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    REACTIVATING USED SILVER CATALYSTS
    41.
    发明专利
    REACTIVATING USED SILVER CATALYSTS 未知

    公开(公告)号：AU558162B2

    公开(公告)日：1987-01-22

    申请号：AU1764983

    申请日：1983-08-05

    Applicant: HOECHST AG

    Inventor： REBSDAT SIEGFRIED ,  MAYER SIGMUND ,  ALFRANSEDER JOSEF

    IPC: B01J23/66 ,  B01J23/96 ,  B01J38/48 ,  C07B61/00 ,  C07D301/10

    Abstract: A method for improving the activity of a used supported silver catalyst, used for the manufacture of ethylene oxide by reaction of ethylene with oxygen or air, which method consists essentially of: (a) impregnating said used catalyst at a temperature from 80 DEG C. to 150 DEG C. and for 0.75 hour to 10 hours with an impregnating solution containing water, a water-miscible organic solvent selected from the group consisting of methanol, ethanol, propanol, and isopropanol, at least one compound of cesium, rubidium, or of cesium and rubidium in an amount providing from 50 mg to 1000 mg per kilogram of solution, said solution containing from 5 to 50 percent by weight of water; (b) separating the impregnated catalyst from excess impregnating solution; and (c) drying the impregnated catalyst.

    46.
    发明专利
    未知

    公开(公告)号：BR8304218A

    公开(公告)日：1984-03-13

    申请号：BR8304218

    申请日：1983-08-05

    Applicant: HOECHST AG

    Inventor： REBSDAT SIEGFRIED ,  MAYER SEGMUND ,  ALFRANSEDER JOSEF

    IPC: B01J23/66 ,  B01J23/96 ,  B01J38/48 ,  C07B61/00 ,  C07D301/10 ,  C07D301/04

    Abstract: A method for improving the activity of a used supported silver catalyst, used for the manufacture of ethylene oxide by reaction of ethylene with oxygen or air, which method consists essentially of: (a) impregnating said used catalyst at a temperature from 80 DEG C. to 150 DEG C. and for 0.75 hour to 10 hours with an impregnating solution containing water, a water-miscible organic solvent selected from the group consisting of methanol, ethanol, propanol, and isopropanol, at least one compound of cesium, rubidium, or of cesium and rubidium in an amount providing from 50 mg to 1000 mg per kilogram of solution, said solution containing from 5 to 50 percent by weight of water; (b) separating the impregnated catalyst from excess impregnating solution; and (c) drying the impregnated catalyst.

    Silver catalysts, process for their preparation, and their use for the preparation of ethylene oxide
    48.
    发明专利
    Silver catalysts, process for their preparation, and their use for the preparation of ethylene oxide 未知

    公开(公告)号：DE3224323A1

    公开(公告)日：1984-01-05

    申请号：DE3224323

    申请日：1982-06-30

    Applicant: HOECHST AG

    Inventor： REBSDAT SIEGFRIED DR ,  MAYER SIGMUND DIPL ING ,  ALFRANSEDER JOSEF

    IPC: B01J23/66 ,  B01J37/02 ,  C07D301/10 ,  C07D303/04

    Abstract: The novel silver catalysts contain from 3 to 20% by weight of silver and from 0.003 to 0.05% by weight of potassium, rubidium, caesium or a mixture thereof as promoter on a heat-resistant, porous support material, percentages by weight in each case being based on the weight of the catalyst. They are prepared by applying the silver and the promoter to the support material by impregnation by means of solutions containing at least one silver compound and at least one promoter compound, where the entire amount of silver and only from 15 to 45% by weight of the entire amount of promoter are applied in a first impregnation step, the impregnated support material is heated in order to reduce the applied silver compound to metallic silver, and the remainder of the entire amount of promoter is applied in a second impregnation step.

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