EP0085237A1
Expired / Lapsed
EP
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Catalysts for the production of alkylene oxides
Assignee: Imperial Chemical Industries Ltd
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Filing: 1982-12-08
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Granted: —
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Expires: 2002-12-08
Abstract
Abstract Catalysts for the oxidation of alkenes to alkylene oxides comprise silver on a porous heat resisting support which comprises at least 0.003 gram equivalents of rubidium and/or cesium chemically absorbed on the surface of the support per kilogram of the total catalyst.
Inventors
- 👤 Percy Hayden
- 👤 David William Johnson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 04:16
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/04; C07D301/08; C07D301/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
A catalyst for the production of an alkylene oxide by the oxidation of an alkene with oxygen which comprises silver on a porous heat resisting support which comprises at least 0.003 and preferably 0.008 to 0.016 gram equivalents of cesium and/or rubidium chemically absorbed on the surface of the support per kilogram of the total catalyst.
Claim 2
Dependent Claim
56 words
A catalyst for the production of an alkylene oxide by the oxidation of an alkene with oxygen which comprises silver on a porous heat resisting support which comprises at least 0.003 and preferably 0.008 to 0.016 gram equivalents of cesium and/or rubidium chemically absorbed on the surface of the support per kilogram of the total catalyst.
Claim 3
Dependent Claim
40 words
A catalyst as claimed in claim 1 or 2 in which the amount of cesium and/or rubidium chemically absorbed is in the range 400-3,000 parts per million of the total catalyst per square metre per gram of support surface area.
Claim 4
Dependent Claim
37 words
A catalyst as claimed in claim 1, 2 or 3 in which the catalyst support comprises alpha alumina in which at least 0.008 gram equivalents per square metre of support surface area of acidic sites are present.
Claim 5
Dependent Claim
54 words
A catalyst as claimed in claim 1, 2 or 3 in which the porous heat resisting support has a surface area of 1.0 to 5 square metres per gram as measured by a Brunauer Emmett and Teller method, an apparent porosity of 25 to 60% and mean pore diameter of 1.0 to 20 microns.
Claim 6
Dependent Claim
17 words
A catalyst as claimed in any preceding claim which comprises 5 to 15% by weight of silver.
Claim 7
Dependent Claim
41 words
A process for the production of a catalyst as claimed in any preceding claim in which the cesium and/or rubidium is introduced to the catalyst by exposing the catalyst and/or the support to an impregnating solution for at least 8 hours.
Claim 8
Dependent Claim
38 words
A process of producing a catalyst as claimed in any of claims 1, 2 or 3 in which the catalyst is contacted with a solution of a salt or cesium and/or rubidium which has a small dibasic anion.
Claim 9
Dependent Claim
42 words
A process of producing a catalyst as claimed in claim 1, 2 or 3 in which the catalyst is contacted with a solution of a cesium . and/or rubidium compound which comprises a lower alcohol together with a small quantity of water.
Claim 10
Dependent Claim
53 words
A process for producing a catalyst as claimed in any of claims 1 to 7 in which the rubidium and/or cesium are introduced to a catalyst which comprises silver metal which has been introduced by impregnating a support with a solution of a silver compound, and decomposing the silver compound to silver metal.
Claim 11
Dependent Claim
54 words
A process for the production of ethylene oxide which comprises oxidising the ethylene with oxygen in the presence of a catalyst as claimed in any of claims 1 to 8 or produced by a process as claimed in any of claims 6 to 9 and in the presence of a chlorine containing reaction modifier.
References Cited (Backward Citations)
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