinding the mixture into particle sizes below 100 Mu treating the ground mixture with an acid selected from the group consisting of mineral acids and aliphatic carboxylic acids, moulding the acid treated mixture and calcining it at a temperature in the range of 700* to 1,000* C.
Claim 13
Dependent Claim
26 words
A process as claimed in claim 10 wherein the said other compound is selected from the group consisting of the oxides, chromites and chromates of barium.
Claim 14
Dependent Claim
34 words
A process as claimed in claim 11 wherein the said other compound is barium oxide and the mole ratio of copper to chromium to barium expressed as oxides is 1.2 to 2.2:1:0.01 to 0.1.
Claim 15
Dependent Claim
37 words
A process as claimed in claim 10 wherein the ground mixture is treated with an acid selected from the group consisting of hydrochloric acid, sulphuric acid, nitric acid, lactic acid, acetic acid, citric acid and propionic acid.
Claim 16
Dependent Claim
45 words
A process as claimed in claim 5, wherein the quantity of acid may be from 5 - 100 ml/1 kg of ground product, when using a concentrated mineral acid, and 50 - 300 ml/1 kg of ground product, when using a concentrated aliphatic carboxylic acid.
Claim 17
Dependent Claim
234 words
An oxidation catalyst for use in the purification of exhaust gases issuing from motor vehicles and industrial plants consisting essentially of moldings of a mixture selected from the group consisting of: a. A mixture of aluminum oxide and an oxide of copper and chromium, the aluminum oxide being present in from 20 to 45 percent of the total weight of aluminum oxide and oxides of copper and chromium, and b. A mixture of aluminum oxide, an oxide of copper and chromium and at least one other compound, the other compound being selected from the group consisting of: i. Oxides, chromites and chromates of beryllium, ii. Oxides, chromites and chromates of magnesium, iii. Oxides, chromites and chromates of calcium, iv. Oxides, chromites and chromates of strontium, v. Oxides, chromites and chromates of barium, wherein the aluminum oxide is present in from 20 to 45 percent of the total weight of aluminum oxide, oxide of copper and chromium and said other compound expressed as the oxide, and said other compound expressed as an oxide being present in not more than 5 percent by weight of said copper and chromium, the mole ratio of copper oxide to chromium oxide being from 1.2 to 2.2:1 and the particle size of the majority of the oxide of copper and chromium being in the range of 0.5 microns to 5.0 microns said moldings having been formed by A. separately producing
Claim 18
Dependent Claim
18 words
A catalyst composition as claimed in claim 15 wherein said at least one other compound is barium oxide.
Claim 19
Dependent Claim
26 words
A catalyst composition according to claim 15 wherein the molar ratio of copper to chromium to barium expressed as oxides is 1.2 to 2.2:1:0.01 to 0.1.
Claim 20
Dependent Claim
38 words
A catalyst composition according to claim 15 wherein the aluminum oxide is present in from 20 to 40 percent of the weight of aluminium oxide, aluminium of copper and chromium and said other compound expressed as the oxide.
References Cited (Backward Citations)
US2204619A
Cited
US2499675A
Cited
US2985596A
Cited
US2963448A
Cited
US2937490A
Cited
US2952644A
Cited
US3072458A
Cited
US3317439A
Cited
US3271324A
Cited
US3291564A
Cited
US3362783A
Cited
US3532457A
Cited
US3669906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |