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    IRON-MODIFIED BISMUTH PHOSPHOMOLYBDATE CATALYST
    4.
    发明专利
    IRON-MODIFIED BISMUTH PHOSPHOMOLYBDATE CATALYST 未知

    公开(公告)号：ZA704730B

    公开(公告)日：1971-06-30

    申请号：ZA704730

    申请日：1970-07-08

    Applicant: STANDARD OIL CO

    Inventor： DOMINIK J ,  PRESSON R ,  WYSOCKI C

    IPC: B01J23/88 ,  B01J27/192 ,  B01J ,  C01G

    Abstract: 1313191 Iron-containing bismuth phosphomolybdate catalysts STANDARD OIL CO 17 June 1970 [24 Sept 1969] 29366/70 Heading B1E Iron-containing carrier-supported bismuth phosphomolybdate catalyst is prepared by a process which comprises the sequential steps of comminuting carrier-supported bismuth phosphomolybdate material with sufficient water to form a paste, adding an aqueous solution of ammonium heptamolybdate to the paste to form a slurry, adding the slurry to a dispersion of silica in water acidified with phosphoric acid, -dispersing an iron salt in acid solution in the resulting slurry to form a homogeneous mixture, drying the mixture and calcining the resulting dried product at a temperature below the inactivation temperature of the resulting iron-containing catalyst. As exemplified, comminuting is effected by ball-milling, the iron salt used is ferric nitrate nonahydrate acidified with nitric acid, drying is effected by spray drying to form a microspheroidal product and calcining is effected at a temperature of 1260‹F. The carrier-supported bismuth phosphomolybdate material may be fresh, used, spent or depleted catalyst which is intended for use, or has been used, in the annoxidation of an α,#-monoolefin, for example propylene or isobutylene, to the corresponding unsaturated nitrile, for example acrylonitrile or methacrylonitrile.

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