| 简介 |
A method for preparing a copper-containing catalyst comprising : (a) combining an acidic copper-containing solution with a first basic precipitant solution in a first precipitation step to form a first precipitate, (b) combining an acidic aluminium-containing solution, further comprising one or more metal compounds selected from copper compounds, zinc compounds and promoter compounds, with a second basic precipitant solution in a second precipitation step to form a second precipitate, (c) contacting the first and second precipitates together in a further mixing step to form a catalyst precursor, and (d) washing, drying and calcining the catalyst precursor to form the copper-containing catalyst, wherein a silica precursor is included in the first precipitation step, the second precipitation step or the precipitate mixing step, to provide a catalyst with a silica content, expressed as SiO2, in the range of 0.1-5.0wt%. The promotor compounds may be selected from compounds of Mg, Co, Mn, V, Ti, Zr, or rare earths. The dried or calcined catalyst precursor can be shaped by pelleting. Preferably, the calcined catalyst comprises 30-70wt% CuO; 15-50wt% ZnO, 5-40wt% Al2O3, 0-5wt% MgO, and 0.1-2wt% SiO2. A catalyst and its use in methanol synthesis, methanol reforming and water-gas shift processes are also described. |
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