I wanna make that sulfided catalyst from patent 5498585.
A) Preparing the catalyst precursor (Pt+H2O2)/C (without sulphidizing)
To prepare a catalyst with 3% platinum load, 97 g of activated carbon (dry weight) were stirred into distilled water with a stirring speed of 300 rpm. 12 g of a 25% strength aqueous solution of hexachloroplatinic acid hexahydrate (corresponding to 3 g of Pt) and 3 ml of a 30% strength aqueous solution of H2O2, corresponding to 2 moles of H2O2 per mole of platinum, were added to this suspension.
Then the suspension was heated to 80.degree. C. and sodium carbonate was added with continuous stirring, to precipitate barely soluble hydroxides. To reduce the precipitate, 1.8 ml of 37% strength formaldehyde solution was then added. The temperature of the suspension was also kept constant at 80.degree. C. during reduction. After reduction, the catalyst was filtered off on a nutsch filter and washed with DI water.
B) Preparing the sulphidized catalyst according to the invention (Pt+H2O2+S)/C.
To prepare a catalyst with a 3% platinum load according to the invention, a catalyst was first prepared in accordance with part A and then sulphidized with dimethyl sulphoxide in accordance with example 1 in DE-PS 21 50 220. The total sulphur content of the sulphidized catalyst was about 0.4 moles of S per mole of Pt.
Catalyst with the same platinum load but with double or four-fold the sulphur content were prepared by appropriately increasing the amount of sulphidizing agent.
Catalysts with different platinum loads were made up using the same procedure as above with a simultaneous increase in the amounts of hexachloroplatinic acid, caustic soda solution and sulphidizing agent.
DE-PS 21 50 220 is a patent very hard too get. Anybody knows what it says. I'm especially interested in example 1.
You've gotta love me.