A Method To Produce Support For A Catalyst For Hydrocarbon Synthesis And A Method To Produce A Catalyst For Hydrocarbon Synthesis
Process for the preparation of extrudates suitable for use in the manufacture of catalysts or catalyst carriers, especially Fischer-Tropsch catalysts, comprising mulling a mixture of finely divided silica, a water soluble compound derived from a metal selected from group IVb of the Periodic Table and water, the mixture having a solids content of 20 to 50% by weight, and extruding the mixture. After drying and/or calcining, the extrudates may be impregnated with one or more suitable metal compounds, optionally followed by drying, calcination and/or activation, and used as a catalyst.
Essence of invention: A catalyst support for hydrocarbon synthesis is produced by co-milling of fine-grinded silica and water-soluble zirconium compound in the presence of water. The mixture contains 28-47 wt.% of solid components. During co-milling pH is kept equal to 8.7-9.5 by adding organic bases. Then pH is decreased to 8.3 by adding an organic acid. The mixture obtained is mixed with a surface-active additive and extruded, then dried and calcined. The used silica is either silica gel, or precipitated silica, or pyrogenic silica having an average particle size of 50 μm. Before using the silica is washed with a solution of ammonium carbonate. Ammonium-zirconium carbonate is used as the water-soluble zirconium compound. The zirconium content amounts to 8-15 wt.% of the silica content. To produce catalyst, the support is impregnated with an active component, dried and calcined.