EP0306945A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Oxidation of carbon monoxide and catalyst therefor
Assignee: Phillips Petroleum Co
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Filing: 1988-09-08
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Granted: —
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Expires: 2008-09-08
Abstract
Abstract A composition of matter comprising titania and Pt and/or Pd is prepared by a process comprising one step of heating Pt and/or Pd-impregnated titania with a reducing gas, in particular free hydrogen, at a temperature of about 300-800°C. Another composition of matter comprising titania and Pt and/or Pd is prepared by a process comprising the steps of coating a porous ceramic material (preferably a monolith) with colloidal TiO₂, drying, impregnation with Pt and/or Pd, drying/calcining, and reducing with a reducing gas, in particular free hydrogen, at a temperature of about 0-300°C. Both compositions of matter are used as a catalyst in a process for oxidizing CO to CO₂, e.g., in a CO₂ laser.
Inventors
- 👤 John Henry Kolts
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:18
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/036; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/54; B01J23/56; B01J23/70; B01J23/89
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
187 words
A process for preparing a composition of matter, from which silica is substantially absent, which is useful and effective as a catalyst composition for CO oxidation, and which comprises titania and at least one noble metal selected from the group consisting of platinum and palladium, comprising the steps of: (a) contacting a support material, from which silica is substantially absent, comprising titania with a solution comprising at least one dissolved compound of at least one noble metal selected from the group consisting of platinum and palladium; (b) heating the material obtained in step (a) under such conditions as to substantially dry said material obtained in step (a) and to at least partially convert said at least one compound of at least one noble metal to at least one of oxides of Pt, oxides of Pd, Pt metal and Pd metal; and (c) heating the material obtained in step (b) in a reducing gas atmosphere at a room temperature in the range of from about 300 to about 800°C, under such conditions as to activate said material obtained in step (b) and to form said composition of matter.
Claim 2
Dependent Claim
187 words
A process for preparing a composition of matter, from which silica is substantially absent, which is useful and effective as a catalyst composition for CO oxidation, and which comprises titania and at least one noble metal selected from the group consisting of platinum and palladium, comprising the steps of: (a) contacting a support material, from which silica is substantially absent, comprising titania with a solution comprising at least one dissolved compound of at least one noble metal selected from the group consisting of platinum and palladium; (b) heating the material obtained in step (a) under such conditions as to substantially dry said material obtained in step (a) and to at least partially convert said at least one compound of at least one noble metal to at least one of oxides of Pt, oxides of Pd, Pt metal and Pd metal; and (c) heating the material obtained in step (b) in a reducing gas atmosphere at a room temperature in the range of from about 300 to about 800°C, under such conditions as to activate said material obtained in step (b) and to form said composition of matter.
Claim 3
Dependent Claim
18 words
A process in accordance with claim 1, wherein said reducing gas atmosphere is a free hydrogen containing gas.
Claim 4
Dependent Claim
100 words
A process in accordance with claims 1 or 2, wherein step (b) is carried out in two sub-steps; (b1) heating the metal obtained in step (a) at a first temperature so as to remove substantially all liquids from said material obtained in step (a), and (b2) heating the substantially dried material obtained in step (b1) at a second temperature, which is higher than said first temperature, so as to at least partially convert said at least one compound of at least one noble metal to at least one of oxides of Pt, oxides of Pd, metallic Pt and metallic Pd.
Claim 5
Dependent Claim
37 words
A process in accordance with claim 3, wherein said first temperature is in the range of from about 30 to about 200°C, and said second temperature is in the range of from about 300 to about 700°C.
Claim 6
Dependent Claim
53 words
A process in accordance with any of the preceding claims wherein said composition of matter comprises Pt as noble metal and additionally at least one copromoter selected from the group consisting of rhenium oxide, iron oxide, ruthenium metal, ruthenium oxide, copper metal, copper oxide, silver metal, silver oxide, samarium oxide and europium oxide.
Claim 7
Dependent Claim
81 words
A process in accordance with any of the preceding claims wherein said solution used in step (a) comprises at least one compound of Pt and at least one compound of at least one copromoter metal selected from the group consisting of Re, Fe, Ru, Cu, Ag, Sm and Eu, and said at least one compound of at least one copromoter metal is at least partially converted to at least one oxide of said at least one copromoter metal in step (b).
Claim 8
Dependent Claim
141 words
A process in accordance with any of the claims 1-5 further comprising the additional steps of: (a*) impregnating the material obtained in step (b) with a solution comprising at least one compound of at least one copromoter metal selected form the group consisting of Re, Fe, Ru, Cu, Ag, Sm and Eu, wherein said material obtained in step (b) comprises at least one substance selected from the group consisting of Pt metal and oxide of Pt; and (b*) heating the material obtained in step (a*) under such conditions as the substantially dry said material obtained in step (A*) and to at least partially convert said at least one compound of at least one copromoter metal to at least one oxide of said at least one copromoter metal; and wherein step (c) is carried out with the material obtained in step (b*).
Claim 9
Dependent Claim
29 words
A process in accordance with any of the preceding claims, wherein compounds of chromium, compounds of maganese and compounds of zinc are substantially absent in said composition of matter.
Claim 10
Dependent Claim
26 words
A process in accordance with claim 5, wherein said composition of matter contains about 0.2 to about 4 weight percent of said copromoter, expressed as metal.
Claim 11
Dependent Claim
50 words
A process in accordance with any of the preceding claims, wherein step (c) is carried out in a stream of H₂ at a temperature in the range of from about 350 to about 500°C, for a period of time in the range of from about 0.5 to about 20 hours.
Claim 12
Dependent Claim
24 words
A process in accordance with any of the preceding claims, wherein said catalyst composition comprises from about 0.5 to about 5 weight percent Pt.
Claim 13
Dependent Claim
25 words
A process in accordance with any of the preceding claims, wherein said composition of matter comprises from about 0.5 to about 5 weight percent Pd.
Claim 14
Dependent Claim
32 words
A process in accordance with any of the preceding claims wherein said support material is used in step (a) has been extracted with an aqueous acidic solution, thereafter washed, dried and calcined.
Claim 15
Dependent Claim
121 words
A process in accordance with any of the claims 1 to 8, wherein said support material used in step (a) has been prepared by: (A) impregnating a porous ceramic material with a colloidal dispersion of titania in a suitable liquid dispersion medium, wherein dispersed silica is substantially absent in said colloidal dispersion; (B) heating the titania-coated material obtained in step (A) so as to obtain a substantially dried titania-coated porous ceramic material; and wherein said heating material obtained in step (c) in a reducing gas atmosphere is carried out at a temperature in the range of from about 0 to about 300°C under such conditions as to activate said material obtained in step (b) and to form said composition of matter.
Claim 16
Dependent Claim
47 words
A process in accordance with claim 14, wherein step (c) is carried out in a stream of H₂ at a temperature in the range of from about 20 to about 200°C, for a period of time in the range of from about 0.5 to about 20 hours.
Claim 17
Dependent Claim
41 words
A process in accordance with claim 14, wherein said colloidal dispersion used in step (A) contains titania particles having an average particle diameter in the range of from about 1 to about 100 nanometers, and said liquid dispersion medium is water.
Claim 18
Dependent Claim
35 words
A process in accordance with claim 14, wherein the colloidal dispersion used in step (A) comprises about 0.1-50 weight percent TiO₂, and the TiO₂-coated material obtained in step (B) contains about 1-40 weight percent TiO₂.
Claim 19
Dependent Claim
41 words
A process in accordance with claim 14, wherein said porous ceramic material is monolith material, and said composition of matter comprises from about 0.5 to about 5 weight percent Pt, based on the weight of said catalyst composition excluding said monolith.
Claim 20
Dependent Claim
42 words
A process in accordance with claim 14, wherein said porous ceramic material is a monolith material, and said composition of matter comprises from about 0.5 to about 5 weight percent Pd, based on the weight of said composition matter excluding said monolith.
Claim 21
Dependent Claim
25 words
A process in accordance with claim 14, wherein said temperature in drying step (B) is in the range of from about 30 to about 200°C.
Claim 22
Dependent Claim
32 words
A process in accordance with claims 18 or 19, wherein said composition of matter, excluding said monolith material, contains about 0.2 to about 4 weight percent of said copromoter, expressed as metal.
Claim 23
Dependent Claim
51 words
A composition of matter, from which silica is substantially absent and which is useful and effective as a catalyst for CO oxidation, comprising titania and at least one noble metal selected form the group consisting of platinum and palladium, prepared by a process of any of the claims 1 to 21.
Claim 24
Dependent Claim
71 words
A process for oxidizing carbon monoxide comprising the step of: contacting a gas mixture comprising CO and O₂ with a catalyst composition, from which silica is substantially absent, comprising titania and at least one noble metal selected form the group consisting of platinum and palladium, under such reaction conditions as to at least partially convert said CO and O₂ to CO₂; wherein said catalyst composition is the composition of claim 22.
Claim 25
Dependent Claim
57 words
A process in accordance with claim 23, wherein said reaction conditions comprise a reaction temperature in the range of from about -50°C to about 400°C, a reaction pressure in the range of from about 1 to about 2,000 psia, and a volume ration of CO to O₂ in the range of from about 1:100 to about 100:1.
Claim 26
Dependent Claim
56 words
A process in accordance with claim 23, wherein said reaction conditions comprise a temperature in the range of from about -30°C to about 170°C, a reaction pressure in the range of from about 5 to about 20 psia, and a volume ratio of CO to O₂ in the range of from about 1:10 to about 10:1.
Claim 27
Dependent Claim
32 words
A process in accordance with claim 23, wherein said process is carried out in the cavity of a CO₂ laser so as to recombine CO and O₂ formed by dissociation of CO₂.
References Cited (Backward Citations)
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