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AssigneeHoechst Aktiengesellschaft
InventorsFriedrich Wunder, Therese Quadflieg, Gunter Roscher, Gunther Heck
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The carriers contain common active components, namely noble metals of the 8th sub-group or compounds thereof, and as activators alkali metal compounds, alkaline earth metal compounds or cadmium compounds. The carriers, too, consist of common materials, such as silicic acid. A novel feature is to be seen in the shape of the carrier particles which are designed as rod sections having a star-shaped cross section (FIGS. 1 to 7) or as ribbed rods (FIG. 8). In relation to the apparent density and thus in relation to the amount of noble metal employed, a considerably higher space-time yield is reached than with carrier particles of a conventional shape.
An improved catalyst for the preparation of vinyl acetate in the gaseous phase from ethylene, acetic acid and oxygen or oxygen-containing gases of the type containing as an active component a noble metal of subgroup VIII optionally in admixture with gold and/or a compound thereof and an activator of an alkali metal compound and/or an alkaline earth metal compound and/or a cadmium compound wherein said active component is applied onto a carrer, wherein the improvement comprises a carrier consisting essentially of either ribbed rods or rods with a star-shaped cross section.
Dependencies are inferred from the claim text.