ISOMERIZATION OF n-HEXANE ON Pd-CATALYSTS ON PILLARED ALUMINUM-ZIRCONIUM MONTMORILLONITE

Abstract

Pd-catalysts supported on pillared aluminum-zirconium Tagan (Kazakhstan) montmorillonite (??) from PdCl2 and Pd-sol were synthesized and their textural, acidic and catalytic properties in the isomerization of n-hexane were investigated, depending on content of the active metal and the temperature. It was shown that the activity and selectivity of Pd catalysts in the isomerization of n-hexane change little with decreasing of palladium content at different temperatures. On a 0.35% Pd-catalyst at 400°C, the content of C6 isomers is 46.0%, with a decrease of the palladium content to 0.1%, the isohexanes yield is 44.0% at a temperature of 350°C. The C6-isomers yield on the Pd-catalyst from sol is 47%, while on Pd it is 46%. A slightly increased isomerization activity of Pd-sol catalysts can be explained by a large number of average acid sites found on this catalyst as compared with the results obtained on the Pd-catalyst from PdCl2. The particle size of palladium in a 0.35% Pd/AlZrNaHMM +HM-catalyst found for two different areas of the catalyst varies from 2.7 to 5.2 nm.