Abstract
The effects of selected preparative variables on the performance of Cu/Co/Al/Zn catalysts during the conversion of synthesis gas to higher alcohols have been assessed. Using the Plackett-Burman statistical technique, the following order of importance has been observed for the preparation of dry (co-precipitated) precursors: ageing of precipitate > precipitation temperature > pH > total metal ion concentration > drying temperature. Samples prepared accordingly are comprised mainly of a crystalline hydrotalcite-type phase, but some amorphous malachite-type phase is also present. However, the degrees of crystallinity and homogeneity do not greatly influence the activity or selectivity of the calcined and reduced catalysts. It has become apparent that the thermal activation of the dry precursors is the single most important variable in the preparation of these catalysts. The importance of the degree of reduction of the various cobalt phases in determining the catalytic selectivity is discussed.
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