Isomerizations of n-pentane and n-hexane over cesium hydrogen salt of 12-tungstophosphoric acid promoted by platinum Original Research Article

Isomerizations of n-pentane and n-hexane were carried out in the presence of hydrogen over Cs2.5H0.5PW12O40 (Cs2.5) promoted with Pt by direct impregnation and mechanical mixing, and the results were compared with similarly Pt-promoted H-ZSM-5 and sulfated zirconia. The mechanical mixture of Pt/Al2O3 and Cs2.5 showed the highest stationary activity and selectivity and the least deactivation for both reactions at a relatively low temperature (453 K) and a low H2 pressure (pentane:H2:N2=0.05:0.05:0.9, hexane:H2:N2=0.05:0.2:0.75).