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    Carrier catalyst, process for the production thereof, and use thereof for the preparation of vinyl acetate
    2.
    发明专利
    Carrier catalyst, process for the production thereof, and use thereof for the preparation of vinyl acetate 未知

    公开(公告)号：AU6748494A

    公开(公告)日：1995-01-27

    申请号：AU6748494

    申请日：1994-07-14

    Applicant: HOECHST AG

    Inventor： ABEL RONALD ,  WORNER KARL-FRED

    IPC: B01J23/52 ,  B01J23/58 ,  B01J23/60 ,  B01J37/02 ,  C07C67/055 ,  C07C69/15

    Abstract: The invention relates to Pd/K/Au, Pd/K/Ba and Pd/K/Cd supported catalysts constructed in a shell-shape, their production and their use for the preparation of vinyl acetate from ethylene, acetic acid and oxygen in the gas phase. The said catalysts are produced by impregnating the support particles with a solution of salts of the corresponding elements and then drying them, the dynamic viscosity of the solution being at least 0.003 Pa.s and the solution volume during impregnation being more than 80% of the pore volume of the support particles and the duration of impregnation and the time until the beginning of drying being selected to be short enough so that after drying is completed, a shell of 5% to 80% of the pore volume of the support particles contains the said metal salts.

    Carrier catalyst, process for the production thereof, and use thereof for the preparation of vinyl acetate
    4.
    发明专利
    Carrier catalyst, process for the production thereof, and use thereof for the preparation of vinyl acetate 未知

    公开(公告)号：AU678477B2

    公开(公告)日：1997-05-29

    申请号：AU6748494

    申请日：1994-07-14

    Applicant: HOECHST AG

    Inventor： ABEL RONALD ,  WORNER KARL-FRED

    IPC: B01J23/52 ,  B01J23/58 ,  B01J23/60 ,  B01J37/02 ,  C07C67/055 ,  C07C69/15 ,  B01J23/66

    Abstract: The invention relates to Pd/K/Au, Pd/K/Ba and Pd/K/Cd supported catalysts constructed in a shell-shape, their production and their use for the preparation of vinyl acetate from ethylene, acetic acid and oxygen in the gas phase. The said catalysts are produced by impregnating the support particles with a solution of salts of the corresponding elements and then drying them, the dynamic viscosity of the solution being at least 0.003 Pa.s and the solution volume during impregnation being more than 80% of the pore volume of the support particles and the duration of impregnation and the time until the beginning of drying being selected to be short enough so that after drying is completed, a shell of 5% to 80% of the pore volume of the support particles contains the said metal salts.

    Carrier catalyst, process for its preparation, and its use for the preparation of vinyl acetate
    7.
    发明专利
    Carrier catalyst, process for its preparation, and its use for the preparation of vinyl acetate 未知

    公开(公告)号：AU650142B2

    公开(公告)日：1994-06-09

    申请号：AU1835492

    申请日：1992-06-19

    Applicant: HOECHST AG

    Inventor： WIRTZ PETER ,  WORNER KARL-FRED ,  WUNDER FRIEDRICH ,  EICHLER KLAUS ,  ROSCHER GUNTER ,  NICOLAU IOAN

    IPC: B01J23/44 ,  B01J23/06 ,  B01J23/48 ,  B01J23/52 ,  B01J23/58 ,  B01J23/60 ,  B01J23/66 ,  B01J23/89 ,  B01J35/10 ,  B01J37/00 ,  B01J37/02 ,  C07B61/00 ,  C07C67/05 ,  C07C67/055 ,  C07C69/15 ,  B01J23/68 ,  B01J23/64 ,  B01J37/06

    Abstract: Prodn. of catalysts (I) involves (a) washing the ignited support particles with an acid which does not react with silica or alumina, until no more binder cations are washed out, (b) impregnating with Pd and Au or Cd, (c) contacting with a soln. of a base until there is no further change in the thickness of the noble metal layer produced on the particle surface and (d) impregnating with an alkali cpd. Catalyst contains Pd and/or Pd cpds. and alkali cpds., together with Cd cpds. and/or Au or Au cpds., on particles of a SiO2 or SiO2/Al2O3 substrate which is obtd. by pressing with the binder aid consisting of Li, Mg, Al, Zn, Fe and/or Mn 2-26C carboxylate(s), and igniting for 0.25-5 hrs. at 500-900 deg. C in oxgyen-contg. gas, to give a prod. with surface area 50-250 m2/g, pore vol. 0.4-1.2 ml/g and particle size 1-15mm, in which 5-20 vol. % of the pores have radius = 200-3000 Angstrom and 50-90 vol. % have radius = 70-100 Angstrom. Acid in (a) is pref. HCl, H2SO4, H3PO4 or HNO3, pref. HCl, the base in (c) is an alkali hydroxide, and a potassium cpd. is used in stage (d). Pref. (I) is obtd. by mixing glass microspheres (silica/alumina; at least 95 wt. % silica; obtd. by flame hydrolysis) with 10-20C Mg or Al carboxylate, pressing and igniting as above to give 5-7mm pellets, washing for 10-14 hours, with 10-20% HCl, drying impregnating with a soln. of PdCl2 and AuCl3 or Cd salt (chloride, nitrate etc.), precipitating with NaOH soln., impregnating with KOAc and drying; vinyl acetate prodn. is carried out at 120-200 deg. C and 1-20 bar, using a gas mixt. contg. not above 10 vol. % oxygen.

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