PROCESS FOR THE PREPARATION OF CATALYSTS COMPRISING COPPER, ZINC, ALUMINIUM AND AT LEAST ONE OTHER METAL SELECTED FROM THE GROUP FORMED BY RARE EARTH METALS AND ZIRCONIUM, AND USE OF SUCH CATALYSTS IN REACTIONS OF A SYNTHESIS GAS

摘要

Manufacture of catalysts containing at least four essential metals: copper, zinc, aluminum and at least one metal selected from the group formed of rare earths and zirconium. The process comprises the formation of a crystallized precipitate of the above-mentioned metals by intimate mixture of a crystallized precipitate of copper, zinc and aluminum, containing less than 0.06% by weight of sodium after washing, with a precipitate of at least one metal of the rare earths group and/or zirconium, containing less than 3% of nitrogen after washing. The catalysts are used in balanced reactions involving alcohols and synthesis gases, and particularly for methanol synthesis.