Abstract
AbstractThe effect of promoting gamma‐alumina before and after calcination at 1130 K and silica‐alumina with 0.35% (w/w) Pt and/or 3.87% (w/w) Cl upon the selectivity of n‐heptane isomerisation was studied in a high pressure continuous flow reactor. Chlorination of Pt on γ‐alumina increased its catalytic activity but decreased its isomerisation selectivity, whereas chlorination of Pt on γ‐alumina calcined at 1130 K enhanced both activity and selectivity. Pt on silica‐alumina was the most active but the least selective among catalysts containing Pt plus Cl.The larger the surface area of a support, the larger the dispersion of Pt in it. Pt dispersion and distribution on the support increased markedly if impregnation was associated with chlorination. The isomerisation selectivity of a catalyst did not appear to depend on dispersion of platinum, whereas hydrocracking increased as dispersion increased.
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