| abstract |
The invention relates to a catalyst and a methodnon its manufacture for the production of vinyl acetate monomernby successively impregnating the supportnwith a basic solution and a gold and palladium saltsncontaining solution, the impregnationnat the same time or in succession, with or without intermediate dryingndone, washing the carrier for removalnany chloroid levels present and reducingnof the insoluble compounds precipitated on the carriernbefore or after washing, drying the thus obtainednCatalyst precursor and final impregnation withnAlkali acetate. Activity and selectivity of the catalyst,nits mechanical strength, the precious metal adhesion and thenPrecious metal dispersion on the carrier can be improvednif the carrier is in pretreatment with salts,nwhich are cations from the group zirconium and / ornTitanium and as anions elements of group VIIA orncomplex anions such as nitrate, sulfate or anionsncontain organic acids such as acetate and lactate,nimpregnated and then at temperatures ofnis dried and calcined at least 160 ° C. About thatnthe invention further relates to a catalyst and anProcess for its manufacture for the production ofnVinyl acetate monomer obtained by gas phase reductionnForming gas at temperatures between 350 and 550 ° Cnis available. |