| abstract |
A method for the production of a Cu/Zn/Al catalyst, comprising copper oxide and zinc oxide as catalytically-effective substances and aluminium oxide as a thermostabilising substance is disclosed. Dissolved compounds, in particular, aluminium, copper and zinc salts are subjected to: a) a first precipitation with an alkaline solution or an alkaline aluminate/aluminium hydroxide sol, b) on completion of the precipitation, an aging of the first precipitate is carried out at approximately 20 DEG C to 100 DEG C, preferably 40 DEG C to 90 DEG C, over about 0 to 5 hours, c) in a second precipitation step, a solution of compounds of copper, zinc and optionally, aluminium, with a different Cu/Zn atomic ratio to step a), is added to the precipitate obtained in step b) along with an alkaline solution or an alkaline aluminate/aluminium hydroxide sol, d) an aging of the obtained second precipitate is carried out at about 20 DEG C to 100 DEG C, preferably 40 DEG C to 90 DEG C, over about 0.5 to 5 hours, e) the second precipitate obtained in step d) is separated from the solution and washed to remove alkaline ions and f) the washed second precipitate is then dried and subjected to a thermal treatment (calcination) at about 250 DEG C to 400 DEG C. |